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Noriaki Watanabe

Section

Graduate School of Environmental Studies

Job title

Professor

Degree

Ph.D. (Tohoku University)

researchmap

https://researchmap.jp/read0138601

J-GLOBAL ID

200901051157985860

Research History 5

2021/10 - Present

Tohoku University　Graduate School of Environmental Studies Department of Environmental Studies for Advanced Society　Professor
2014/04 - 2021/09

Tohoku University　Graduate School of Environmental Studies　Associate Professor
2007/11 - 2014/03

Tohoku University　Graduate School of Environmental Studies　Assistant Professor
2007/11 - 2011/10

Tohoku University　Graduate School of Environmental Studies　Research Assistant
2007/04 - 2007/10

Tohoku University　Graduate School of Environmental Studies　Postdoctoral Researcher

Education 3

Tohoku University　Graduate School of Environmental Studies　Doctoral Course, Department of Environmental Studies

2004/04 - 2007/03
Tohoku University　Graduate School of Environmental Studies　Master Course, Department of Environmental Studies

2002/04 - 2004/03
Tohoku University　Faculty of Engineering　Geo-engineering

1998/04 - 2002/03

Committee Memberships 2

6th International Workshop on Water Dynamics　大会実行委員

2009/01 - 2009/03
6th International Workshop on Water Dynamics　大会実行委員

2009/01 - 2009/03

Professional Memberships 4

資源素材学会
Geothermal Resources Council, USA
Japanease Association for Petroleum Technology
Geothermal Research Society of Japan

Research Interests 5

Soil and Rocks
CO2 storage
Oil and gas
Geothermal energy
Geofluid Dynamics

Research Areas 4

Environmental science/Agricultural science / Environmental load/risk assessment /
Environmental science/Agricultural science / Environmental dynamics /
Energy / Earth resource engineering, energy science /
Environmental science/Agricultural science / Environmental load reduction/restoration technology /

Awards 38

Outstanding Oral Presentation Award

2024/06　21st International Conference on Carbon Dioxide Utilization　Novel approach to CO2 capture, geological storage and mineralization using bio-based biodegradable chelating agents and seawater
論文賞

2024/06　一般社団法人岩の力学連合会　Laboratory hydraulic shearing of granitic fractures with surface roughness under stress states of EGS: Permeability changes and energy balance
優秀発表賞（銀賞）

2024/06　資源・素材学会東北支部　生分解性キレート剤を用いたCO2地中貯留・鉱物固定促進法の粘土鉱物を含有する玄武岩質火山性砂岩に対する有効性
優秀発表賞（銅賞）

2024/06　資源・素材学会東北支部　生分解性キレート剤を用いたCO2地中貯留・鉱物固定促進法における鉱物の加速溶解現象のモデル化
Best Presentation Award

2023/09　Japan Formation Evaluation Society　DISSOLUTION BEHAVIORS OF NATURALLY ALTERED BASALTS IN A BRINE AT 100°C FOR IN SITU CO2 MINERALIZATION
優秀発表賞（銅賞）

2023/06　資源・素材学会東北支部　地熱貯留層造成のための火山岩のCO2水押破砕
優秀発表賞（銅賞）

2023/06　資源・素材学会東北支部　火山岩地熱貯留層のCO2フラクチャリングシミュレーション
優秀発表賞（金賞）

2023/06　資源・素材学会東北支部　揮発性化学物質で汚染された土壌からの揮発フラックス挙動の定量解析
Paper Award

2023/06　Japanese Society for Rock Mechanics　Creating Cloud-Fracture Network by Flow-induced Microfracturing in Superhot Geothermal Environments
ORAL PRESENTATION AWARD

2022/12　Grand Renewable Energy 2022 International Conference　Hydraulic fracturing of granite in supercritical/superhot geothermal environments
社会地質学会奨励賞

2021/11　社会地質学会　データ駆動型解析による古津波堆積物の化学的特徴の解明
論文賞

2020/05　一般社団法人岩の力学連合会　Cloud-fracture networks as a means of accessing superhot geothermal energy
Tohoku University Distinguished Researcher

2020/04　Tohoku University　Characteristics of fluid flows in the Earth's crust and its applications to resource developments
資源・素材学会東北支部春季大会最優秀発表賞

2019/06　資源・素材学会東北支部　超臨界水圧破砕に及ぼす岩石の異方性の影響
Outstanding paper award

2019/05　Japanese Society for Rock Mechanics　Stress Buildup and Drop in Inland Shallow Crust Caused by the 2011 Tohoku-oki Earthquake Events
Grand Renewable Energy 2018 International Conference Best Presentation Award

2018/07　Grand Renewable Energy 2018　Utilization of geothermal hot spring water for hydrogen production by Al-H2O Hydrothermal Reaction
CO2 Sequestration with Multiple Energy Production: Enhanced Olivine Weathering in Self-heating Geothermal Reactor

2018/05
資源・素材学会東北支部春季大会ポスター賞（銀賞）

2018/05　資源・素材学会東北支部
41st Geothermal Resources Council Annual Meeting Best Geothermal Energy Presentation Award

2017/11/13　Geothermal Resources Council　Pressure Solution and Permeability Evolution in Fractured Granite at Elastic and Plastic Deformation Regimes
Outstanding Contribution in Reviewing

2017/03　ENGINEERING GEOLOGY
Outstanding Contribution in Reviewing

2016/11　JOURNAL OF HYDROLOGY
Outstanding Contribution in Reviewing

2016/10　JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
資源・素材学会東北支部春季大会ポスター賞（銀賞）

2016/07/07　一般社団法人資源・素材学会東北支部　X線CTを用いた土壌カラムにおける卓越流路の三次元可視化
資源・素材学会東北支部春季大会ポスター賞（銅賞）

2016/07/07　一般社団法人資源・素材学会東北支部　温度450℃，封圧30 MPaまでの条件における稲田花崗岩への水圧刺激
39th Geothermal Resources Council Annual Meeting Best Presentation Award

2015/09/23　39th Geothermal Resources Council Annual Meeting　Permeability Measurements of Fractured Granite at 350-450℃ under confining stress
資源・素材学会東北支部春季大会ポスター賞（金賞）

2015/06/17　資源・素材学会東北支部季大会　温度450℃，封圧90 MPa までの稲田花崗岩の透水特性
ISRM Outstanding Paper Award

2014/10　2014 ISRM International Symposium - 8th Asian Rock Mechanics Symposium　Changes In-Situ Rock Stress in the Kamaishi Mine Before and After the 2011 Tohoku-Oki Earthquake
Grand Renewable Energy 2014 International Conference Best Poster Presentation Award

2014/08/01　Grand Renewable Energy 2014 International Conference　Mechanical and hydraulic characteristics of a rock material under brittle-ductile transition
平成26年度科学技術分野の文部科学大臣表彰若手科学者賞

2014/04/07　文部科学省　卓越流路の形成をともなう地殻流体流動の予測に関する研究
Best Paper of the 19th Formation Evaluation Symposium 2013

2013/09　Japan Formation Evaluation Society　Oil-water relative permeability curves for fractures in granite and limestone at different intrinsic permeabilities
NPO法人環境エネルギー技術研究所第4回研究奨励賞

2013/03/22　NPO法人環境エネルギー技術研究所　地熱や廃熱による硫黄の水熱Redoxサイクルを通じたバイオマスからの水素製造
Best Paper of the 17th Formation Evaluation Symposium 2011

2011/09　Japan Formation Evaluation Society (Japan Chapter of Society of Petrophysicists and Well Log Analysts)　Evaluation and prediction of fluid flow through fracture under confining pressure in various scales
Best Paper of the 16th Formation Evaluation Symposium 2010

2010/10　Japan Formation Evaluation Society-A Chapter of SPWLA　Analysis of fracture flow within reservoir core sample under confining pressure by numerical modeling coupled with X-ray computed tomography
東北大学大学院環境科学研究科研究奨励賞

2009/10　東北大学大学院環境科学研究科
GRC Best Paper Award

2007/10　Geothermal Resources Council, USA　Evaluation of flow anisotropy within a simulated shear fracture under stress conditions from shallow to deep reservoirs
東北大学総長賞

2007/03　東北大学
GRC Best Poster Award

2006/10　Geothermal Resources Council, USA　Experimental evaluation of fluid flow through artificial shear fracture in granite
日本地熱学会ベストポスター賞

2002/11　日本地熱学会　岩石き裂内の熱水チャンネルフローとき裂間隙幅変化

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Papers 214

Creating multidirectional fractures through particle jamming Peer-reviewed

Yusuke Mukuhira, Ryota Goto, Noriaki Watanabe, Kazumasa Sueyoshi, Kohei Takuma, Rongchang Zhang, Tongfei Tian, Vladimir Sokolovski, Makoto Naoi, Yuko Arai, Takaaki Tomai, Masaoki Uno, Takatoshi Ito

International Journal of Rock Mechanics and Mining Sciences　188　106051-106051　2025/04
Publisher: Elsevier BV
DOI： 10.1016/j.ijrmms.2025.106051 　

ISSN： 1365-1609
Tensile Strength of WC-Ti(C,N)-Cr3C2-Co Ultrafine-Grained Cemented Carbide Peer-reviewed

Tomohiro Tsutsumi, Masayuki Takada, Sota Terasaka, Kiyotoshi Sakaguchi, Noriaki Watanabe, Hideaki Matsubara

MATERIALS TRANSACTIONS　2025
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-y2024011 　

ISSN： 1345-9678

eISSN： 1347-5320
Synergized Effects of Amino Acids and NaCl to Enhance Silicate Mineral Dissolution in Aqueous Environments for Efficient Atmospheric CO₂ Removal Peer-reviewed

Jiajie Wang, Sena Kikuchi, Noriyoshi Tsuchiya, Yoshinori Sato, Mei-Fang Chien, Noriaki Watanabe

Environmental Science & Technology　2024/12/02
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.est.4c07526 　

ISSN： 0013-936X

eISSN： 1520-5851
Applicability of monitoring data of Hg soil-atmosphere transport in an old mining area for exposure risk assessment Peer-reviewed

Monami Kondo, Jiajie Wang, Takeshi Komai, Noriaki Watanabe

Geochemistry: Exploration, Environment, Analysis　2024/11/19
Publisher: Geological Society of London
DOI： 10.1144/geochem2024-012 　

ISSN： 1467-7873

eISSN： 2041-4943

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Mercury (Hg) is a widespread pollutant that poses significant risks to both ecosystems and human health. While previous studies have evaluated Hg concentrations in soils, few have measured Hg emissions in areas with high Hg concentrations or related these measurements to estimates of exposure via air inhalation based on Hg flux values. This study addresses this gap by proposing the use of gaseous elemental Hg (GEM) flux measurements for exposure risk assessments, with a particular focus on the importance of inhalation exposure, which has implications for future risk management strategies. Sensitivity analysis of the site-specific exposure and risk estimation model revealed that the fraction of land area in surface water significantly impacted the estimated exposure through air inhalation. Additionally, the analysis showed that the GEM flux measured in situ in a high-Hg concentration area of Itomuka was not directly proportional to the Hg concentration, although the risk estimation model treated it as a function of concentration. Furthermore, we found that the flux values are influenced by both the fraction of land area in surface water and Hg concentration, indicating that this new flux-based indicator should be integrated into exposure risk assessments.
CO ₂ capture, geological storage, and mineralization using biobased biodegradable chelating agents and seawater Peer-reviewed

Jiajie Wang, Ryota Sekiai, Ryota Tamura, Noriaki Watanabe

Science Advances　10　(46)　2024/11/15
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/sciadv.adq0515 　

eISSN： 2375-2548

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Geological storage and mineralization of CO ₂ in mafic/ultramafic reservoirs faces challenges including limited effective porosity, permeability, and rock reactivity; difficulties in using seawater for CO ₂ capture; and uncontrolled carbonation. This study introduces a CO ₂ capture, storage, and mineralization approach with the utilization of biobased biodegradable chelating agents and seawater. An acidic chelating agent solution is used to increase effective porosity and permeability through enhanced mineral dissolution. For instance, applying an acidic N , N -Bis(carboxymethyl)- L -glutamate solution to a porous basalt increased effective porosity by 16% and permeability by 26-fold in 120 hours. Subsequently, alkaline chelating agent–containing seawater improves CO ₂ capture and storage by inhibiting mineralization, thus maintaining injectivity while providing ions for mineralization and further expanding storage space. Last, controlled mineralization is achieved by adjusting chelating agent biodegradation. Promising CO ₂ storage and mineralization capacities two orders higher than current techniques, this approach reduces required reservoir volume while enhancing efficiency.
Tensile Strength of WC-Ti(C,N)-Cr3C2-Co Ultrafine-grained Cemented Carbide Peer-reviewed

Tomohiro TSUTSUMI, Masayuki TAKADA, Sota TERASAKA, Kiyotoshi SAKAGUCHI, Noriaki WATANABE, Hideaki MATSUBARA

Journal of the Japan Society of Powder and Powder Metallurgy　71　(9)　409-415　2024/09/15
Publisher: Japan Society of Powder and Powder Metallurgy
DOI： 10.2497/jjspm.24-00043 　

ISSN： 0532-8799

eISSN： 1880-9014
Characteristics and effectiveness of water-assisted CO2 fracturing for creating geothermal reservoirs in volcanic rocks Peer-reviewed

Eko Pramudyo, Kohei Takuma, Yuto Watanabe, Kiyotoshi Sakaguchi, Yutaro Maeda, Sho Ogata, Kazumasa Sueyoshi, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe

Geoenergy Science and Engineering　213280-213280　2024/09
Publisher: Elsevier BV
DOI： 10.1016/j.geoen.2024.213280 　

ISSN： 2949-8910
CO2 fracturing of volcanic rocks under geothermal conditions: Characteristics and process Peer-reviewed

Kohei Takuma, Yutaro Maeda, Yuto Watanabe, Sho Ogata, Kiyotoshi Sakaguchi, Eko Pramudyo, Daisuke Fukuda, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe

Geothermics　120　103007-103007　2024/06
Publisher: Elsevier BV
DOI： 10.1016/j.geothermics.2024.103007 　

ISSN： 0375-6505
Maximizing permeability of fractured volcanic rocks through chelating-agent-assisted and pH-controlled selective mineral dissolution Peer-reviewed

Luis Salalá, Jonathan Argueta, Jiajie Wang, Noriaki Watanabe, Noriyoshi Tsuchiya

Geothermics　119　102949-102949　2024/05
Publisher: Elsevier BV
DOI： 10.1016/j.geothermics.2024.102949 　

ISSN： 0375-6505
A sustainable temperature-swing process for CO2 capture and mineralization at below 100 °C using a recyclable chelating agent and bottom ash Peer-reviewed

Jiajie Wang, Yusuke Maeda, Vani Novita Alviani, Shoichi Kumon, Kimitaka Sato, Noriyoshi Tsuchiya, Noriaki Watanabe

Journal of Environmental Chemical Engineering　12　(2)　112301-112301　2024/04
Publisher: Elsevier BV
DOI： 10.1016/j.jece.2024.112301 　

ISSN： 2213-3437
Permeability enhancement by CO2 injection and chelating agent stimulation for creating geothermal reservoirs in granite Peer-reviewed

Eko Pramudyo, Luis Salalá, Ryota Goto, Jiajie Wang, Kazumasa Sueyoshi, Lena Muhl, Kiyotoshi Sakaguchi, Noriaki Watanabe

Geoenergy Science and Engineering　234　212586-212586　2024/03
Publisher: Elsevier BV
DOI： 10.1016/j.geoen.2023.212586 　

ISSN： 2949-8910
Characteristics of congruent dissolution of silicate minerals enhanced by chelating ligand under ambient conditions Peer-reviewed

Jiajie Wang, Astin Nurdiana, Yoshinori Sato, Noriaki Watanabe, Noriyoshi Tsuchiya

American Mineralogist　2024/02/01
Publisher: Mineralogical Society of America
DOI： 10.2138/am-2023-9025 　

ISSN： 0003-004X

eISSN： 1945-3027
Multi-layered physical factors govern mercury release from soil: Implications for predicting the environmental fate of mercury Peer-reviewed

Monami Kondo, Anna Korre, Takeshi Komai, Noriaki Watanabe

Journal of Environmental Management　352　120024-120024　2024/02
Publisher: Elsevier BV
DOI： 10.1016/j.jenvman.2024.120024 　

ISSN： 0301-4797
Reactivity and Dissolution Characteristics of Naturally Altered Basalt in CO₂-Rich Brine: Implications for CO₂ Mineralization Peer-reviewed

Jiajie Wang, Masahiko Yagi, Tetsuya Tamagawa, Hitomi Hirano, Noriaki Watanabe

ACS Omega　2024/01/17
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acsomega.3c06899 　

ISSN： 2470-1343

eISSN： 2470-1343
Clarification of Generation Mechanism of Volatilization Flux based on Detailed Analysis of Transport Phenomena near the Ground Surface and Quantitative Evaluation of Influencing Factors Peer-reviewed

Monami Kondo, Yasuhide Sakamoto, Junko Hara, Takeshi Komai, Noriaki Watanabe

Journal of Hazardous Materials　133356　in press　2023/12

DOI： 10.1016/j.jhazmat.2023.133356 　
Machine Learning-based Geochemical Discrimination Method for Tsunami Deposits and a Simple Determination System Invited Peer-reviewed

Shuta SATO, Takeshi KOMAI, Kengo NAKAMURA, Noriaki WATANABE

Journal of Geography (Chigaku Zasshi)　132　(5)　385-402　2023/10/25
Publisher: Tokyo Geographical Society
DOI： 10.5026/jgeography.132.385 　

ISSN： 0022-135X

eISSN： 1884-0884
Carbon dioxide (CO2) fracturing of volcanic rocks under geothermal conditions Peer-reviewed

Kohei Takuma, Yuto Watanabe, Kiyotoshi Sakaguchi, Noriaki Watanabe, Kazumi Osato, Amane Terai

Proceedings of 15th ISRM Congress 2023 & 72nd Geomechanics Colloquium　221-226　2023/10
Laboratory hydraulic shearing of granitic fractures with surface roughness under stress states of EGS: Permeability changes and energy balance Peer-reviewed

Takuya Ishibashi, Hiroshi Asanuma, Yusuke Mukuhira, Noriaki Watanabe

International Journal of Rock Mechanics and Mining Sciences　170　105512-105512　2023/10
Publisher: Elsevier BV
DOI： 10.1016/j.ijrmms.2023.105512 　

ISSN： 1365-1609
DISSOLUTION BEHAVIORS OF NATURALLY ALTERED BASALTS IN A BRINE AT 100 °C FOR IN-SITU CO2 MINERALIZATION Peer-reviewed

Jiajie Wang, Noriaki Watanabe, Masahiko Yagi, Tetsuya Tamagawa, Hitomi Hirano

Proceedings of the 28th Formation Evaluation Symposium of Japan　Paper C　2023/09
WATER-ASSISTED CO2 FRACTURING OF VOLCANIC ROCKS UNDER GEOTHERMAL CONDITIONS Peer-reviewed

Kohei Takuma, Yuto Watanabe, Kiyotoshi Sakaguchi, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe

Proceedings of the 28th Formation Evaluation Symposium of Japan　Paper B　2023/09
Numerical Analysis on the Effect of Soil Properties on the Generation of Volatilization Flux from Unsaturated Soil Contaminated by Volatile Chemical Substances Peer-reviewed

Monami Kondo, Yasuhide Sakamoto, Yoshishige Kawabe, Takeshi Komai, Noriaki Watanabe

Environmental Modeling and Assessment　23　09914-09914　2023/07/11
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10666-023-09914-0 　

ISSN： 1420-2026

eISSN： 1573-2967
Process and optimum pH for permeability enhancement of fractured granite through selective mineral dissolution by chelating agent flooding International-journal Peer-reviewed

Ryota Takahashi, Jiajie Wang, Noriaki Watanabe

Geothermics　109　102646-102646　2023/03
Publisher: Elsevier BV
DOI： 10.1016/j.geothermics.2022.102646 　

ISSN： 0375-6505
Prediction of 1,4-Dioxane Migration in Groundwater and Evaluation of Remediation Measures in an Illegal Dumping Site Using a 2D-Numerical Model Peer-reviewed

Thatthep Pongritsakda, Yasuhide Sakamoto, Jiajie Wang, Yoshishige Kawabe, Sanya Sirivithayapakorn, Takeshi Komai, Noriaki Watanabe

Sustainability　15　(5)　3930-3930　2023/02/21
Publisher: MDPI AG
DOI： 10.3390/su15053930 　

eISSN： 2071-1050

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Illegal dumping sites are usually characterized by complex contamination situations due to the presence of multiple contamination sources. To improve the efficiency of illegal waste dumping site remediation, this study developed a numerical model considering the effects of groundwater levels and hydraulic gradient changes on remediation operations. Using this model, the most likely sources of contamination for 1,4-dioxane at an illegal waste site in Iwate Prefecture, Japan, were successfully identified (including location, amount, and time of occurrence) by reproducing historical monitoring data (from 2010 to 2022) through history matching, and future contaminant migration in groundwater was predicted. In addition, based on quantitative evaluations of the remediation measures, we found that some remediation measures, such as impermeable wall construction, while having some effects on the control of contamination spreading, may accelerate the migration of contaminants off-site due to the change of hydraulic gradient. Therefore, remediation procedures should be more carefully considered for illegal dumping sites based on an understanding of the distribution of contamination sources and hydraulic gradient evolutions.
NaHCO3 as a carrier of CO2 and its enhancement effect on mineralization during hydrothermal alteration of basalt Peer-reviewed

Sena Kikuchi, Jiajie Wang, Otgonbayar Dandar, Masaoki Uno, Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

Frontiers in Environmental Science　11　2023/02/15
Publisher: Frontiers Media SA
DOI： 10.3389/fenvs.2023.1138007 　

eISSN： 2296-665X

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Reaction of carbon dioxide (CO₂) with minerals to generate stable carbonates, also known as CO₂ mineralization, has been regarded as one of the most promising methods for safe and permanent carbon storage. As a promising feedstock, basaltic rock has gained special interest, and elevating basalt carbonation efficiency with the reduction of negative environmental impact is the main challenge for CO₂ mineralization system development. Considering multiple potential positive effects of the CO₂ carrier, NaHCO₃, we conducted this study to experimentally evaluate the CO₂ storage efficiency during water-basalt-NaHCO₃ interactions under hydrothermal conditions at 200–300°C. The inclusion of NaHCO₃ was confirmed to drastically promote the alteration of basalt, especially at higher temperatures. As revealed by experiments conducted at the saturated vapor pressure of water, the carbon storage efficiency at 300°C reached 75 g/kg of basalt in 5 days, which was 12 times higher than that at 200°C. In such hydrothermal systems, basalt was carbonated to generate calcite (CaCO₃), where the Ca was mainly from plagioclase; Mg and Fe were incorporated into smectite, and Na in the saline system participated in the formation of Na silicates (i.e., analcime in the case of basalt). Due to the presence of additional Na in solution, all the released elements were consumed quickly with generation of secondary minerals in turn promoted basalt dissolution to release more Ca for CO₂ storage. This study illuminated the role of NaHCO₃ in basalt carbonation and provided technical backup to the design of advanced CO₂ mineralization systems.
Permeability enhancement and void formation by chelating agent in volcanic rocks (Ahuachapán and Berlín geothermal fields, El Salvador) International-journal International-coauthorship Peer-reviewed

Luis Salalá, Ryota Takahashi, Jonathan Argueta, Jiajie Wang, Noriaki Watanabe, Noriyoshi Tsuchiya

Geothermics　107　102586-102586　2023/01
Publisher: Elsevier BV
DOI： 10.1016/j.geothermics.2022.102586 　

ISSN： 0375-6505
CO2 Injection-Induced Shearing and Fracturing in Naturally Fractured Conventional and Superhot Geothermal Environments International-journal Peer-reviewed

Eko Pramudyo, Ryota Goto, Kiyotoshi Sakaguchi, Kengo Nakamura, Noriaki Watanabe

Rock Mechanics and Rock Engineering　2022/12/13
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s00603-022-03153-7 　

ISSN： 0723-2632

eISSN： 1434-453X

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Abstract This study elucidates the possibility of CO₂ injection-induced formation of a complex cloud-fracture network (CFN) in granite, along with shearing (shear slip) of natural pre-existing fractures under conventional (~ 150–300 °C) and superhot (> ~ 400 °C) geothermal conditions, potentially providing additional connecting flow paths between the stimulated natural fractures. Here, we conduct a set of experiments under triaxial stress states at 150 °C and 450 °C on cylindrical granite samples containing a sawcut (representing a natural fracture) inclined 45° from the sample’s axis. CO₂ injection induced dynamic shear slip on the sawcut, with higher slip velocities at 150 °C owing to the higher elasticity of the rock than that at 450 °C. The lower viscosity of CO₂ also allowed it to more uniformly pressurize the sawcut, resulting in higher slip velocities and slip displacements compared with those based on water injection in the 150 °C experiments. This implies that under conventional geothermal conditions, CO₂ injection can stimulate the same volume of rock as that of water injection at lower injection-well pressures. The CFNs then formed via CO₂ injection at pressures similar to those predicted by the Griffith failure criterion as the sawcut shear slip progressed at both experimental temperatures. The experiments also revealed potential challenges associated with CO₂ injection in naturally fractured geothermal environments, such as narrow aperture CFNs, owing to decreasing differential stress during their formation; all these factors should be addressed in future research.
Effectiveness and characteristics of atmospheric CO2 removal in croplands via enhanced weathering of industrial Ca-rich silicate byproducts Peer-reviewed

Rina Yoshioka, Kengo Nakamura, Ryota Sekiai, Jiajie Wang, Noriaki Watanabe

Frontiers in Environmental Science　10　1068656　2022/11/25
Publisher: Frontiers Media SA
DOI： 10.3389/fenvs.2022.1068656 　

eISSN： 2296-665X

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Enhanced weathering of industrial Ca-rich silicate byproducts in croplands is potentially profitable for large-scale atmospheric CO₂ removal; during the weathering process, CO₂ dissolves to form HCO₃⁻ and CO₃²⁻ in alkaline soil pore water, which eventually flows into the ocean. However, the effectiveness of such systems is still in doubt, owing to the unrealistic models used for prediction and the insufficient consideration of the dynamic influences of soils on fluid chemistry. We determined the effectiveness of such systems for atmospheric CO₂ removal, along with their characteristics, through a set of batch- and flow-through-type laboratory experiments, using andosol and decomposed granite soil as agricultural and non-agricultural soils, respectively, and Portland cement, steelmaking slag, and coal fly ash as industrial byproducts. The results of the batch-type experiments demonstrated that agricultural soils were suitable for CO₂ removal, owing to their moderately high pH and Ca concentrations in pore water that prevented intensive calcium carbonate precipitation. The flow-through experiments demonstrated that a higher Ca-content byproduct can have a large atmospheric CO₂ removal capacity. However, the magnitude of CO₂ removal and its time-dependent behavior were difficult to predict because they were not in conjunction with the changes in the average pH value. This indicated that the diffusive transport of CO₂ from the atmosphere-soil interface to deeper soils was more complex than expected. Maximizing CO₂ removal requires a better understanding of the diffusive transport of CO₂ through gas-filled pore spaces, created by unsteady-state air–water two-phase flow, due to intermittent rainfall.
Influence of non-uniform flow on toxic elements transport in soil column percolation test Peer-reviewed

Kyouhei Tsuchida, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

Heliyon　8　(11)　e11541-e11541　2022/11
Publisher: Elsevier BV
DOI： 10.1016/j.heliyon.2022.e11541 　

ISSN： 2405-8440
A numerical study on the creation of artificial supercritical geothermal reservoirs by hydraulic fracturing International-journal Peer-reviewed

Kimio Watanabe, Norihiro Watanabe, Noriaki Watanabe, Kiyotoshi Sakaguchi, Masaatsu Aichi, Hisanao Ouchi, Hiroshi Asanuma

Geothermics　105　102500-102500　2022/11
Publisher: Elsevier BV
DOI： 10.1016/j.geothermics.2022.102500 　

ISSN： 0375-6505
QUANTITATIVE PREDICTION MODEL OF VOLATILIZATION FLUX GENERATION FROM UNSATURATED SOIL―VERIFICATION BASED ON HISTORY MATCHING PROCESS OF SOIL COLUMN TEST― Peer-reviewed

Monami KONDO, Yasuhide SAKAMOTO, Yoshishige KAWABE, Kengo NAKAMURA, Noriaki WATANABE, Takeshi KOMAI

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)　78　(3)　87-103　2022/07
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejer.78.3_87 　

eISSN： 2185-6648
Erratum to “CO<inf>2</inf> injection-induced complex cloud-fracture networks in granite at conventional and superhot geothermal conditions” [Geothermics 97 (2021) 102265] (Geothermics (2021) 97, (S0375650521002224), (10.1016/j.geothermics.2021.102265))

Eko Pramudyo, Ryota Goto, Noriaki Watanabe, Kiyotoshi Sakaguchi, Kengo Nakamura, Takeshi Komai

Geothermics　101　2022/05

DOI： 10.1016/j.geothermics.2021.102340 　

ISSN： 0375-6505
Role of water in unexpectedly large changes in emission flux of volatile organic compounds in soils under dynamic temperature conditions International-journal Peer-reviewed

Asma Akter Parlin, Monami Kondo, Noriaki Watanabe, Kengo Nakamura, Jiajie Wang, Yasuhide Sakamoto, Takeshi Komai

Scientific Reports　12　(1)　4418　2022/03
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-022-08270-5 　

eISSN： 2045-2322

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Abstract Understanding the diffusive transport behavior of volatile organic compounds (VOCs) in near-surface soils is important because soil VOC emissions affect atmospheric conditions and climate. Previous studies have suggested that temperature changes affect the transport behavior; however, the effect of these changes are poorly understood. Indeed, under dynamic temperature conditions, the change in VOC flux is much larger than that expected from the temperature dependency of the diffusion coefficient of VOCs in air. However, the mechanism is not well understood, although water in soil has been considered to play an important role. Here, we present the results of experiments for the upward vertical vapor-phase diffusive transport of two VOCs (benzene and tetrachloroethylene) in sandy soil under sinusoidal temperature variations of 20–30 °C, as well as its numerical representation. The results clarify that the unexpectedly large changes in emission flux can occur as a result of changes in the VOC concentration gradient due to VOC release (volatilization) from/trapping (dissolution) into water, and that such flux changes may occur in various environments. This study suggests the importance of a global evaluation of soil VOC emissions by continuous measurements in various soil environments and/or predictions through numerical simulations with thorough consideration of the role of water in dynamic soil environments.
Potentially toxic elements pose significant and long‑term human health risks in river basin districts with abandoned gold mines International-journal Peer-reviewed

Arie Pujiwati, Kengo Nakamura, Jiajie Wang, Yoshishige Kawabe, Noriaki Watanabe, Takeshi Komai

Environmental Geochemistry and Health　2022/03
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10653-022-01229-5 　

ISSN： 0269-4042

eISSN： 1573-2983
A geochemical approach for source apportionment and environmental impact assessment of heavy metals in a Cu–Ni mining region, Botswana Peer-reviewed

Fiona Motswaiso, Jiajie Wang, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

Environmental Earth Sciences　81　(5)　2022/03
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s12665-021-10158-y 　

ISSN： 1866-6280

eISSN： 1866-6299
Sustainable process for enhanced CO2 mineralization of calcium silicates using a recyclable chelating agent under alkaline conditions International-journal Peer-reviewed

Jiajie Wang, Noriaki Watanabe, Kosuke Inomoto, Masanobu Kamitakahara, Kengo Nakamura, Takeshi Komai, Noriyoshi Tsuchiya

Journal of Environmental Chemical Engineering　10　(1)　107055-107055　2022/02
Publisher: Elsevier BV
DOI： 10.1016/j.jece.2021.107055 　

ISSN： 2213-3437
Amygdaloidal globe clusters in meta-tuffs from the Akizawa Formation of the Cambrian Hitachi Volcanic-Plutonic Complex Peer-reviewed

M. Tagiri, K. Hanawa, A. Oikawa, N. Watanabe, H. Ando

Bulletin of Ibaraki Nature Museum　24　1-17　2021/12
Wellbore stability in high-temperature granite under true triaxial stress International-journal International-coauthorship Peer-reviewed

R. Goto, K. Sakaguchi, F. Parisio, K. Yoshioka, E. Pramudyo, N. Watanabe

Geothermics　100　102334-102334　2021/12
Publisher: Elsevier BV
DOI： 10.1016/j.geothermics.2021.102334 　

ISSN： 0375-6505
A laboratory study of hydraulic fracturing at the brittle-ductile transition International-journal International-coauthorship Peer-reviewed

Francesco Parisio, Keita Yoshioka, Kiyotoshi Sakaguchi, Ryota Goto, Takahiro Miura, Eko Pramudyo, Takuya Ishibashi, Noriaki Watanabe

Scientific Reports　11　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-01388-y 　

eISSN： 2045-2322

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<title>Abstract</title>Developing high-enthalpy geothermal systems requires a sufficiently permeable formation to extract energy through fluid circulation. Injection experiments above water’s critical point have shown that fluid flow can generate a network of highly conductive tensile cracks. However, what remains unclear is the role played by fluid and solid rheology on the formation of a dense crack network. The decrease of fluid viscosity with temperature and the thermally activated visco-plasticity in rock are expected to change the deformation mechanisms and could prevent the formation of fractures. To isolate the solid rheological effects from the fluid ones and the associated poromechanics, we devise a hydro-fracture experimental program in a non-porous material, polymethyl methacrylate (PMMA). In the brittle regime, we observe rotating cracks and complex fracture patterns if a non-uniform stress distribution is introduced in the samples. We observe an increase of ductility with temperature, hampering the propagation of hydraulic fractures close to the glass transition temperature of PMMA, which acts as a limit for brittle fracture propagation. Above the glass transition temperature, acoustic emission energy drops of several orders of magnitude. Our findings provide a helpful guidance for future studies of hydro-fracturing of supercritical geothermal systems.
Fracturing of granite rock with supercritical water for superhot geothermal resources International-journal Peer-reviewed

Bailong Liu, Anna Suzuki, Noriaki Watanabe, Takuya Ishibashi, Kiyotoshi Sakaguchi, Takatoshi Ito

Renewable Energy　184　56-67　2021/11
Publisher: Elsevier BV
DOI： 10.1016/j.renene.2021.11.062 　

ISSN： 0960-1481
Development of a model for predicting the volatilization flux from unsaturated soil contaminated by volatile chemical substances International-journal Peer-reviewed

M. Kondo, Y. Sakamoto, Y. Kawabe, K. Nakamura, N. Watanabe, T. Komai

Environmental Modeling & Assessment　2021/10
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10666-021-09796-0 　

ISSN： 1420-2026

eISSN： 1573-2967

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<title>Abstract</title>This work developed a model for predicting the volatilization flux from the unsaturated soil contaminated by volatile chemical substances (VCSs) such as mercury and benzene. The model considers a series of phenomena under the unsaturated condition such as multi-phase flow consisting of a non-aqueous phase liquid, water, and gases together with the permeation of rainfall into the surface soil, the volatilization/condensation of VCSs, and the adsorption/desorption of VCSs. On this basis, this work clarified a mechanism for the generation of a volatilization flux at the ground surface. In addition, the effects of various transport phenomena in the surface soil on the magnitude and seasonal changes in this flux due to variations in weather factors such as rainfall level, temperature, and air pressure were quantitatively evaluated. This newly developed prediction model can be utilized to estimate dynamic variations in the flux under real-environmental conditions.
CO2 injection-induced complex cloud-fracture networks in granite at conventional and superhot geothermal conditions Peer-reviewed

Eko Pramudyo, Ryota Goto, Noriaki Watanabe, Kiyotoshi Sakaguchi, Kengo Nakamura, Takeshi Komai

Geothermics　97　102265　2021/10
Prediction and remediation of groundwater pollution in a dynamic and complex hydrologic environment of an illegal waste dumping site Peer-reviewed

Thatthep Pongritsakda, Kengo Nakamura, Jiajie Wang, Noriaki Watanabe, Takeshi Komai

Applied Sciences　11　(19)　9229-9229　2021/10
Publisher: MDPI AG
DOI： 10.3390/app11199229 　

eISSN： 2076-3417

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The characteristics of groundwater pollution caused by illegal waste dumping and methods for predicting and remediating it are still poorly understood. Serious 1,4-dioxane groundwater pollution—which has multiple sources—has been occurring at an illegal waste dumping site in the Tohoku region of Japan. So far, anti-pollution countermeasures have been taken including the installation of an impermeable wall and the excavation of soils and waste as well as the monitoring of contamination concentrations. The objective of this numerical study was to clarify the possibility of predicting pollutant transport in such dynamic and complex hydrologic environments, and to investigate the characteristics of pollutant transport under both naturally occurring and artificially induced groundwater flow (i.e., pumping for remediation). We first tried to reproduce the changes in 1,4-dioxane concentrations in groundwater observed in monitoring wells using a quasi-3D flow and transport simulation considering the multiple sources and spatiotemporal changes in hydrologic conditions. Consequently, we were able to reproduce the long-term trends of concentration changes in each monitoring well. With the predicted pollutant distribution, we conducted simulations for remediation such as pollutant removal using pumping wells. The results of the prediction and remediation simulations revealed the highly complex nature of 1,4-dioxane transport in the dumping site under both naturally occurring and artificially induced groundwater flows. The present study suggests possibilities for the prediction and remediation of pollution at illegal waste dumping sites, but further extensive studies are encouraged for better prediction and remediation.
Novel chemical stimulation for geothermal reservoirs by chelating agent driven selective mineral dissolution in fractured rocks Peer-reviewed

N. Watanabe, K. Takahashi, R. Takahashi, K. Nakamura, Y. Kumano, K. Akaku, T. Tamagawa, T. Komai

Scientific Reports　11　(1)　19994　2021/10
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-99511-6 　

eISSN： 2045-2322

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<title>Abstract</title>Improving geothermal systems through hydraulic stimulation to create highly permeable fractured rocks can induce seismicity. Therefore, the technique must be applied at a moderate intensity; this has led to concerns of insufficient permeability enhancement. Adding chemical stimulation can mitigate these issues, but traditional methods using strong mineral acids have challenges in terms of achieving mineral dissolution over long distances and highly variable fluid chemistry. Here, we demonstrate a novel chemical stimulation method for improving the permeability of rock fractures using a chelating agent that substantially enhances the dissolution rate of specific minerals to create voids that are sustained under crustal stress without the challenges associated with the traditional methods. Applying this agent to fractured granite samples under confining stress at 200 °C in conjunction with 20 wt% aqueous solutions of sodium salts of environmentally friendly chelating agents (<italic>N</italic>-(2-hydroxyethyl)ethylenediamine-<italic>N</italic>, <italic>N</italic>′, <italic>N</italic>′-triacetic acid and <italic>N, N</italic>-bis(carboxymethyl)-<sc>l</sc>-glutamic acid) at pH 4 was assessed. A significant permeability enhancement of up to approximately sixfold was observed within 2 h, primarily due to the formation of voids based on the selective dissolution of biotite. These results demonstrate a new approach for chemical stimulation.
Flow-Induced Microfracturing of Granite in Conventional and Superhot Geothermal Environments International-journal Peer-reviewed

Goto, Ryota, Pramudyo, Eko, Watanabe, Noriaki, Sakaguchi, Kiyotoshi, Chen, Youqing, Takeshi Komai

Paper presented at the SPWLA 26th Formation Evaluation Symposium of Japan, Virtual, September 2021　SPWLA-JFES-2021-K　2021/09
Permeability Enhancement by Selective Mineral Dissolution of Rocks in Geothermal Environments International-journal Peer-reviewed

Salalá, Luis, Takahashi, Ryota, Watanabe, Noriaki, Nakamura, Kengo, Tsuchiya, Noriyoshi, Takeshi Komai

Paper presented at the SPWLA 26th Formation Evaluation Symposium of Japan, Virtual, September 2021　SPWLA-JFES-2021-J　2021/09
Dynamic evaluation method for planning sustainable landfills using GIS and multi-criteria in areas of urban sprawl with land-use conflicts International-journal Peer-reviewed

Chelsea Langa, Junko Hara, Jiajie Wang, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

PLOS ONE　16　(8)　e0254441-e0254441　2021/08/27
Publisher: Public Library of Science (PLoS)
DOI： 10.1371/journal.pone.0254441 　

eISSN： 1932-6203

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Landfill site selection is problematic in many countries, especially developing nations where there is rapid population growth, which leads to high levels of inadequate waste disposal. To find sustainable landfill sites in sprawling cities, this study presents an approach that combines geographic information system (GIS) with multi-criteria (social, environmental and, technical criteria) and the population growth projection. The greater Maputo area in Mozambique was selected as a representative city for the study, which is undergoing rapid urbanization. Six criteria, i.e., land use, transport networks, hydrology, conservation reserve, geology and slope, were considered and overlaid in the GIS using an analytic hierarchy process (AHP). The arithmetic projection of the population trend suggests that the greater Maputo area is experiencing a rapid and uncontrolled population growth, especially in Matola city. These pronounced changes in population then significantly change the landfill placement decision making. Dynamic and static scenarios were created, based on the analysis of multi-criteria and the areas likely to undergo future increased population growth. A comparative evaluation in a scenario of dynamic behavior considering future population showed that suitable areas for landfill sites have been drastically modified due to social and environmental factors affected by population distribution in some regions. The results indicate that some suitable areas can generate land use conflicts due to population growth with unplanned land use expansion. Finally, the western part of Matola city is recognized as the most recommendable landfill site, which can serve both Maputo and Matola city with affordable costs. This study provides an effective landfill placement decision making approach, which is possible to be applied anywhere, especially in developing countries to improve sustainable municipal solid waste management systems.
Enhancement of aragonite mineralization with a chelating agent for CO2 storage and utilization at low to moderate temperatures International-journal Peer-reviewed

Jiajie Wang, Noriaki Watanabe, Kosuke Inomoto, Masanobu Kamitakahara, Kengo Nakamura, Takeshi Komai, Noriyoshi Tsuchiya

Scientific Reports　11　(1)　13956　2021/07
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-93550-9 　

eISSN： 2045-2322

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<title>Abstract</title>Among the CaCO₃ polymorphs, aragonite demonstrates a better performance as a filler material in the paper and plastic industries. Despite being ideal from the environmental protection perspective, the production of aragonite particles via CO₂ mineralization of rocks is hindered by the difficulty in achieving high production efficiencies and purities, which, however, can be mitigated by exploiting the potential ability of chelating agents on metal ions extraction and carbonation controlling. Herein, chelating agent <italic>N,N</italic>-dicarboxymethyl glutamic acid (GLDA) was used to enhance the extraction of Ca from calcium silicate and facilitate the production of aragonite particles during the subsequent Ca carbonation. CO₂ mineralization was promoted in the presence of 0.01–0.1 M GLDA at ≤ 80 °C, with the maximal CaCO₃ production efficiency reached 308 g/kg of calcium silicate in 60 min using 0.03 M GLDA, which is 15.5 times higher than that without GLDA. In addition, GLDA showed excellent effects on promoting aragonite precipitation, e.g., the content of aragonite was only 5.1% in the absence of GLDA at 50 °C, whereas highly pure (> 90%, increased by a factor of 18) and morphologically uniform aragonite was obtained using ≥ 0.05 M GLDA under identical conditions. Aragonite particle morphologies could also be controlled by varying the GLDA concentration and carbonation temperature. This study proposed a carbon-negative aragonite production method, demonstrated the possibility of enhanced and controlled aragonite particle production during the CO₂ mineralization of calcium silicates in the presence of chelating agents.
Water-Enhanced Flux Changes under Dynamic Temperatures in the Vertical Vapor-Phase Diffusive Transport of Volatile Organic Compounds in Near-Surface Soil Environments Peer-reviewed

Asma Akter Parlin, Monami Kondo, Noriaki Watanabe, Kengo Nakamura, Mizuki Yamada, Jiajie Wang, Takeshi Komai

Sustainability　13　(12)　6570-6570　2021/06/09
Publisher: MDPI AG
DOI： 10.3390/su13126570 　

eISSN： 2071-1050

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The quantitative understanding of the transport behavior of volatile organic compounds (VOCs) in near-surface soils is highly important in light of the potential impacts of soil VOC emissions on the air quality and climate. Previous studies have suggested that temperature changes affect the transport behavior; however, the effects are not well understood. Indeed, much larger changes in the VOC flux under in situ dynamic temperatures than those expected from the temperature dependence of the diffusion coefficients of VOCs in the air have been suggested but rarely investigated experimentally. Here, we present the results of a set of experiments on the upward vertical vapor-phase diffusive transport of benzene and trichloroethylene (TCE) in sandy soils with water contents ranging from an air-dried value to 10 wt% during sinusoidal temperature variation between 20 and 30 °C. In all experiments, the flux from the soil surface was correlated with the temperature, as expected. However, the changes in flux under wet conditions were unexpectedly large and increased with increasing water content; they were also larger for TCE, the volatility of which depended more strongly on the temperature. Additionally, the larger flux changes were accompanied by a recently discovered water-induced inverse correlation between temperature and flux into the overlying soil. These results demonstrated that the flux changes of VOCs under dynamic temperatures could be increased by volatilization-dissolution interactions of VOCs with water. Future extensive studies on this newly discovered phenomenon would contribute to a better understanding of the impacts of soil VOC emissions on the air quality and climate.
Water‐induced inverse correlation between temperature and flux changes in vertical vapor‐phase diffusive transport of volatile organic compounds in near‐surface soil environments International-journal Peer-reviewed

Parlin, A.A, Watanabe, N, Nakamura, K, Yamada, M, Wang, J, Komai, T

Applied Sciences　11　(8)　3489-3489　2021/04
Publisher: MDPI AG
DOI： 10.3390/app11083489 　

eISSN： 2076-3417

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Volatile organic compounds (VOCs) in contaminated soils have been investigated in near-surface environments to describe their transport behaviors and the resultant impacts of vapor intrusion into buildings. Prior studies have suggested that temperature changes significantly influence such transport behaviors in near-surface soils; however, the nature of these influences and their mechanisms have remained unclear. This is because an inverse correlation between the in situ temperature and VOC flux changes has been suggested but has not been experimentally investigated or demonstrated. Herein, we show the results of a set of experiments on the vertical and upward vapor-phase diffusive transport of benzene in sandy soils for different sand grain size and water content combinations under sinusoidal temperature changes between 20 and 30 °C. Under all experimental conditions, changes in the flux from the soil surface correlated with temperature changes, whereas changes in the flux into the overlying soil showed inverse correlations. Concurrent monitoring of the relative humidity revealed that an inverse correlation was exhibited in response to the condensation and volatilization of water. Moreover, the intensity of the inverse correlation was independent of grain size but was larger at higher water contents. Overall, water in soil may induce an inverse correlation.
Local initiative hydrogen production by utilization of aluminum waste materials and natural acidic hot-spring water International-journal Peer-reviewed

Vani Novita Alviani, Nobuo Hirano, Noriaki Watanabe, Masahiro Oba, Masaoki Uno, Noriyoshi Tsuchiya

Applied Energy　293　116909-116909　2021
Publisher: Elsevier BV
DOI： 10.1016/j.apenergy.2021.116909 　

ISSN： 0306-2619
Formation of amorphous silica nanoparticles and its impact on permeability of fractured granite in superhot geothermal environments International-journal Peer-reviewed

N. Watanabe, H. Abe, A. Okamoto, K. Nakamura, T. Komai

Scientific Reports　11　(1)　Article number: 5340　2021
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-84744-2 　

eISSN： 2045-2322

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<title>Abstract</title>Superhot geothermal environments in granitic crusts of approximately 400–500 °C are a frontier of geothermal energy. In the development of such environments, there is a concern of a reduction of permeability of fractured granite due to the formation of fine particles of amorphous silica induced by the phase change from subcritical water to supercritical water or superheated steam. However, the formation of silica particles and a resultant reduction in permeability have not been demonstrated to date. Therefore, experiments were conducted on the formation of amorphous silica particles with various combinations of temperature (430–500 °C) and pressure (20–30 MPa), in which the phase change of Si-containing water from liquid to either supercritical fluid or vapor was induced. Amorphous silica nanoparticles occurred under all conditions with smaller particles for higher temperature. The permeability of fractured granite was also observed to decrease significantly within several hours during injection of the particles into rock at 450 °C and 30 MPa under a confining stress of 40 MPa, with slower permeability reduction at a smaller number of particles or in the presence of larger aperture fractures. The present study suggests that the nanoparticles are likely to form and destroy the permeability in superhot geothermal environments, against which countermeasures should be investigated.
Creating cloud-fracture network by flow-induced microfracturing in superhot geothermal environments International-journal International-coauthorship Peer-reviewed

R. Goto, N. Watanabe, K. Sakaguchi, T. Miura, Y. Cheng, T. Ishibashi, E. Pramudyo, F. Parisio, K. Yoshioka, K. Nakamura, T. Komai, N. Tsuchiya

Rock Mechanics and Rock Engineering　54　(6)　2959-2974　2021
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s00603-021-02416-z 　

ISSN： 0723-2632

eISSN： 1434-453X
Data-driven analysis for source apportionment and geochemical backgrounds establishment of toxic elements and REEs in the Tohoku region, Japan Peer-reviewed

A.Pujiwati, J.Wang, K. Nakamura, Y. Kawabe, N. Watanabe, T. Komai

Chemosphere　263　128268-128268　2021/01
Publisher: Elsevier BV
DOI： 10.1016/j.chemosphere.2020.128268 　

ISSN： 0045-6535
Injection-induced Slip Characteristics of a Tensile Rock Fracture under High Temperatures Peer-reviewed

S. Takeyama, R. Goto, N. Watanabe, K. Sakaguchi, N. Tsuchiya

Journal of the Geothermal Research Society of Japan　43　(2)　53-64　2021
Regional landfill planning for improvement of waste management in Maputo, Mozambique Peer-reviewed

Chelsea Langa, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

Advances In Natural And Applied Sciences　14　(3)　89-95　2020/12

DOI： 10.22587/anas.2020.14.3.12 　
Characteristics of hydrogen production with carbon storage by CO2-rich hydrothermal alteration of olivine in the presence of Mg-Al spinel Peer-reviewed

Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　45　(24)　13163-13175　2020/05

DOI： 10.1016/j.ijhydene.2020.03.032 　

ISSN： 0360-3199

eISSN： 1879-3487
Hydromechanical properties of 3D printed fractures with controlled surface roughness: Insights into shear-permeability coupling processes International-journal International-coauthorship Peer-reviewed

T. Ishibashi, Y. Fang, D. Elsworth, N. Watanabe, H. Asanuma

International Journal of Rock Mechanics and Mining Sciences　128　104271　2020/03

DOI： 10.1016/j.ijrmms.2020.104271 　

ISSN： 1365-1609
Stabilizing and enhancing permeability for sustainable and profitable energy extraction from superhot geothermal environments Peer-reviewed

Noriaki Watanabe, Kohei Saito, Atsushi Okamoto, Kengo Nakamura, Takuya Ishibashi, Hanae Saishu, Takeshi Komai, Noriyoshi Tsuchiya

APPLIED ENERGY　260　114306　2020/02

DOI： 10.1016/j.apenergy.2019.114306 　

ISSN： 0306-2619

eISSN： 1872-9118
Supercritical carbon dioxide fracturing of granite from conventional to superhot geothermal conditions Peer-reviewed

Eko Pramudyo, Noriaki Watanabe, Sho Takeyama, Ryota Goto, Takahiro Miura, Kohki Hattori, Kiyotoshi Sakaguchi, Takeshi Komai

SPWLA 25th Formation Evaluation Symposium of Japan, JFES 2019　SPWLA-JFES-2019-E　2020
Fracture and permeability of granite in superhot geothermal environments Invited Peer-reviewed

N. Watanabe, K. Sakaguchi, H. Saishu, R. Goto, T. Ishibashi, A. Okamoto, Y. Chen, S.E. Ingebritsen, T. Komai, N. Tsuchiya

Proceedings of the YSRM2019 & REIF2019　Paper number KL4　2019/12
Permeability change of granite fracture due to the pressurized water injection under high stress condition in laboratory Peer-reviewed

T. Ishibashi, H. Asanuma, N. Watanabe

Proceedings of the YSRM2019 & REIF2019　Paper number 1-2-6　2019/12
Mechanisms and possible applications of the Al-H2O reaction under extreme pH and low hydrothermal temperatures Peer-reviewed

Alviani, Vani Novita, Setiani, Putri, Uno, Masaoki, Oba, Masahiro, Hirano, Nobuo, Watanabe, Noriaki, Tsuchiya, Noriyoshi, Saishu, Hanae

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　44　(57)　29903-29921　2019/11

DOI： 10.1016/j.ijhydene.2019.09.152 　

ISSN： 0360-3199

eISSN： 1879-3487
Pyroxene control of H-2 production and carbon storage during water-peridotite-CO2 hydrothermal reactions Peer-reviewed

Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　44　(49)　26835-26847　2019/10

DOI： 10.1016/j.ijhydene.2019.08.161 　

ISSN： 0360-3199

eISSN： 1879-3487
Utilization of geothermal hot spring water for hydrogen production Peer-reviewed

Vani Novita Alviani, Takuya Kosaka, Masaoki Uno, Masahiro Oba, Nobuo Hirano, Noriaki Watanabe, Noriyoshi Tsuchiya, Hanae Saishu

Journal of the Geothermal Research Society of Japan　41　(3)　101-107　2019/07

DOI： 10.11367/grsj.41.101 　

ISSN： 0388-6735

eISSN： 1883-5775
Geochemical Investigation of Metals and Trace Elements around the Abandoned Cu-Ni Mine Site in Selibe Phikwe, Botswana Peer-reviewed

Fiona S. Motswaiso, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

Journal of Geoscience and Environment Protection　7　(5)　275-293　2019/06

DOI： 10.4236/gep.2019.75020 　
Acceleration of hydrogen production during water-olivine-CO2 reactions via high-temperature-facilitated Fe(II) release Peer-reviewed

Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　44　(23)　11514-11524　2019/05

DOI： 10.1016/j.ijhydene.2019.03.119 　

ISSN： 0360-3199

eISSN： 1879-3487
NaHCO3-promoted olivine weathering with H2 generation and CO2 sequestration in alkaline hydrothermal system Peer-reviewed

J Wang, K Nakamura, N Watanabe, A Okamoto, T Komai

Earth and Environmental Science　257　(012017)　1-7　2019/03
Mechanical Behavior and Permeability of Simulated Rock with Single Fracture under Brittle and Ductile Conditions Peer-reviewed

S. Takeyama, K. Sakaguchi, N. Watanabe, N. Tsuchiya

Journal of MMIJ　135　(3)　25-30　2019/03

DOI： 10.2473/journalofmmij.135.25 　
Construction of a conceptual model for confined groundwater flow in the Gunii Khooloi Basin, Southern Gobi Region, Mongolia Peer-reviewed

B. Bayanzul, K. Nakamura, I. Machida, N. Watanabe, T. Komai

Hydrogeology Journal　27　(5)　1581-1596　2019/03

DOI： 10.1007/s10040-019-01955-8 　

ISSN： 1431-2174

eISSN： 1435-0157
Enhanced hydrogen production with carbon storage by olivine alteration in CO2-rich hydrothermal environments Peer-reviewed

Jiajie Wang, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai

JOURNAL OF CO2 UTILIZATION　30　205-213　2019/03

DOI： 10.1016/j.jcou.2019.02.008 　

ISSN： 2212-9820

eISSN： 2212-9839
Three-dimensional channeling flow within subsurface rock fracture networks suggested via fluid flow analysis in the yufutsu fractured oil/gas reservoir Peer-reviewed

Ishibashi, T., Watanabe, N., Tamagawa, T., Tsuchiya, N.

Journal of Petroleum Science and Engineering　178　838-851　2019

DOI： 10.1016/j.petrol.2019.04.003 　
Cloud-fracture networks as a means of accessing superhot geothermal energy Peer-reviewed

N. Watanabe, K. Sakaguchi, R. Goto, T. Miura, K. Yamane, T. Ishibashi, Y. Chen, T. Komai, N. Tsuchiya

Scientific Reports　9　(1)　Article number: 939　2019/01
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-018-37634-z 　

eISSN： 2045-2322
Local non-vuggy modeling and relations among porosity, permeability and preferential flow for vuggy carbonates Peer-reviewed

Watanabe, N., Kusanagi, H., Shimazu, T., Yagi, M.

Engineering Geology　248　(8)　197-206　2019/01

DOI： 10.1016/j.enggeo.2018.11.016 　
Contributions of 3D Printed Fracture Networks to Development of Flow and Transport Models Peer-reviewed

Suzuki, A., Minto, J.M., Watanabe, N., Li, K., Horne, R.N.

Transport in Porous Media　129　(2)　2019

DOI： 10.1007/s11242-018-1154-7 　
Hydrogeological Investigation on Shallow and Deep Groundwater in the Southern Gobi Desert, Mongolia

BAYANZUL Batdemberel, BAYANZUL Batdemberel, MACHIDA Isao, NAKAMURA Kengo, WATANABE Noriaki, KOMAI Takeshi

Proceedings of Symposium on Geo-Environments and Geo-Technics　28th　71‐76　2018/12/07

ISSN： 0917-7183
Concurrent monitoring of hydraulic and mechanical properties of granite fracture during hydraulically induced shearing in laboratory Peer-reviewed

T. Ishibashi, H. Asanuma, S. Ishikawa, N. Watanabe

Proceedings 52nd US Rock Mechanics / Geomechanics Symposium　ARMA 18–369　2018/06
Mechanisms and kinetic model of hydrogen production in the hydrothermal treatment of waste aluminum Peer-reviewed

Putri Setiani, Noriaki Watanabe, Rina Riana Sondari, Noriyoshi Tsuchiya

Materials for Renewable and Sustainable Energy　7　(2)　7: 10　2018/05/01
Publisher: SpringerOpen
DOI： 10.1007/s40243-018-0118-8 　

ISSN： 2194-1467 2194-1459
Application of multivariate analysis to investigate the trace element contamination in top soil of coal mining district in Jorong, South Kalimantan, Indonesia Peer-reviewed

Arie Pujiwati, K. Nakamura, N. Watanabe, T. Komai

IOP Conference Series: Earth and Environmental Science　118　(1)　2018/02/22
Publisher: Institute of Physics Publishing
DOI： 10.1088/1755-1315/118/1/012062 　

ISSN： 1755-1315 1755-1307

eISSN： 1755-1315
Status of Japanese Supercritical Geothermal Project as of FY2017 Peer-reviewed

Asanuma,.H, Mogi, T, Tsuchiya, N, Watanabe,. N, Naganawa, S, Ogawa, Y, Fujimitsu, Y, Kajiwara, T, Osato, K, Shimada, K, Horimoto, S, Sato, T, Ito, T, Yamada, S, Watanabe, K, Gotoh, Y, Nagasawa, Y, Kohyama, A

Geothermal Resources Council Transactions　42　2018
Simultaneous olivine alteration and carbonation in CO2-rich geological condition Peer-reviewed

Jiajie Wang, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

Proceedings of the International Offshore and Polar Engineering Conference　2018-June　244-250　2018/01/01

ISSN： 1098-6189

eISSN： 1555-1792
Friction-Stability-Permeability Evolution of a Fracture in Granite Peer-reviewed

Ishibashi, T., Elsworth, D., Fang, Y., Riviere, J., Madara, B., Asanuma, H., Watanabe, N., Marone, C.

Water Resources Research　54　(12)　9901-9918　2018

DOI： 10.1029/2018WR022598 　
Experimental investigation on changes in mechanical properties of volcanic sandstones under CO<inf>2</inf> geological storage conditions Peer-reviewed

Koki Hattori, Noriaki Watanabe, Atsushi Okamoto, Kengo Nakamura, Takeshi Komai, Tetsuya Tamagawa

ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018　ARMS10-P-0133　2018
Injection-induced slip characteristics of a rock fracture under high temperatures Peer-reviewed

S. Takeyama, H. Yamane, N. Watanabe, K. Sakachuchi

Proceedings of 10th Asiam Rock Mechanics Symposium　ARMS10-P-0176　2018
Utilization of geothermal hot spring water for hydrogen production by Al-H2O hydrothermal reaction Peer-reviewed

V. Alviani, T. Kosaka, M. Uno, M. Oba, N. Hirano, N. Watanabe, N. Tsuchiya, H. Saishu

GRAND RENEWABLE ENERGY 2018 Proceedings　41　(3)　O-Ge-2-3-107　2018

DOI： 10.11367/grsj.41.101 　

ISSN： 0388-6735

eISSN： 1883-5775
AE measurement during hydraulic fracturing of Inada granite at 400oC via the novel true triaxial system at Tohoku University Peer-reviewed

R. Goto, T. Ishibashi, K. Yamane, T. Miura, N. Watanabe, K. Sakaguchi, N. Tsuchiya

GRAND RENEWABLE ENERGY 2018 Proceedings　O-Ge-6-4　2018
Fluid Pocket Generation in Response to Heterogeneous Reactivity of a Rock Fracture Under Hydrothermal Conditions Peer-reviewed

A. Okamoto, H. Tanaka, N. Watanabe, H. Saishu, N. Tsuchiya

GEOPHYSICAL RESEARCH LETTERS　44　(20)　10306-10315　2017/10

DOI： 10.1002/2017GL075476 　

ISSN： 0094-8276

eISSN： 1944-8007
Hydraulic fracturing in granite at subcritical/brittle to supercritical/ductile conditions Peer-reviewed

T. Ishibashi, N. Watanabe, K. Sakaguchi, N. Tsuchiya

GRC Transactions　41　910-919　2017/10
Total and Leachable Concentration of Trace Elements in Soil towards Human Health Risk, Related with Coal Mine in Jorong, South Kalimantan, Indonesia Peer-reviewed

Arie Pujiwati, Kengo Nakamura, Noriaki Watanabe, Takeshi Komai

International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering　11　(10)　820-828　2017/09/10
Stress buildup and drop in inland shallow crust caused by the 2011 Tohoku-oki earthquake events Peer-reviewed

Kiyotoshi Sakaguchi, Tatsuya Yokoyama, Weiren Lin, Noriaki Watanabe

SCIENTIFIC REPORTS　7　10242　2017/08

DOI： 10.1038/s41598-017-10897-8 　

ISSN： 2045-2322
Fracture network created by 3-D printer and its validation using CT images Peer-reviewed

Anna Suzuki, Noriaki Watanabe, Kewen Li, Roland N. Horne

WATER RESOURCES RESEARCH　53　(7)　6330-6339　2017/07

DOI： 10.1002/2017WR021032 　

ISSN： 0043-1397

eISSN： 1944-7973
Hydraulic fracturing and permeability enhancement in granite from subcritical/brittle to supercritical/ductile conditions Peer-reviewed

Noriaki Watanabe, Motoki Egawa, Kiyotoshi Sakaguchi, Takuya Ishibashi, Noriyoshi Tsuchiya

GEOPHYSICAL RESEARCH LETTERS　44　(11)　5468-5475　2017/06

DOI： 10.1002/2017GL073898 　

ISSN： 0094-8276

eISSN： 1944-8007
Potentially exploitable supercritical geothermal resources in the ductile crust Peer-reviewed

Noriaki Watanabe, Tatsuya Numakura, Kiyotoshi Sakaguchi, Hanae Saishu, Atsushi Okamoto, Steven E. Ingebritsen, Noriyoshi Tsuchiya

NATURE GEOSCIENCE　10　(2)　140-+　2017/02

DOI： 10.1038/NGEO2879 　

ISSN： 1752-0894

eISSN： 1752-0908
The effect of reaction heat by acid injection for enhanced gas recovery from methane hydrate reservoir Peer-reviewed

Fuyuki Kaneko, Kengo Nakamura, Yasuhide Sakamoto, Noriaki Watanabe, Takeshi Komai

23rd Formation Evaluation Symposium of Japan 2017　2017/01/01
Empirical studies of the hydrogen generation system by using hot springs water and waste aluminum Peer-reviewed

Hanae Saishu, Takuya Kosaka, Noriyoshi Tsuchiya, Noriaki Watanabe

Journal of the Geothermal Research Society of Japan　39　(1)　15-24　2017
Publisher: Geothermal Research Society of Japan
DOI： 10.11367/grsj.39.15 　

ISSN： 1883-5775 0388-6735
Pressure solution and permeability evolution in fractured granite at elastic and plastic deformation regimes Peer-reviewed

Kohei Saito, Noriaki Watanabe, Atsushi Okamoto, Noriyoshi Tsuchiya, Takuya Ishibashi, Hanae Saishu

Transactions - Geothermal Resources Council　41　945-955　2017

ISSN： 0193-5933
nu-X-type relative permeability curves for steam-water two-phase flows in fractured geothermal reservoirs Peer-reviewed

Noriaki Watanabe, Takuma Kikuchi, Takuya Ishibashi, Noriyoshi Tsuchiya

GEOTHERMICS　65　269-279　2017/01

DOI： 10.1016/j.geothermics.2016.10.005 　

ISSN： 0375-6505

eISSN： 1879-3576
Stress dependency of permeability in high temperature fractured granite Peer-reviewed

N. Watanabe, M. Egawa, K. Sakaguchi

Proceedings of the 9th Asian Rock Mechanics Symposium　PO14-P50　2016/10
Hydraulic fracturing in Inada granite under brittle-ductile condition Peer-reviewed

M. Egawa, N. Watanabe, K. Sakaguchi

Proceedings of the 9th Asian Rock Mechanics Symposium　PO16-P66　2016/10
Relative permeability curves for two-phase flows through heterogeneous vuggy carbonates Peer-reviewed

H. Kusanagi, N. Watanabe, T. Shimazu, M. Yagi

Proceedings of the 22nd Formation Evaluation Symposium of Japan　Paper F　2016/09/29
Linking microearthquakes to fracture permeability change: The role of surface roughness Peer-reviewed

Takuya Ishibashi, Noriaki Watanabe, Hiroshi Asanuma, Noriyoshi Tsuchiya

GEOPHYSICAL RESEARCH LETTERS　43　(14)　7486-7493　2016/07

DOI： 10.1002/2016GL069478 　

ISSN： 0094-8276

eISSN： 1944-8007
Evaluation of prosity distributions within packed soil columns with X-ray CT based 3-D visualization Peer-reviewed

K. Nakamura, T. Aoki, N. Watanabe, T. Komai

土木学会論文集C（地圏工学）　72　(2)　190-195　2016/06/20
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejge.72.190 　

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 The purpose of this paper is to examine the soil structure and flow path in order to standardize an upflow column test using an X-ray CT based numerical analysis. The soil structure and flow path are visualized of a porosity distribution by the X-ray CT. Methods of filling sample to the inside column were used ‘Free fall method’ and ‘Water tightening method’. Porosity of the Water tightening method, sample was maintained 35%-40% before and after in wet condition. And the porosity distribution is confirmed that uniforms and not to change removable with water flow. It is suggested that fluid flux in porosity distributions is stabile in the column. On the other hand, Porosity of the Free fall method, sample was observed that is increased 5% before and after water flow and the chap is occurred before water flow between layers. The porosity distribution is confirmed unevenness forms which have layers and part of large and small pores in the column. These unequal porosity distribution are thought that fluid flux has become spiro-flow and changed flow variation with time. It is revealed that the porosity distribution is significantly different due to differences in the soil filling method even same soil sample. It is considered that most important for standardization and generalization of column test methods and results is understood phenomenon (fluid flux, transport and response) resulting due to porosity distribution and consolidated reproducible test method for radical soil porosity distribute in the column.
Linking microearthquakes to fracture permeability evolution Invited Peer-reviewed

Ishibashi, T., Watanabe, N., Asanuma, H., Tsuchiya, N.

Crustal Permeability　49-64　2016

DOI： 10.1002/9781119166573.ch7 　
Permeability-porosity relation and preferential flow in heterogeneous vuggy carbonates Peer-reviewed

H. Kusanagi, N. Watanabe, T. Shimazu, M. Yagi

Proceedings of the 21st Formation Evaluation Symposium of Japan　Paper E　2015/10
Permeability measurements of fractured granite at 350-450 °C under confining stress Peer-reviewed

T. Numakura, N. Watanabe, K. Sakaguchi, T. Kikuchi, N. Tsuchiya

GRC Transactions　39　329-334　2015/09
Numerical simulation of gas hydrate bearing sediments for enhanced recovery using partial oxidation method Peer-reviewed

T. Komai, Y. Sakamoto, A. Kishita, N. Watanabe

Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference　69-72　2015/06
New v-type relative permeability curves for two-phase flows through subsurface fractures Peer-reviewed

Noriaki Watanabe, Keisuke Sakurai, Takuya Ishibashi, Yutaka Ohsaki, Tetsuya Tamagawa, Masahiko Yagi, Noriyoshi Tsuchiya

WATER RESOURCES RESEARCH　51　(4)　2807-2824　2015/04

DOI： 10.1002/2014WR016515 　

ISSN： 0043-1397

eISSN： 1944-7973
Predicting the channeling flows through fractures at various scales Peer-reviewed

N. Watanabe, T. Ishibashi, N. Tsuchiya

Proceedings World Geothermal Congress 2015　paper number 15015　2015/04
Mapping the preferential flow paths within a fractured reservoir Peer-reviewed

T. Ishibashi, N. Watanabe, T. Tamagawa, N. Tsuchiya

Proceedings World Geothermal Congress 2015　paper number15018　2015/04
Fundamental Study for Beyond Brittle Geothermal Reservoirs Peer-reviewed

N. Tsuchiya, H. Asanuma, A. Okamoto, K. Sakaguchi, N. Hirano, A. Kizaki, N. Watanabe

Proceedings World Geothermal Congress 2015　paper number 12019　2015/04
Permeability and porosity structure change by dissolution of granite fracture under high temperature and confining pressure

Tanaka Hiroto, Okamoto Atsushi, Watanabe Noriaki, Tsuchiya Noriyoshi

Annual Meeting of the Geological Society of Japan　2015　204-204　2015
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2015.0_204 　
Beyond-laboratory-scale prediction for channeling flows through subsurface rock fractures with heterogeneous aperture distributions revealed by laboratory evaluation Peer-reviewed

Takuya Ishibashi, Noriaki Watanabe, Nobuo Hirano, Atsushi Okamoto, Noriyoshi Tsuchiya

Journal of Geophysical Research: Solid Earth　120　(1)　106-124　2015/01

DOI： 10.1002/2014JB011555 　

ISSN： 2169-9313

eISSN： 2169-9356
Poroelastic parameters of Berea sandstone containing water and CO2 under conditions in geologic sequestration of CO2 Peer-reviewed

渡邉則昭, 臼井祐人, 木崎彰久, 坂口清敏

石油技術協会誌　80　(5)　385-396　2015
Publisher:
DOI： 10.3720/japt.80.385 　

ISSN： 0370-9868
Changes In-situ rock stress in the Kamaishi mine before and after the 2011 Tohoku-oki earthquake

K. Sakaguchi, N. Watanabe, T. Yokoyama

ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014　724-732　2014
Process design of hydrogen production via the sulfur redox cycle under mild hydrothermal condition Peer-reviewed

P. Setiani, N. Watanabe, N. Tsuchiya

Proceedings of the Grand Renewable Energy 2014 Internationl Conference　O-Hf-4-1　2014
Predicting channeling flows through subsurface rock fractures beyond laboratory scale Peer-reviewed

T. Ishibashi, N. Watanabe, N. Hirano, A. Okamoto, N. Tsuchiya

Proceedings of the Grand Renewable Energy 2014 Internationl Conference　O-Ge-9-4　2014
Mechanical and hydraulic characteristics of a rock material under brittle-ductile transition Peer-reviewed

S. Takeyama, N. Watanabe, Y. Usui, K. Sakaguchi

Proceedings of the Grand Renewable Energy 2014 Internationl Conference　P-Ge-16　2014
Development of a method for removing geothermal scale using a low-speed selfrotating waterjet nozzle system under high ambient pressure Peer-reviewed

K. Shioya, A. Kizaki, N. Watanabe, K. Sakaguchi, T. Igi, T. Kon, K. Suzuki

Proceedings of the Grand Renewable Energy 2014 Internationl Conference　P-Ge-6　2014
Possibility of hydrogen production from aluminum wastes using low temperature geothermal resources Peer-reviewed

T. Kosaka, N. Watanabe, N. Tsuchiya

Proceedings of the Grand Renewable Energy 2014 Internationl Conference　P-Ge-11　2014
X-ray CT based numerical analysis for fluid flows through vuggy carbonate cores Peer-reviewed

H. Kusanagi, N. Watanabe, T. Shimazu, M. Yagi, T. Komai, N. Tsuchiya

Proceedings of the 20th Formation Evaluation Symposium of Japan　Paper N　2014
Relative permeability curves for gas-liquid two-phase flows through rock fractures Peer-reviewed

T. Kikuchi, N. Watanabe, K. Sakurai, T. Ishibashi, N. Tsuchiya

Proceedings of the 20th Formation Evaluation Symposium of Japan　Paper F　2014
砂岩の多孔質弾性パラメータにおけるTerzaghiの有効応力依存性－来待砂岩とBerea砂岩を例として－ Peer-reviewed

渡邉則昭, 臼井祐人, 木崎彰久, 坂口清敏

石油技術協会誌　79　(4)　224-233　2014
Publisher: The Japanese Association for Petroleum Technology
DOI： 10.3720/japt.79.224 　

ISSN： 0370-9868

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A long-term monitoring of carbon dioxide (CO₂) in a reservoir at depth is required for the geological storage of CO₂. For this requirement, an inversion technique utilizing tilt data of the ground surface associated with migration of CO₂ may be one of promising techniques. Poroelastic parameters of reservoir rocks (e.g., sandstone) should be well understood to increase reliability of the monitoring technique, because the inversion technique is based on the poroelastic theory. Better understanding of poroelastic parameters also contributes to geomechanical reservoir characterizations. For this purpose, focusing on a water-saturated part within a sandstone reservoir, a set of five kinds of laboratory tests has been conducted on Kimachi sandstone and Berea sandstone, saturated with water, to determine poroelastic parameters at various combinations of confining pressure (7-40 MPa) and pore pressure (5-25 MPa), namely various Terzaghi's effective stresses (2-35 MPa). Skempton's coefficient B and undrained bulk modulus have been determined by the B-test, in which volumetric strain and pore pressure changes with confining pressure. Drained bulk modulus and parameter H (inverse number of poroelastic expansion coefficient) have been determined by the P-test and the H-test, in which volumetric strain changes with confining pressure and pore pressure, respectively. Young's modulus and Poisson's ratio have been determined by both drained and undrained triaxial compression tests. Confining pressure and pore pressure dependencies for the poroelastic parameters have been examined separately, revealing that both dependencies may be integrated by Terzaghi's effective stress dependency. That is, every poroealstic parameter (y) having Terzaghi's effective stress dependency may be described by a function of Terzaghi's effective stress (σ_eff), y=a+b(1-e^-σX(X=_eff_/10)), where a and b are constants. Additionally, it has been revealed that Biot-Willis (effective stress) coefficient of sandstone with swelling clays can exceed unity at relatively high Terzaghi's effective stresses.
Modeling of three dimensional channeling flow within the Yufutsu oil/gas field Peer-reviewed

T. Ishibashi, N. Watanabe, N. Tsuchiya, T. Tamagawa

Proceedings of the 20th Formation Evaluation Symposium of Japan　Paper G　2014
Beyond-laboratory-scale prediction for channeling flows through subsurface rock fractures Peer-reviewed

N. Watanabe, T. Ishibashi, N. Hirano, A. Okamoto, N. Tsuchiya

ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014　1662-1671　2014
Poroelastic parameters of sandstones with and without swelling clay minerals Peer-reviewed

Y. Usui, N. Watanabe, A. Kizaki, K. Sakaguchi

Proceedings of the 8th Asian Rock Mechanics Symposium　PO-83　2014
Fundamental investigations on mechanical and hydraulic characteristics of the beyond-brittle geothermal reservoir Peer-reviewed

S. Takeyama, N. Watanabe, Y. Usui, K. Sakaguchi

Proceedings of the 8th Asian Rock Mechanics Symposium　PO-95　2014
GeoFlowを用いたき裂型貯留層における優先流路分布の評価 Invited Peer-reviewed

渡邉則昭, 石橋琢也, 土屋範芳, 玉川哲也

石油技術協会誌　78　(6)　482-490　2013/11

DOI： 10.3720/japt.78.482 　
Oil-water relative permeability curves for fractures in granite and limestone at different intrinsic permeabilites Peer-reviewed

K. Sakurai, N. Watanabe, T. Ishibashi, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, M. Yagi

Proceedings of the 19th Formation Evaluation Symposium of Japan　Paper I　2013/09
Poroelastic parameters of sandstone under various combinations of pore pressure and confining pressure Peer-reviewed

Y. Usui, N. Watanabe, A. Kizaki, K. Sakaguchi

Proceedings of the 19th Formation Evaluation Symposium of Japan　Paper J　2013/09
A predictive model and mechanisms associated with hydrogen production via hydrothermal reactions of sulfide Peer-reviewed

Putri Setiani, Noriaki Watanabe, Atsushi Kishita, Noriyoshi Tsuchiya

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　38　(26)　11209-11221　2013/08

DOI： 10.1016/j.ijhydene.2013.06.051 　

ISSN： 0360-3199
Experimental determination of poroelastic constants for sandstone under geologic CO2 sequestration conditions Peer-reviewed

Y. Usui, N. Watanabe, A. Kizaki, K. Sakaguchi

Proceedings of the 6th International Symposium on In-Situ Rock Stress　1086-1099　2013/08
Time-dependent permeability of carbonate fracture influenced by stress and pH Peer-reviewed

T. Ishibashi, T. P. McGuire, N. Watanabe, N. Tsuchiya, D. Elsworth

Proceedings of the 6th International Symposium on In-Situ Rock Stress　484-489　2013/08
Experimental and numerical determination of relative permeability curves for two-phase flow through a rock fracture under confining pressure Peer-reviewed

N. Watanabe, K. Sakurai, T. Ishibashi, N. Tsuchiya

Proceedings of the 6th International Symposium on In-Situ Rock Stress　524-533　2013/08
Permeability evolution in carbonate fractures: Competing roles of confining stress and fluid pH Peer-reviewed

Takuya Ishibashi, Thomas P. McGuire, Noriaki Watanabe, Noriyoshi Tsuchiya, Derek Elsworth

WATER RESOURCES RESEARCH　49　(5)　2828-2842　2013/05

DOI： 10.1002/wrcr.20253 　

ISSN： 0043-1397

eISSN： 1944-7973
Development of predictive model equation for hydrogen production from hydrothermal reaction of sulfide Peer-reviewed

Putri Setiani, Noriaki Watanabe, Atsushi Kishita, Noriyoshi Tsuchiya

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　245　(1)　642-643　2013/04

ISSN： 0065-7727
Geologic Core Holder with a CFR PEEK Body for the X-ray CT-Based Numerical Analysis of Fracture Flow Under Confining Pressure Peer-reviewed

Noriaki Watanabe, Takuya Ishibashi, Noriyoshi Tsuchiya, Yutaka Ohsaki, Tetsuya Tamagawa, Yoshihiro Tsuchiya, Hiroshi Okabe, Hisao Ito

ROCK MECHANICS AND ROCK ENGINEERING　46　(2)　413-418　2013/03

DOI： 10.1007/s00603-012-0311-5 　

ISSN： 0723-2632
Hydrothermal extractive upgrading of bitumen without coke formation Peer-reviewed

Javier Vilcaez, Masaru Watanabe, Noriaki Watanabe, Atsushi Kishita, Tadafumi Adschiri

FUEL　102　379-385　2012/12

DOI： 10.1016/j.fuel.2012.07.024 　

ISSN： 0016-2361

eISSN： 1873-7153
Temperature- and pH-dependent mechanism of hydrogen production from hydrothermal reactions of sulfide Peer-reviewed

Putri Setiani, Noriaki Watanabe, Atsushi Kishita, Noriyoshi Tsuchiya

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　37　(24)　18679-18687　2012/12

DOI： 10.1016/j.ijhydene.2012.10.013 　

ISSN： 0360-3199
GeoFlow: A novel model simulator for prediction of the 3-D channeling flow in a rock fracture network Peer-reviewed

Ishibashi, Takuya, Watanabe, Noriaki, Hirano, Nobuo, Okamoto, Atsushi, Tsuchiya, Noriyoshi

WATER RESOURCES RESEARCH　48　W07601　2012/07

DOI： 10.1029/2011WR011226 　

ISSN： 0043-1397
Hydrothermal synthesis of porous hydroxyapatite ceramics composed of rod-shaped particles and evaluation of their fracture behavior Peer-reviewed

Setsuaki Murakami, Katsuya Kato, Yuki Enari, Masanobu Kamitakahara, Noriaki Watanabe, Koji Ioku

CERAMICS INTERNATIONAL　38　(2)　1649-1654　2012/03

DOI： 10.1016/j.ceramint.2011.09.056 　

ISSN： 0272-8842
東北地方太平洋沖地震による岩手，宮城，福島県沿岸域の津波堆積物のヒ素に関するリスク評価 Peer-reviewed

土屋範芳, 井上千弘, 山田亮一, 山崎慎一, 平野伸夫, 岡本敦, 小川泰正, 渡邊隆広, 奈良郁子, 渡邉則昭, 東北地方津波堆積物研究グループ

地質学雑誌　118　(7)　419-430　2012
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2012.0043 　

ISSN： 0016-7630

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The Pacific coast of Tohoku District in Northeast Japan (Iwate, Miyagi, and Fukushima Prefectures) was seriously damaged by a violent tsunami resulting from the 2011 off the Pacific coast of Tohoku Earthquake on March 11 2011. The disaster area was covered by tsunami sediments, which are mainly marine sediments. We collected 137 tsunami sediments from Kuji City, Iwate Prefecture through to Minamisoma City, Fukushima Prefecture (40°11′N, 141°58′E to 37°43′N, 140°51′E). Analysis of bulk sediment chemistry and leaching test by pure water and seawater were carried out to access arsenic contamination. In addition, chemical forms of arsenic in different size fractions (<3 kDa, 3 kDa to 0.2 μm, 0.2 μm to 0.45 μm, and ≥0.45 μm) from the leachates were investigated by filtering techniques. Arsenic concentrations in the pure water leachates of 45 samples had higher arsenic levels than the Japanese Environmental Quality Standards for Soil Pollution (10 μg/l). In particular, tsunami sediments from the Ohya area in Kesen-numa City, Miyagi Prefecture, had arsenic levels 39 times greater than this threshold, reflecting the influence of gold mines in this region. The fraction of arsenic species < 3 kDa in size in leachates of the high arsenic samples was ca. 70%, indicating that most of the arsenic in the leachates is present as fine colloidal particles and/or dissolved species.
Upgrading of aperture model based on surface geometry of natural fracture for evaluating channeling flow Peer-reviewed

Takuya Ishibashi, Noriaki Watanabe, Nobuo Hirano, Atsushi Okamoto, Noriyoshi Tsuchiya

Transactions - Geothermal Resources Council　36 1　481-486　2012

ISSN： 0193-5933
Relative permeability measurement and numerical modeling of two-phase flow through variable aperture fracture in granite under confining pressure Peer-reviewed

N. Watanabe, K. Sakurai, T. Ishibashi, N. Tsuchiya

Geothermal Resources Council Transactions　36　583-587　2012
Experimental and numerical investigation of two-phase flow in a rock fracture under confining pressure Peer-reviewed

N. Watanabe, K. Sakurai, T. Ishibashi, N. Tsuchiya

Proceedings of the 18th Formation Evaluation Symposium of Japan　Paper G　2012
Impact of 3D channeling flow on well productivity in the yufutsu oil/gas field Peer-reviewed

Takuya Ishibashi, Noriaki Watanabe, Tetsuya Tamagawa, Nobuo Hirano, Atsushi Okamoto, Noriyoshi Tsuchiya

18th Formation Evaluation Symposium of Japan 2012　Paper K　2012
Supercritical methanol method for direct conversion of microalgae biomasses into biodiesel Peer-reviewed

D.A. Setiawati, A Nuryadi, N. Watanabe, A. Kishita, N. Tsuchiya

International Journal of Environment and Bioenergy　3　(1)　34-45　2012
Experimental and numerical evaluation of channeling flow in fractured type of geothermal reservoir

T. Ishibashi, N. Watanabe, N. Hirano, A. Okamoto, N. Tsuchiya

Proceedings of 37th Workshop on Geothermal Reservoir Engineering (Stanford University, Stanford, California, January 30 - Feburary 1, 2012)　759-766　2012/01
Characterisation and photocatalytic activity of structure-controlled spherical granules of an anatase/hydroxyapatite composite Peer-reviewed

Masanobu Kamitakahara, Osamu Kawaguchi, Noriaki Watanabe, Koji Ioku

MATERIALS RESEARCH BULLETIN　46　(12)　2283-2287　2011/12

DOI： 10.1016/j.materresbull.2011.08.059 　

ISSN： 0025-5408
X-ray CT based numerical analysis of fracture flow for core samples under various confining pressures Peer-reviewed

Watanabe, Noriaki, Ishibashi, Takuya, Ohsaki, Yutaka, Tsuchiya, Yoshihiro, Tamagawa, Tetsuya, Hirano, Nobuo, Okabe, Hiroshi, Tsuchiya, Noriyoshi

ENGINEERING GEOLOGY　123　(4)　338-346　2011/11

DOI： 10.1016/j.enggeo.2011.09.010 　

ISSN： 0013-7952
Precise 3D Numerical Modeling of Fracture Flow Coupled With X-Ray Computed Tomography for Reservoir Core Samples Peer-reviewed

N. Watanabe, T. Ishibashi, N. Hirano, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe

SPE JOURNAL　16　(3)　683-691　2011/09

DOI： 10.2118/146643-PA 　

ISSN： 1086-055X

eISSN： 1930-0220
Development of CFR-PEEK core holder for X-ray CT based numerical analysis of fluid flow within fractured samples under confining pressure Peer-reviewed

N. Watanabe, T. Ishibashi, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe, H. Ito

Proceedings of 17th Formation Evaluation Symposium of Japan　CD-ROM　Paper C　2011/09
Evaluation and Prediction of fluid flow through fracture under confining pressure in various scales Peer-reviewed

T. Ishibashi, N. Watanabe, N. Hirano, A. Okamoto, N. Tsuchiya

Proceedings of 17th Formation Evaluation Symposium of Japan　CD-ROM　Paper N　2011/09
Core analysis towards the integration with logging and borehole data Peer-reviewed

H. Ito, Y. Sanada, N. Watanabe, T. Tsuji, T. Mukunoki, F. Yamada, K. Kawabata

Proceedings of 17th Formation Evaluation Symposium of Japan　CD-ROM　Paper T　2011/09
Enhanced hydrogen production from biomass via the sulfur redox cycle under hydrothermal conditions Peer-reviewed

Putri Setiani, Javier Vilcaez, Noriaki Watanabe, Atsushi Kishita, Noriyoshi Tsuchiya

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　36　(17)　10674-10682　2011/08

DOI： 10.1016/j.ijhydene.2011.06.012 　

ISSN： 0360-3199
Effects of general zero-valent metals power of Co/W/Ni/Fe on hydrogen production with H2S as a reductant under hydrothermal conditions Peer-reviewed

Shiping Zhang, Fangming Jin, Xu Zeng, Jiajun Hu, Zhibao Huo, Yuanqing Wang, Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　36　(15)　8878-8884　2011/07

DOI： 10.1016/j.ijhydene.2011.04.227 　

ISSN： 0360-3199

eISSN： 1879-3487
Advanced direct use of geothermal energy for hydrogen production and material conversion Peer-reviewed

N. Tsuchiya, N. Watanabe

Geothermal Resources Council Transactions　35　143-146　2011
Sustainable and enhanced hydrogen production from biomass through sulfur redox cycle using georeactor Peer-reviewed

P. Setiani, J. Vilcaez, N. Watanabe, A. Kishita, N. Tsuchiya

Geothermal Resources Council Transactions　35　135-138　2011
Morphology and composition of hydroxyapatite particles synthesized hydrothermally from tricalcium phosphates Peer-reviewed

M. Kamitakahara, Y. Enari, N. Watanabe, K. Ioku

Transactions of the Materials Research Society of Japan　36　(3)　405-408　2011
Publisher: The Materials Research Society of Japan
DOI： 10.14723/tmrsj.36.405 　

ISSN： 1382-3469

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Hydroxyapatite (HA) ceramics are used as artificial bones and adsorbents. The properties of HA particles are dependent on their morphology and composition. To reveal the effects of these factors, tailored HA particles are required. In the present study, HA particles with a controlled morphology and composition were prepared using the hydrothermal treatment of α- or β-tricalcium phosphate (α- or β-TCP) particles in an acidic or basic solutions at 120−240 °C. Plate-like HA particles were obtained when α-TCP was treated with the acidic solution. Rod-like HA particles were obtained when α-TCP was treated with the basic solution or when β-TCP was treated with the acidic solution. Rice-like HA particles were obtained when β-TCP was treated with the basic solution. The HA particles that were obtained under these conditions had a calcium-deficient composition, and the Ca/P molar ratio approached the stoichiometric value when the treatment temperature was increased. The morphology and composition of HA particles were controlled by selecting the starting materials and hydrothermal conditions.
EOR simulation by in situ nitrogen production via denitrifying bacteria and performance improvement by nitrogen alternating surfactant injection

A. Nuryadi, A. Kishita, N. Watanabe, J. Vilcaez, N. Kawai

Proceedings of SPE Asia Pacific Oil and Gas Conference and Exhibition 2011　2　1422-1427　2011
Analysis of fracture flow within reservior core sample under confining pressure by numerical modeling coupled with X-ray computed tomography Peer-reviewed

N. Watanabe, T. Ishibashi, N. Hirano, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe

Proceedings of The 16th Formation Evaluation Symposium of Japan　CD-ROM　Paper G　2010/10
Hydrothermal synthesis and characterization of hydroxyapatite from octacalcium phosphate Peer-reviewed

Natsuko Ito, Masanobu Kamitakahara, Setsuaki Murakami, Noriaki Watanabe, Koji Ioku

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　118　(1380)　762-766　2010/08

DOI： 10.2109/jcersj2.118.762 　

ISSN： 1882-0743

eISSN： 1348-6535
Formation of Hydroxyapatite Microtubes Assisted with Anatase under Hydrothermal Conditions Peer-reviewed

Masanobu Kamitakahara, Setsuaki Murakami, Hiroko Takahashi, Noriaki Watanabe, Koji Ioku

CHEMISTRY LETTERS　39　(8)　854-855　2010/08

DOI： 10.1246/cl.2010.854 　

ISSN： 0366-7022

eISSN： 1348-0715
New concept discrete fracture network model simulator, GeoFlow, and three dimensional channeling flow in fracture network Peer-reviewed

N. Hirano, T. Ishibashi, N. Watanabe, A. Okamoto, N. Tsuchiya

Proceedings World Geothermal Congress 2010　DVD　Paper Number 2249　2010/04
Three dimensional numerical modeling of fracture flow for rock core coupled with X-ray computed tomography Peer-reviewed

N. Watanabe, Y. Ohsaki, T. Tamagawa, N. Hirano, Y. Tsuchiya, H. Okabe, N. Tsuchiya

Proceedings World Geothermal Congress 2010　DVD　Paper Number 3142　2010/04
Evaluation of three dimensional channeling flow by new concept discrete fracture network model simulator, GeoFlow Peer-reviewed

T. Ishibashi, N. Watanabe, N. Hirano, N. Tsuchiya

Proceedings of the Renewable Energy 2010　CD-ROM　Paper O-Ge-2-3　2010
Visualization of three dimensional channeling flow in fracture system by new concept model simulator, GeoFlow

T. Ishibashi, N. Watanabe, N. Hirano, A. Okamoto, N. Tsuchiya

Proceedings of G-COE Symposium 2010 Dynamic Earth and Heterogeneous Structure　191-193　2010
Synthesis of designed hydroxyapatite particles using hydrothermal process Peer-reviewed

M. Kamitakahara, N. Ito, Y. Enari, N. Watanabe, K. Ioku, C. B. Ustundag

Proceedings of 15th International Metallurgy & Materials Congress　631-636　2010
Carbonate hydroxyapatite prepared by hydrothermal treatment of calcium carbonate Peer-reviewed

W. Park, Z. Mohamad, M. Kamitakahara, N. Watanabe, C. B. Ustundag, K. Ioku

Proceedings of 15th International Metallurgy & Materials Congress　623-630　2010
Preparation and characterization of granules composed of rod-shaped beta-tricalcium phosphate particles Peer-reviewed

R. Fujii, M. Kamitakahara, N. Watanabe, T. Ikeda, K. Ioku

Proceedings of 15th International Metallurgy & Materials Congress　637-643　2010
Preparation of hydroxyapatite microtube using hydrothermal process in the presence of titania Peer-reviewed

H. Takahashi, M. Kamitakahara, S. Murakami, N. Watanabe, K. Ioku

Proceedings of 15th International Metallurgy & Materials Congress　2160-2165　2010
Observation of the heavy crude oil dissolution behavior under supercritical condition of water

A. Kishita, N. Watanabe, J. V. Pe, ez

Proceedings of International Petroleum Technology Conference　CD-ROM　IPTC 13898-2924　2009/12

DOI： 10.2523/IPTC-13891-MS 　
Evaluation of photocatalytic activity of anatase/hydroxyapatite composite granules for environmental purification Peer-reviewed

Masanobu Kamitakahara, Setsuaki Murakami, Noriaki Watanabe, Shidong Ji, Harumitsu Nishikawa, Koji Ioku

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　117　(1371)　1172-1174　2009/11

DOI： 10.2109/jcersj2.117.1172 　

ISSN： 1882-0743

eISSN： 1348-6535
Utilization of X-ray computed tomography in three dimensional numerical modeling of fluid flow through fractured rock core Peer-reviewed

N. Watanabe, Y. Ohsaki, Y. Tsuchiya, T. Tamagawa, N. Hirano, H. Okabe, T. Tsuchiya

Proceedings of the 15th Formation Evaluation Symposium of Japan　M1-M10　2009/10
Three dimensional analysis of channeling flow by new discrete fracture network model simulator, GeoFlow Peer-reviewed

T. Ishibashi, N. Watanabe, N. Hirano, A. Okamoto, N. Tsuchiya

Proceedings of the 15th Formation Evaluation Symposium of Japan　N1-N6　2009/10
Water soluble/insoluble fractions of bitumen at hydrothermal conditions inferred by direct observation using visible-type autoclave Peer-reviewed

N. Watanabe, Y. Takeuchi, T. Kayouda, A. Kishita

Proceedings of the 8th world congress of chemical engineering　published by electronic media　2009/08
Diversity of channeling flow in heterogeneous aperture distribution inferred from integrated experimental-numerical analysis on flow through shear fracture in granite Peer-reviewed

Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

Journal of Geophysical Research: Solid Earth　114　(4)　B04208　2009/04

DOI： 10.1029/2008JB005959 　

ISSN： 2169-9313

eISSN： 2169-9356
Direct measurement of contact area and stress dependence of anisotropic flow through rock fracture with heterogeneous aperture distribution Peer-reviewed

Katsumi Nemoto, Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

Earth and Planetary Science Letters　281　(1-2)　81-87　2009/04

DOI： 10.1016/j.epsl.2009.02.005 　

ISSN： 0012-821X
Hydrothermal synthesis of hydroxyapatite from octacalcium phosphate: effect of hydrothermal temperature Peer-reviewed

Masanobu Kamitakahara, Natsuko Ito, Setsuaki Murakami, Noriaki Watanabe, Koji Ioku

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　117　(1363)　385-387　2009/03

DOI： 10.2109/jcersj2.117.385 　

ISSN： 1882-0743

eISSN： 1348-6535
超臨界水処理におけるビチューメンの溶解挙動その場観察

竹内祐介, 渡邉則昭, 木下睦

化学工学会研究発表講演要旨集　2009　396-396　2009
Publisher: 公益社団法人化学工学会
DOI： 10.11491/scej.2009.0.396.0 　
Calcium Phosphate Porous Materials with Unique Microstructures Peer-reviewed

Koji Ioku, Masanobu Kamitakahara, Noriaki Watanabe, Osamu Kawaguchi, Setsuaki Murakami, Tohru Ikeda

BIOCERAMICS 21　396-398　645-648　2009

DOI： 10.4028/0-87849-353-0.645 　

ISSN： 1013-9826
Mechanical properties of porous hydroxyapatite ceramics composed of rod-shaped particles with controlled aspect ratio Peer-reviewed

S. Murakami, K. Kato, Y. Enari, M. Kamitakahara, N. Watanabe, K. Ioku

Archives of BioCeramics Research　9　263-266　2009
Hydrothermal Synthesis of Hydroxyapatite/Titania Granules Using Water-soluble Titanium Complex Peer-reviewed

Masanobu Kamitakahara, Osamu Kawaguchi, Noriaki Watanabe, Koji Ioku

Archives of BioCeramics Research　9　187-190　2009
Characterization of Hydroxyapatite Synthesized by Hydrothermal Treatment of Octacalcium Phosphate Peer-reviewed

Natsuko Ito, Masanobu Kamitakahara, Setsuaki Murakami, Noriaki Watanabe, Koji Ioku

Archives of BioCeramics Research　9　67-70　2009
Preparation of Globular Hydroxyapatite Composed of Plate-like Particles Peer-reviewed

K. Sasaki, M. Kamitakahara, N. Watanabe, K. Ioku

Processing and Fabrication of Advanced Materials XVIII　3　1385-1392　2009
Surface Characterization of Hydroxyapatite with Specific Crystal Face Tailored by Hydrothermal Process Peer-reviewed

Y. Enari, M. Kamitakahara, N. Watanabe, K. Ioku

Bioceramics 22　22　55-58　2009
Preparation of Hydroxyapatite Spheres Composed of Plate-like Particles by Hydrothermal Treatment of Supersaturated Calcium Phosphate Solution Peer-reviewed

K. Sasaki, M. Kamitakahara, N. Watanabe, K. Ioku

Bioceramics 22　22　39-42　2009
Synthesis of Silicon-doped Tricalcium Phosphate through Wet Chemical Process Peer-reviewed

M. Kamitakahara, H. Kamura, N. Watanabe, K. Ioku, C. Ohtsuki

Bioceramics 22　22　31-34　2009
Evaluation of Octacalcium Phosphate for Application to Drug Carrier Peer-reviewed

N. Ito, M. Kamitakahara, N. Watanabe, K. Ioku

Bioceramics 22　22　27-30　2009
Development of discrete fracture network model simulator, GeoFlow, for evaluation of three dimensional channeling flow

T. Ishibashi, N. Watanabe, N. Hirano, A. Okamoto, N. Tsuchiya

Society of Petroleum Engineers - International Petroleum Technology Conference 2009, IPTC 2009　1　352-357　2009
Three dimensional numerical analysis of fluid flow through fractured rock core using X-ray computed tomography

N. Watanabe, N. Hirano, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe

Society of Petroleum Engineers - International Petroleum Technology Conference 2009, IPTC 2009　1　408-420　2009

DOI： 10.2523/IPTC-13164-MS 　
Determination of aperture structure and fluid flow in a rock fracture by high-resolution numerical modeling on the basis of a flow-through experiment under confining pressure Peer-reviewed

Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

Water Resources Research　44　(6)　W06412　2008/06

DOI： 10.1029/2006WR005411 　

ISSN： 0043-1397
1-10 Kinetics Study of Cracking Super Heavy Oil in Supercritical water

TAKEUCHI Yusuke, WATANABE Noriaki, KISHITA Atsushi, TOHJI Kazuyuki, ABE Jun

Proceedings of the Annual Conference of The Japan Institute of Energy　17　20-21　2008
Publisher: The Japan Institute of Energy
DOI： 10.20550/jietaikaiyoushi.17.0_20 　
Experimental and numerical analysis of flow path change in rock fracture under hydrothermal condition

N. Watanabe, H. Iijima, N. Hirano, N. Tsuchiya

AIP Conference Proceedings　987　133-136　2008

DOI： 10.1063/1.2896959 　

ISSN： 0094-243X

eISSN： 1551-7616
Evaluation of fluid flow field in single rock fracture during frictional sliding

K. Nemoto, N. Watanabe, N. Tsuchiya

WATER DYNAMICS　987　123-128　2008

DOI： 10.1063/1.2896957 　

ISSN： 0094-243X
Synthesis of spherical granules composed of rod-shaped hydroxyapatite particles utilizing a hydrothermal process Peer-reviewed

M. Kamitahara, T. Takahashi, G. Kawachi, N. Watanabe, K. Ioku

Proc. 4th Int. Symp. Apatites and Correlative Biomaterials (ISACB2008)　26-28　2008
Relationship between rate of aperture reduction and contact pressure of fracture in granite under hydrothermal condition Peer-reviewed

Noriaki Watanabe, Hiroshi Lijima, Nobuo Hirano, Noriyoshi Tsuchiya

Transactions - Geothermal Resources Council　32　416-421　2008

ISSN： 0193-5933
Precipitation of silica minerals by hydrothermal flow-through experiments at 200-430 °C and 30 MPa Peer-reviewed

Atsushi Okamoto, Hanae Saishu, Nobuo Hirano, Noriaki Watanabe, Noriyoshi Tsuchiya

Transactions - Geothermal Resources Council　32　331-334　2008

ISSN： 0193-5933
Preparation of Calcium Phosphate Porous Materials with Unique Microstructures Peer-reviewed

K. Ioku, M. Kamitakahara, N. Watanabe, T. Takahashi, S. Murakami, T. Ikeda

Archieves of Bio Ceramics Research　8　28-31　2008
42 The Role of High Temperature and High Pressure Water in On-site Process for Upgrading Bitumen

TAKEUCHI Yusuke, WATANABE Noriaki, KISHITA Atsushi, TOHJI Kazuyuki, NAKAMURA Tsuneta, MORIYA Takehiko

Proceedings of Conference on Coal Science　44　84-85　2007
Publisher: The Japan Institute of Energy
DOI： 10.20550/jiesekitanronbun.44.0_84 　

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Studies on the role of supercritical water in on-site upgrading system of bitumen by hydrothermal were carried out by varying experimental parameter such as reaction pressure, which influences the density of water. Experiments were carried out using a continuous flow reacting system operated under a temperature of 430 C. From the results such as the viscosity and the production of toluene insoluble and so forth, it was found that higher density supercritical water inhibits the pyrolysis of bitumen to lower molecular weight substance and the coking. Sato et al. found that the corking was inhibited because interactions among aromatic rings in quinoline could be disrupted. The dielectric constant of water in supercritical region is decreased to the same level of organic solvent. These interactions may be disrupted in the supercritical water. Accordingly, the supercritical water may easily exist around the hydrocarbons . As a result, this may prevent the bitumen from corking.
Partial upgrading by supercritical water for various heavy crude oils

Takeuchi Yusuke, Watanabe Noriaki, Jing Zhenzi, Miyamoto Dai, Kishita Atsushi, Tohji Kazuyuki

Proceeding of Annual/Fall Meetings of the Japan Petroleum Institute　2007　61-61　2007
Publisher: The Japan Petroleum Institute
DOI： 10.11523/sekiyu.2007f.0.61.0 　
Numerical evaluation of anisotropic fluid flow in sheared rock fractures

K. Nemoto, N. Watanabe, H. Oka, N. Hirano, N. Tsuchiya

WATER DYNAMICS　898　36-+　2007

DOI： 10.1063/1.2721246 　

ISSN： 0094-243X
Evaluation of aperture structure and fluid flow in shear fracture of granite using high-resolution numerical modeling technique

N. Watanabe, N. Hirano, N. Tsuchiya

WATER DYNAMICS　898　66-+　2007

DOI： 10.1063/1.2721251 　

ISSN： 0094-243X
Evaluation of flow anisotropy within a simulated shear fracture under stress conditions from shallow to deep reservoirs Peer-reviewed

Katsumi Nemoto, Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

Transactions - Geothermal Resources Council　31　301-306　2007

ISSN： 0193-5933
Observation of flow path change in rock fracture under hydrothermal condition using a coupled experimental-numerical method Peer-reviewed

Noriaki Watanabe, Hiroshi Iijima, Nobuo Hirano, Noriyoshi Tsuchiya

Transactions - Geothermal Resources Council　31　323-327　2007

ISSN： 0193-5933
Evaluation of fluid flow path in a single fracture undergoing normal stress and shear offset

K. Nemoto, H. Oka, N. Watanabe, N. Hirano, N. Tsuchiya

AIP Conference Proceedings　833　156-161　2006/05/15

DOI： 10.1063/1.2207095 　

ISSN： 0094-243X

eISSN： 1551-7616
High resolution modeling of aperture structure and flow path in rock fracture

N. Watanabe, N. Hirano, T. Tamagawa, K. Tezuka, N. Tsuchiya

AIP Conference Proceedings　833　173-176　2006/05/15

DOI： 10.1063/1.2207099 　

ISSN： 0094-243X

eISSN： 1551-7616
Experimental evaluation of fluid flow through artificial shear fracture in Granite Peer-reviewed

Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

Transactions - Geothermal Resources Council　30 I　361-366　2006

ISSN： 0193-5933
Fundamental study for prediction of productivity in oil/gas fractured reservoir based on flow-through experiment under confining pressure Peer-reviewed

N. Watanabe, N. Hirano, T. Tamagawa, T. Tezuka, N. Tsuchiya

Journal of The Japanease Association for Petroleum Technology　71　(2)　217-226　2006
Publisher: The Japanese Association for Petroleum Technology
DOI： 10.3720/japt.71.217 　

ISSN： 0370-9868

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Flow-through experiments were performed for single tensile fractures artificially created in granite, using Rubber-Confining Pressure Vessel (R-CPV), which has been developed for the experiments under relative high confining pressure conditions up to 100 MPa. The experimental results showed great differences in permeability depending on degree of offset along the fracture surface. In case of the fractures without offset, permeability decreased significantly with increasing confining pressure until around 40-50 MPa, beyond which the permeability, however, decreased gradually and then became constant, and remained much higher than that of rock matrix even at 100 MPa. In case of the fractures with 1, 3, 5 and 10 mm offset, permeability was much higher than that of the fractures without offset. The behavior of permeability for increase of confining pressure, however, drastically changed between 1 mm and other offset conditions. No obvious decrease of permeability was observed with increasing confining pressure in case of 3, 5 and 10 mm offset, while permeability decreased continuously until 70 MPa and abrupt decrease was also observed at 80 MPa in case of 1 mm offset. Those results indicate understanding of offset conditions is a key factor for prediction of productivity in oil/gas fractured reservoir.
Development of rubber confining pressure vessel and flow test using this apparatus Peer-reviewed

N. Hirano, N. Watanabe, N. Tsuchiya

Journal of The Mining and Materials Processing Institute of JAPAN　121　(10)　484-488　2005
Publisher: The Mining and Materials Processing Institute of Japan
DOI： 10.2473/shigentosozai.121.484 　

ISSN： 0916-1740

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A new type of confining vessel has been developed to undertake high-pressure, flow test experiments, at simulated lithospheric stress conditions. Confining pressure is generated by the uniaxial compression of a rubber medium, which leads to the term Rubber-Confining Pressure vessel ‰ (R-CPV) to describe this system. The pressure vessel is composed of an outside cylinder, an inside cylinder to hold the sample, rubber to generate the confining pressure and facilitate sample sealing, a hollow piston for rubber compression, and an outside piston for hollow piston compression and maintaining inner fluid pressure. The fundamental principle of the R-CPV apparatus is the establishment of confining pressures which utilizes rubber elasticity to generate isotropic pressure. The rubber is bound to the sample and hollow piston only compresses the rubber. Pressure of compression is converted to confining pressure, which correspondingly affects the sample. The outside piston has holes for fluid inflow and outflow. Testing of the R-CPV vessel, using butadiene rubber, has shown it can generate over 100 MPa maximum confining pressure, with 245kN pressing capacity, and facilitate permeability measurements under a range of high confining pressures. For example, preliminary results of flow test experiments for tension cracks in Inada granite, show hydraulic permeability rapidly decreases at <50 MPa confining pressure, whilst the apparent decrease in hydraulic permeability declines more gently at conditions of >50 MPa. Our experiments show that the new R-CPV apparatus has great potential for better understanding a wide range of geological issues, and likely industrial applications, as it can accommodate permeability-flow testing under a wide range of high confining pressure conditions.
Measurement of hydraulically ineffective area on a fracture under normal stress condition Peer-reviewed

Katsumi Nemoto, Hideyuki Oka, Noriaki Watanabe, Nobuo Hirano, Noriyoshi Tsuchiya

Transactions - Geothermal Resources Council　29　413-417　2005

ISSN： 0193-5933
Numerical estimation of aperture structure and flow wetted field in rock fracture Peer-reviewed

N. Watanabe, N. Hirano, T. Tamagawa, K. Tezuka, N. Tsuchiya

Transactions - Geothermal Resources Council　29　431-436　2005

ISSN： 0193-5933
Flow path and distribution of permeability in single rock fracture based on flow experiment using rubber-confining pressure vessel

N. Watanabe, N. Tsuchiya, N. Hirano, K. Nemoto

Proceedings of the 1st workshop on IODP physical property measurement　8-15　2005
Permeability measurement for large rock fracture using rubber-confining pressure vessel Peer-reviewed

N. Watanabe, N. Hirano, N. Tsuchiya

Proceedings of 26th Annual New Zealand Geothermal Workshop　2004
Development of rubber-confining pressure vessel (R-CPV) and permeability measurement of granite rock fracture

N. Watanabe, N. Hirano, N. Tsuchiya

Proceedings of 2nd International Workshop on WATER DYNAMICS　121-124　2004
Experimental and numerical analysis of hydrothermal channel flow through a tensile fracture in granite Peer-reviewed

N. Watanabe, N. Tsuchiya

Geothermal Resources Council Transactions　27　743-746　2003

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Misc. 52

Process and optimum pH in permeability enhancement of granite by chelating-agent-induced selective mineral dissolution

高橋亮太, 渡邉則昭, 中村謙吾, 駒井武

日本地熱学会学術講演会講演要旨集　2021　2021
Chemical characterization of paleo-tsunami deposits by data-driven analysis

佐藤就太, 中村謙吾, 渡邉則昭, 駒井武

Proceedings of Symposium on Geo-Environments and Geo-Technics　31st　2021

ISSN： 0917-7183
Visualization of pores and predominant flow paths in undisturbed viscous soil and organic matter soil

中村謙吾, 土田恭平, 渡邉則昭, 駒井武

地下水・土壌汚染とその防止対策に関する研究集会講演集(Web)　26th　2021
Relationship between the formation of flow paths and elution behavior with water flow through the soil column

土田恭平, 中村謙吾, 近藤萌波, 渡邉則昭, 駒井武

地下水・土壌汚染とその防止対策に関する研究集会講演集(Web)　26th　2021
A new chemical stimulation: Selective mineral dissolution in fractures by chelating agent flooding

高橋香於里, 渡邉則昭, 中村謙吾, 駒井武, 熊野裕介, 赤工浩平, 玉川哲也

日本地熱学会学術講演会講演要旨集　2020　2020
Formation of amorphous silica particles and its influences on permeability of granite fractures in supercritical geothermal environments

阿部光, 渡邉則昭, 中村謙吾, 岡本敦, 駒井武

日本地熱学会学術講演会講演要旨集　2020　2020
Formation process of cloud-fracture network by superhot hydraulic fracturing

後藤遼太, 渡邉則昭, 坂口清敏, PRAMUDYO Eko, 駒井武, 土屋範芳, CHEN Y., 石橋琢也, FRANCESCO Parisio, 吉岡慶太

日本地熱学会学術講演会講演要旨集　2020　2020
Characteristics of factors that release mercury from soil and prediction of mercury flux emission

近藤萌波, 中村謙吾, 土田恭平, 渡邉則昭, 駒井武

資源・素材(Web)　2020　2020
Visualization of flow path in soil column by X-ray CT

土田恭平, 中村謙吾, 近藤萌波, 渡邉則昭, 駒井武

資源・素材(Web)　2020　2020
土壌カラム内に形成される流路と溶出挙動との関係

土田恭平, 中村謙吾, 近藤萌波, 渡邉則昭, 駒井武

環境工学研究フォーラム講演集　57th　2020
水圧・減圧破砕による人工超臨界地熱貯留層造成に関する研究

渡邉則昭, 坂口清敏, 平野伸夫, 鈴木杏奈, 後藤遼太, 三浦崇宏, BAILONG Liu, 伊藤高敏, 駒井武, 土屋範芳, 渡邉教弘, 石橋琢也, 浅沼宏

日本地熱学会学術講演会講演要旨集　2019　35-35　2019/11
弾性波計測に基づく超臨界地熱環境における水圧破砕現象の特性評価

三浦崇宏, 渡邉則昭, 坂口清敏, 後藤遼太, 山根宏太, 駒井武, CHEN Youqing, 石橋琢也, 土屋範芳

日本地球惑星科学連合大会予稿集(Web)　2019　ROMBUNNO.SCG58‐10 (WEB ONLY)　2019
CO₂地中貯留条件下における火山性砂岩の力学特性変化

服部晃己, 渡邉則昭, 岡本敦, 中村謙吾, 駒井武, 玉川哲也

石油技術協会誌　83　(4)　286　2018/07

ISSN： 0370-9868
弾性波計測に基づく超臨界地熱環境における水圧破砕現象の特性評価

三浦崇宏, 渡邉則昭, 坂口清敏, 後藤遼太, 山根宏太, 駒井武, 土屋範芳, CHEN Y., 石橋琢也

日本地熱学会学術講演会講演要旨集　2018　2018
高温延性花崗岩き裂における圧力溶解・自由表面溶解による透水性変化

斎藤耕平, 渡邉則昭, 岡本敦, 土屋範芳, 駒井武, 石橋琢也, 最首花恵, 渡邉教弘

日本地熱学会学術講演会講演要旨集　2018　2018
超臨界岩体内での人工貯留層造成に関する室内実験

後藤遼太, 渡邉則昭, 坂口清敏, 三浦崇宏, 山根宏太, 駒井武, 土屋範芳, CHEN Y., 石橋琢也

日本地熱学会学術講演会講演要旨集　2018　2018
超臨界地熱環境における花崗岩の水圧破砕および透水性増加

後藤遼太, 渡邉則昭, 坂口清敏, 三浦崇宏, 山根宏太, 石橋琢也, CHEN Youqing, 駒井武, 土屋範芳

資源・素材(Web)　2018　2018
CO₂地中貯留条件下における火山性砂岩の力学特性変化

服部晃己, 渡邉則昭, 岡本敦, 中村謙吾, 駒井武, 玉川哲也

石油技術協会特別講演会・春季講演会(シンポジウム・個人講演)要旨集　2018　2018
Effect of dry-out phenomenon on porosity and permeability characteristic changes in rocks for CO₂ geological storage

越前壮一, 渡邊則昭, 駒井武, 橋田俊之

日本機械学会東北支部総会・講演会講演論文集(Web)　2017.52　2017

ISSN： 2424-2713
X線CTを用いたカラム内部流路の可視化による卓越流路の粒径依存特性の評価

青木飛翔, 中村謙吾, 渡邉則昭, 駒井武

資源・素材(Web)　2016　2016
上向流カラム通水試験の土壌中における卓越流路の三次元可視化

青木飛翔, 中村謙吾, 渡邉則昭, 駒井武

地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)　22nd　2016
Hydrogen production from biaomass via sulfur redox cycle

Noriaki Watanabe

Monthly Magazine Chemical Engineering　60　(10)　1-6　2015/10/01
Publisher: Kagaku Kogyo Sha
400°Cまでの高圧熱水環境からの急減圧に伴う鉱物き裂生成の検討

笠原尚也, 平野伸夫, 渡邉則昭, 土屋範芳

日本地熱学会学術講演会講演要旨集　2014　A05　2014
鉱物および流体の相変化にともなう岩石破壊に関する実験的研究

青島聡, 平野伸夫, 渡邉則昭, 土屋範芳

日本地熱学会学術講演会講演要旨集　2014　P23　2014
超臨界から亜臨界水熱環境下における岩石き裂生成に関する実験的研究

笠原尚也, 平野伸夫, 渡邉則昭, 土屋範芳

日本地熱学会学術講演会講演要旨集　2013　44　2013
GeoFlowによるマルチスケールフラクチャーネットワークの流体流動特性の評価と予測

石橋琢也, 渡邉則昭, 平野伸夫, 岡本敦, 土屋範芳

石油技術協会誌　77　(4)　292　2012/07

ISSN： 0370-9868
熱水環境下における流体の接触または相変化に伴う鉱物の破壊に関する実験的検討

平野伸夫, 山本啓司, 岡本敦, 渡邉則昭, 土屋範芳

日本地熱学会学術講演会講演要旨集　2012　94　2012
3Dチャネリングフローのモデリング手法とフィールドスケールへの拡張

石橋琢也, 渡邉則昭, 平野伸夫, 岡本敦, 土屋範芳, 玉川哲也

日本地熱学会学術講演会講演要旨集　2012　106　2012
封圧下におけるフラクチャー内流体流動のマルチスケールモデリング

石橋琢也, 渡邉則昭, 平野伸夫, 岡本敦, 土屋範芳

石油技術協会誌　76　(4)　358　2011/07

ISSN： 0370-9868
二次元フラクタル則による岩石き裂内流体流動モデルのスケールアップ

石橋琢也, 渡邉則昭, 平野伸夫, 岡本敦, 土屋範芳

日本地熱学会学術講演会講演要旨集　2011　54　2011
花崗岩フラクチャーの間隙構造における寸法依存性の評価

石橋琢也, 渡邉則昭, 平野伸夫, 岡本敦, 土屋範芳

石油技術協会誌　75　(4)　314-315　2010/07

ISSN： 0370-9868
X線CTを利用した封圧下の貯留層コアサンプルにおけるき裂流体流動の可視化

渡邉則昭, 石橋琢也, 平野伸夫, 土屋範芳, 大崎豊, 玉川哲也, 土屋慶洋, 岡部博

日本地熱学会学術講演会講演要旨集　2010　98　2010
X線CTスキャナを用いた岩石き裂コアの高封圧下流動実験

大崎豊, 玉川哲也, 渡邉則昭, 平野伸夫, 土屋範芳, 岡部博, 土屋慶洋

資源・素材　2010　(1)　291-292　2010

ISSN： 0919-7915
封圧下のX線CTに基づいた数値モデル解析による岩石き裂内流体流動の可視化

渡邉則昭, 平野伸夫, 土屋範芳, 大崎豊, 玉川哲也, 土屋慶洋, 岡部博

資源・素材　2010　(1)　293-294　2010

ISSN： 0919-7915
き裂不均質間隙構造の寸法依存性を考慮した“GeoFlow”による3次元チャネリングフローの精密モデリング

石橋琢也, 渡邉則昭, 平野伸夫, 土屋範芳

日本地熱学会学術講演会講演要旨集　2010　35　2010
三次元チャネリングフロー解析のためのDFNモデルシミュレータ“GeoFlow”の開発

石橋琢也, 渡邉則昭, 平野伸夫, 岡本敦, 土屋範芳

石油技術協会誌　74　(5)　507-508　2009/09

ISSN： 0370-9868
三次元チャネリングフロー解析のためのDFNモデルシミュレータ“GeoFlow”の開発

石橋琢也, 渡邉則昭, 平野伸夫, 岡本敦, 土屋範芳

石油技術協会誌　74　(4)　370　2009/07

ISSN： 0370-9868
X線CTを用いた岩石コア内部天然フラクチャーにおける流体流動の三次元モデリング

渡邉則昭, 平野伸夫, 土屋範芳, 大崎豊, 玉川哲也

石油技術協会誌　74　(4)　371　2009/07

ISSN： 0370-9868
シミュレーションを用いた三次元チャンネルフローの可視化

平野伸夫, 石橋琢也, 渡邉則昭, 土屋範芳

資源・素材学会春季大会講演集　(1)　55-56　2009/03/26

ISSN： 1343-9898
岩石き裂内流体流動と岩石‐水反応場(FWS)

平野伸夫, 石橋琢也, 渡邊則昭, 土屋範芳

日本鉱物科学会年会講演要旨集　2009　9　2009

DOI： 10.14824/jakoka.2009.0.9.0 　

ISSN： 1348-6543
PETR 70-Role of supercritical water for hydrothermal cracking of bitumen

Noriaki Watanabe, Atsushi Kishita, Jun Abe

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY　236　2008/08

ISSN： 0065-7727
地下き裂における間隙・流路構造の不均質性

渡邉則昭, 平野伸夫, 土屋範芳

資源・素材　2008　19　2008

ISSN： 0919-7915
流通式反応器を用いた石英の溶解・析出実験

岡本敦, 平野伸夫, 渡辺則昭, 土屋範芳

日本地質学会学術大会講演要旨　114th　298-298　2007/09/01
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2007.0.584.0 　

ISSN： 1348-3935
熱水流通実験に基づく数値モデリングによる岩石き裂内における流路変化の評価

飯島洋, 渡邉則昭, 平野伸夫, 土屋範芳

日本地熱学会学術講演会講演要旨集　2007　42　2007
封圧の増加に伴うせん断フラクチャーの透水性と流路構造の変化

渡邉則昭, 平野伸夫, 土屋範芳, 玉川哲也, 手塚和彦, 鈴木健一郎

石油技術協会誌　71　(4)　379　2006/07

ISSN： 0370-9868
高分解能数値モデリング手法による花崗岩せん断き裂の間隙構造と流体流動の評価

渡邉則昭, 平野伸夫, 土屋範芳

日本地熱学会学術講演会講演要旨集　2006　P02　2006
き裂内流体流動の異方性における垂直応力ならびにせん断変位の影響

根本克己, 渡邉則昭, 岡秀行, 平野伸夫, 土屋範芳

日本地熱学会学術講演会講演要旨集　2006　B20　2006
単一き裂の接触分布測定とき裂内流路構造の推定

根本克己, 岡秀行, 渡邉則昭, 平野伸夫, 土屋範芳

日本地熱学会学術講演会講演要旨集　2005　B02　2005
ゴムを圧力媒体とした封圧発生装置の開発と花こう岩き裂透水試験

平野伸夫, 渡辺則昭, 土屋範芳

高圧討論会講演要旨集　45th　217　2004/09/30

ISSN： 0917-6373
ゴム弾性圧力媒体を用いた封圧容器の開発

平野伸夫, 渡辺則昭, 土屋範芳

資源・素材学会春季大会講演集　16　(1)　1-2　2004/03/29

ISSN： 1343-9898
ゴム弾性封圧装置を用いた岩石き裂の透水性評価

渡邉則昭, 平野伸夫, 土屋範芳, 玉川哲也, 手塚和彦

日本地熱学会学術講演会講演要旨集　2004　B02　2004
岩石き裂の間隙構造と流体流動特性

渡辺則昭, 平野伸夫, 土屋範芳

日本地熱学会学術講演会講演要旨集　2003　111-62　2003/11/20

Show all ︎Show first 5

Books and Other Publications 1

Crustal Permeability

T. Ishibashi, N. Watanabe, H. Asanuma, N. Tsuchiya

Wiley-Blackwell　2016/12

ISBN: 9781119166566

Presentations 64

Fracture and permeability of granite in superhot geothermal environments International-presentation Invited

N. Watanabe, K. Sakaguchi, H. Saishu, R. Goto, T. Ishibashi, A Okamoto, Y. Chen, S. E. Ingebritsen, T. Komai, N. Tsuchiya

ISRM2019 Specialized Conference The 5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future (YSRM2019 and REIF2019)　2019/12/03
Creating supercritical geothermal reservoirs by hydraulic fracturing and/or decompression fracturing

N. Watanabe, K. Sakaguchi, N. Hirano, A. Suzuki, R. Goto, T. Miura, L. Bailong, T. Ito, T. Komai, N. Tsuchiya, N. Watanabe, T. Ishibashi, H. Asanuma

Annual meeting of the geothermal research society of Japan　2019/11/21
Hydraulic fracturing of granite in superhot geothermal enviroments International-presentation

N. Watanabe, K. Sakaguchi, R. Goto, T. Miura, T. Komai, N. Tsuchiya, T. Ishibashi, Y. Chen

16th International Workshop on WATER DYNAMICS　2019/03/12
Hydraulic fracturing and permeability enhancement under supercritical geothermal conditions International-presentation

N. Watanabe, K. Sakaguchi, N. Tsuchiya, T. Ishibashi

15th International Workshop on Water Dynamics　2018/03/13
高温延性花崗岩の超臨界水による水圧破砕および透水性増加に関する室内実験

坂口清敏, 土屋範芳, 石橋琢也

日本地熱学会平成29年学術講演会　2017/10/18
延性地殻における透⽔性と超臨界地熱資源の形成可能性

沼倉達矢, 坂口清敏, 最首花恵, 岡本敦, Steven E. Ingebritsen, 土屋範芳

日本地球惑星科学連合2017年大会　2017/05/20
Hydraulic fracturing and permeability gain in high-temperature ductile granite International-presentation

M. Egawa, K. Sakaguchi, N. Tsuchiya

14th International Workshop on Water Dynamics　2017/03/17
Stress dependency of permeability in high temperature fractured granite International-presentation

M. Egawa, K. Sakaguchi

9th Asian Rock Mechanics Symposium　2016/10/18
封圧下高温き裂性花崗岩の浸透率

江川基樹, 坂口清敏, 土屋範芳

日本地球惑星科学連合２０１６年大会　2016/05/22
Permeability behavior of high-temperature fractured granite as a function of confining stress International-presentation

T. Numakura, K. Sakaguchi, N. Tsuchiya

13th International Workshop on WATER DYNAMICS　2016/03/15
Temperature and stress dependencies in permeability of fractured granite International-presentation

T. Numakura, K. Sakaguchi, N. Tsuchiya

12th International Workshop on WATER DYNAMICS　2015/03/09
Beyond-laboratory-scale prediction for channeling flows through subsurface rock fractures International-presentation

T. Ishibashi, N. Hirano, A. Okamoto, N. Tsuchiya

8th Asian Rock Mechanics Symposium　2014/10/14
Process design of hydrogen production via the sulfur redox cycle under mild hydrothermal condition International-presentation

P. Setiani, N. Tsuchiya

Grand Renewable Energy 2014 International Conference　2014/07/27
Overview of Fluid Flow through Rock Fracture International-presentation

11th International Workshop on WATER DYNAMICS　2014/03/12
Experimental and numerical determination of relative permeability curves for two-phase flow through a rock fracture under confining pressure International-presentation

Keisuke Sakurai, Takuya Ishibashi, Noriyoshi Tsuchiya

The 6th International Symposium on In-Situ Rock Stress　2013/08/20
GeoFlow を用いたき裂型貯留層における優先流路分布の評価

石橋琢也, 土屋範芳, 玉川哲也

平成２５年度石油技術協会春季講演会　2013/06/27
Field-scale fluid flow analysis by a novel fracture network model simulator, GeoFlow International-presentation

Takuya Ishibashi, Tetsuya Tamagawa, Noriyoshi Tsuchiya

10th International Work shop on WATER DYNAMICS and ICDP Japan Beyond-Brittle Project　2013/03/12
Relative Permeability Measurement and Numerical Modeling of Two-Phase Flow Through Variable Aperture Fracture in Granite Under Confining Pressure International-presentation

Keisuke Sakurai, Takuya Ishibashi, Noriyoshi Tsuchiya

2012 Geothermal Resources Council Annual Meeting　2012/09/30
Experimental and Numerical Investigation of Two-Phase Flow in a Fracture under Confining Pressure International-presentation

Keisuke Sakurai, Takuya Ishibashi, Noriyoshi Tsuchiya

The 18th Formation Evaluation Symposium of Japan　2012/09/27
封圧下のフラクチャーにおける二成分二相流に関する相対浸透率測定および数値モデリング

櫻井圭介, 石橋琢也, 土屋範芳

平成24 年度石油技術協会春季講演会　2012/06/06
X-ray CT imaging and hydrologic characterization of fractured core samples under stress

H. Ito, AMST

日本地球惑星科学連合2012年大会　2012/05/20
硫黄の水熱反応における水素生成に及ぼす温度とpHの影響

セティアニプトリ, 木下睦, 土屋範芳

日本地熱学会平成２３年学術講演会　2011/11/09
Development of CFR-PEEK core holder for X-ray CT based numerical analysis of fluid flow within fractured samples under confining pressure International-presentation

T. Ishibashi, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe, H. Ito

The 17th Formation Evalutation Symposium of Japan　2011/09/29
CFR PEEK製コアホルダを用いたX線CT測定によるき裂流体流動解析

土屋範芳, 大崎豊, 玉川哲也, 土屋慶洋, 岡部博, 伊藤久男

平成23年度石油技術協会春季講演会　2011/06/07
X-ray CT-based hydrogeological core analysis with CFR PEEK core holder

N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe, H. Ito

日本地球惑星科学連合2011年大会　2011/05/22
X線CTを利用した封圧下の貯留層コアサンプルにおけるき裂流体流動の可視化

石橋琢也, 平野伸夫, 土屋範芳, 大崎豊, 玉川哲也, 土屋慶洋, 岡部博

日本地熱学会平成22年学術講演会　2010/11/24
Analysis of fracture flow within reservior core sample under confining pressure by numerical modeling coupled with X-ray computed tomography International-presentation

T. Ishibashi, N. Hirano, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe

The 16th Formation Evaluation Symposium of Japan　2010/10/07
封圧下のX線CTに基づいた数値モデル解析による岩石き裂内流体流動の可視化

平野伸夫, 土屋範芳, 大崎豊, 玉川哲也, 土屋慶洋, 岡部博

資源・素材2010（福岡）　2010/09/13
Numerical Model Analysis of Fracture Flow Using X-ray CT Data

Y. Ohsaki, T. Tamagawa, N. Hirano, Y. Tsuchiya, H. Okabe, N. Tsuchiya

日本地球惑星連合科学連合2010年大会　2010/05/23
Three dimensional numerical modeling of fracture flow for rock core coupled with X-ray computed tomography International-presentation

Y. Ohsaki, T. Tamagawa, N. Hirano, Y. Tsuchiya, H. Okabe, N. Tsuchiya

World Geothermal Congress 2010　2010/04
岩石き裂の不均質間隙構造におけるチャネリングフロー

JAMSTEC IFREE-KANAME 特別セミナー　2010/03
Three dimensional numerical analysis of fluid flow through fractured rock core using X-ray computed tomography International-presentation

N. Hirano, N. Tsuchiya, Y. Ohsaki, T. Tamagawa, Y. Tsuchiya, H. Okabe

International Petroleum Technology Conference　2009/12/07
Utilization of X-ray computed tomography in three dimensional numerical modeling of fluid flow through fractured rock core International-presentation

Y. Ohsaki, Y. Tsuchiya, T. Tamagawa, N. Hirano, H. Okabe, N. Tsuchiya

The 15th Formation Evaluation Symposium of Japan　2009/10/01
Water soluble/insoluble fractions of bitumen at hydrothermal conditions inferred by direct observation using visible-type autoclave International-presentation

Y. Takeushi, T. Kayouda, A. Kishita

8th World Congress of Chemical Engineering　2009/08/23
X線CTを用いた岩石コア内部天然フラクチャーにおける流体流動の３次元モデリング

平野伸夫, 大崎豊, 玉川哲也, 土屋範芳

石油技術協会平成２１年度春季講演会　2009/06
不均質間隙構造を有する地下き裂系における３次元チャネリングフロー

石橋琢也, 平野伸夫, 岡本敦, 土屋範芳

日本地球惑星科学連合2009年大会　2009/05/16
Development of a Discrete Fracture Network Model Simulator for 3D Channeling Flow through Rock Fractures with Heterogeneous Aperture Distributions International-presentation

T. Ishibashi, N. Hirano, N. Tsuchiya

6th International Workshop on WATER DYNAMICS　2009/03/04
Utilization of Waste Seashell in Hydrothermal Synthesis of Hydroxyapatite International-presentation

Y. Enari, M. Kamitakahara, K. Ioku

IUMRS-ICA2008　2008/12/09
Hydrothermal Synthesis of Hydroxyapatite from Waste Seashell International-presentation

Y. Enari, M. Kamitakahara, K. Ioku

IUMRS-ICA2008　2008/12/09
廃貝殻の水熱処理による水酸アパタイトの合成と形態制御

江成祐樹, 上高原理暢, 井奥洪二

無機マテリアル学会第117回学術講演会　2008/11/13
Relationship between rate of aperture reduction and contact pressure of fracture in granite under hydrothermal condition International-presentation

H. Iijima, N. Hirano, N. Tsuchiya

Geothermal Energy 2008 Conference　2008/10/05
In-situ observation of heavy crude oil dissolution in water at supercritical condition International-presentation

Y. Takeuchi, J. Abe, A. Kishita, K. Ioku

The 1st International Solvothermal and Hydrothermal Association Conference 2008　2008/09/08
Role of supercritical watter for hydothermal cracking of bitumen International-presentation

A. Kishita, J. Abe

236th American Chemical Society National Meeting　2008/08/17
透水実験に基づく数値モデリングによる封圧下のフラクチャー間隙構造と流体流動の実態解明

平野伸夫, 土屋範芳, 北大, 環境科学

平成20年度石油技術協会春期講演会　2008/06/11
封圧下透水実験に基づく数値モデリングによる岩石き裂間隙と流路構造の評価

平野伸夫, 土屋範芳, 北大, 環境科学

日本地球惑星連合科学連合2008年大会　2008/05/25
超臨界水をもちいた重質油の低環境負荷アップグレーディングプロセス

竹内祐介, 木下睦, 井奥洪二, 北大, 環境科学

ネイチャーテクノロジー＆グリーンプロセスルネッサンス“連携シンポジウム” 自然に学ぶ21 世紀の環境調和型技術　2007/12/11
Observation of Flow Path Change in Rock Fracture under Hydrothermal Condition Using a Coupled Experimental-Numerical Method International-presentation

H. Iijima, Nobuo Hirano, Noriyoshi Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

Geothermal Resources Council 2007 Annual Meeting　2007/09/30
Experimental and Numerical Analysis of Flow Path Change in Rock Fracture under Hydrothermal Condition International-presentation

H. Iijima, N. Hirano, N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

5th International Workshop on WATER DYNAMICS　2007/09/25
Evaluation of aperture structure and fluid flow in shear fracture of granite using high-resolution numerical modeling technique International-presentation

N. Hirano, N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

4th International Workshop on WATER DYNAMICS　2006/11
高分解能数値モデリング手法による花崗岩せん断き裂の間隙構造と流体流動の評価

平野伸夫, 土屋範芳, 北大院, 環境科学

日本地熱学会平成18年度学術講演会　2006/11
Experimental evaluation of fluid flow through artificial shear fracture in granite International-presentation

N. Hirano, N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

Geothermal Resources Council 2006 Annual Meeting　2006/09
封圧の増加にともなうせん断フラクチャーの透水性と流路構造の変化

平野伸夫, 東北大院, 環境科学, 鈴木健一郎, 玉川哲也, 手塚和彦, 土屋範芳, 北大, 環境科学

石油技術協会平成18年度春季講演会　2006/05
花崗岩せん断き裂の透水性と表面形状に基づく断層内流体流路とアスペリティのモデル化

平野伸夫, 土屋範芳, 北大, 環境科学

東京大学地震研究所特定共同研究A「地震発生の素過程」研究集会　2006/03
High resolution modeling of aperture structure and flow path in rock fracture International-presentation

N. Hirano, raduate School of Environmental Studies, Tohoku University, T. Tamagawa, K. Tezuka (JAPE, N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

3rd International Workshop on WATER DYNAMICS　2005/11
岩石き裂内部間隙構造と流体流路の高分解能モデリング

平野伸夫, 北大院, 環境科学, 玉川哲也, 手塚和彦, 土屋範芳, 境科学

資源・素材学会東北支部平成17年度秋季大会　2005/10
Numerical estimation of aperture structure and flow wetted field in rock fracture International-presentation

N. Hirano, raduate School of Environmental Studies, Tohoku University, T. Tamagawa, K. Tezuka (JAPE, N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

Geothermal Resources Council 2005 Annual Meeting　2005/09
Permeability measurement for large rock fracture using rubber-confining pressure vessel International-presentation

N. Hirano, N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

26th Annual New Zealand Geothermal Workshop　2004/12
Development of rubber-confining pressure vessel (R-CPV) and permeability measurement of granite rock fracture International-presentation

N. Hirano, N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

2nd International Workshop on WATER DYNAMICS　2004/12
ゴム弾性封圧装置を用いた岩石き裂の透水性評価

平野伸夫, 東北大院, 環境科学, 玉川哲也, 手塚和彦, 土屋範芳, 北大, 環境科学

日本地熱学会平成16年度学術講演会　2004/12
Hydrothermal channel flow through tensile fracture in granite International-presentation

N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

1st International Workshop on WATER DYNAMICS　2004/03
封圧下における岩石き裂内のチャネリングフロー

平野伸夫, 土屋範芳, 北大, 環境科学

東北大学地球科学COE研究集会「地震発生帯での岩石－水相互作用」　2004/03
岩石き裂の間隙構造と流体流動特性

平野伸夫, 土屋範芳, 北大院, 環境科学

日本地熱学会平成15年度学術講演会　2003/11
Experimental and numerical analysis of hydrothermal channel flow through a tensile fracture in granite International-presentation

N. Tsuchiya, Graduate School of Environmental Studies, Tohoku Universit

Geothermal Resources Council 2003 Annual Meeting　2003/10
岩石き裂内の熱水チャンネルフローとき裂間隙幅変化

日本地熱学会平成14年度学術講演会　2002/11

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Industrial Property Rights 14

岩石中の金属成分溶解方法、地中への二酸化炭素貯留方法、および二酸化炭素固定方法

渡邉則昭, ワンジャジェ, 岡本敦, 堰合涼太

特許第7726549号

Property Type: Patent

Holder: 国立大学法人東北大学
炭化水素化合物からの水素製造方法

渡邉則昭, 木下睦, 土屋範芳, 河島義実, 梅木孝, 福永哲也

Property Type: Patent
精製リチウムの製造方法

渡邉則昭, ワンジャジェ

Property Type: Patent
金属化合物の回収方法および金属化合物の回収装置

渡邉則昭, ワンジャジェ, 三山凌, 坂本和寛, 進藤学, 小林彪雅

Property Type: Patent
岩盤破砕方法及びそれを用いた貯留層造成方法

渡邉則昭, 坂口清敏, 詫間康平

Property Type: Patent
水圧破砕法

渡邉則昭, 渡辺優斗, 小幡凪

Property Type: Patent
金属成分及び陰イオン成分の回収方法

渡邉則昭, ワンジャジェ

Property Type: Patent
岩石中の成分の溶解方法、地中への二酸化炭素の貯留方法、二酸化炭素の固定方法、地中への流体の貯留方法、原油の回収方法、及び、天然ガスの回収方法

渡邉則昭, ワンジャジェ, 田村諒太, 平野ひとみ, 玉川哲也

Property Type: Patent
二酸化炭素固定方法、二酸化炭素回収方法、並びに二酸化炭素固定装置及びこれを備えた環境配慮型産業設備

渡邉則昭, ワンジャジェ

Property Type: Patent
二酸化炭素固定方法及び二酸化炭素固定装置

渡邉則昭, ワンジャジェ, 佐藤王高, 公文翔一

Property Type: Patent
岩盤の多方向破砕方法および岩盤の多方向破砕装置

椋平祐輔, 渡邉則昭, 後藤遼太

Property Type: Patent
岩盤破砕方法及びそれを用いた貯留層造成方法

渡邉則昭, 坂口清敏, 詫間康平

Property Type: Patent
A carbon dioxide storage method, carbon dioxide recovery method, carbon dioxide storage equipment, and environment-friendly industrial equipment

Noriaki Watanabe, Jiajie Wang, Noriyoshi Tsuchiya

特許7345791

Property Type: Patent
A combined stimulation method of geothermal reservoirs and scale removal method in wells

Noriaki Watanabe, Kaori Takahashi, Tetsuya Tamagawa, Kohei Akaku, Yusuke Kumano

特許7115692

Property Type: Patent

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Research Projects 25

Sustainable Hydrogen Production Process by Cyclic Redox of Sulfur Competitive

System: Cooperative Research

2009/04 - Present
Calcium Phosphate as Ecomaterial and Biomaterial Competitive

2007/11 - Present
Upgrading of Heavy Oil Using Super Critical Water Competitive

2007/04 - Present
Fluid Flow in the Earth's Crust Competitive

2002/04 - Present
Enhanced CO2 geological storage and mineralization in basalt using biodegradable chelating agents

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2024/04 - 2029/03
Reveration from in-situ Stress: Development of Multidirectional Hydraulic Fracturing Method and Establishment of Fracture Modes

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04/01 - 2028/03/31
A New Chemical Stimulation Method for Geothermal Reservoirs: Selective Mineral Dissolution with Environmentally Friendly Chelating Agents

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2022/04/01 - 2027/03/31
Innovative Resource Recycling Use of Woody Biomass Ash and Nutrient Dynamics Analysis: New Developments for Sustainable Agriculture

Offer Organization: Bio-oriented Technology Research Advancement Institution (BRAIN)

2024/09 - 2027/03
Generation of CO2 fluid and mantle carbonation in subduction zones

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2022/04 - 2027/03
地熱貯留層の新化学的刺激法：環境調和型キレート剤による選択的鉱物溶解

渡邉則昭, WANG JIAJIE

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2022/04 - 2027/03
超低粘度流体による岩石破砕現象の解明とCO2利用／誘発地震抑制型地熱開発への応用

渡邉則昭, 坂口清敏

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的研究(開拓)

Institution: 東北大学

2021/07 - 2027/03

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近年の研究により，超臨界地熱資源は大陸地殻の大部分を占める花崗岩質岩石内でも形成されることがわかったが，生産に必要な透水性が十分でない場合に対応するための人工き裂システム形成法が必要とされている。研究代表者らはこれまでに，花崗岩の超高温水圧破砕実験を実施し，従来型の水圧破砕とは全く異なる，抽熱に有利な高透水性網状き裂を形成する超高温水圧破砕（比較的低い水圧でき裂が形成され，誘発地震のリスクが小さい）を解明し，水圧破砕に関する新しい学術体系を創出した。その結果，超高温でなくとも超低粘度の流体（例えば，CO2）を用いた場合，より低温の在来型地熱環境でも網状き裂が形成できる可能性を見出した。本研究では，CO2を用いた岩石破砕実験等を通じて，広範な地熱環境における超低粘度流体による岩石破砕現象と，本現象を利用したCO2利用／誘発地震抑制型・高透水性網状き裂システム形成法に関する新学術を開拓することを目的とする。本年度は当初計画通り，花崗岩の水圧破砕に関する先行研究で用いた200℃～450℃の実験条件において，常に粘度が100μPa・s 以下となるCO2を破砕流体とした花崗岩の破砕実験を実施し，破砕流体の粘度が極めて小さい場合，温度とは無関係に網状き裂が形成されることを検証できた。さらに当初計画以上に研究が進展し，網状き裂の特徴の温度や応力条件による変化の程度およびメカニズムを明らかにすることができた。加えて，CO2を破砕流体とした場合，比較的低い圧力で広範囲に熱抽出に有利な高密度き裂ネットワークを形成できるものの，比較的低温の場合には，き裂の密度や開口幅が小さくなるという課題が明らかになったため，この課題を解決しうる環境調和型キレート剤を用いた選択的鉱物溶解によるき裂開口幅増大法の検討を開始した。
Development of sequential self-healing cement-based barrier for confining the nuclides in a groundwater saturated field

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2021/04 - 2025/03
Innovative study on new energy development with carbon storage using reaction field in super-critical geothermal reservoir

Komai Takeshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2019/06 - 2022/03

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A novel reaction process that enables the generation of hydrogen and hydrocarbons as well as a CO2 reduction mechanism by utilizing a georeactor (underground reactor) that utilizes the high temperature and high pressure reaction field of supercritical geothermal water was theoretically and experimentally investigated. Theoretical support was provided to derive new breakthroughs in the energy and environmental fields by fabricating a reactor that assumes a sophisticated and high-performance georeactor. Experimental results using a wide variety of minerals and catalysts showed that natural minerals such as olivine, pyroxene, and spinel can produce high concentrations of hydrogen when reacted under CO2-rich environmental conditions. Furthermore, since carbonate minerals were produced as reaction products, CO2 sequestration could be achieved at the same time.
Permeability behavior in high-temperature ductile crust and prediction of spatiotemporal evolution in supercritical geothermal resource

Watanabe Noriaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2017/04 - 2022/03

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The scale and characteristics of new geothermal resources, "supercritical geothermal resources", which consist of fractured rocks containing supercritical water, are highly dependent on the permeability of the intrusive rocks and its host rocks. On the other hand, it has been suggested that the permeability may change drastically due to changes in mechanical properties or rocks such as the brittle-ductile transition, and fast, nucleation-type precipitation associated with fluid phase changes, but the details are unknown. In this study, we derived model equations of permeability behaviors involving changes in the mechanical properties of rocks and phase changes of fluids through laboratory experiments, and clarified the possibility of a prediction method of spatio-temporal evolution of supercritical geothermal resources by conducting spatio-temporal evolution simulations.
A method to create a dense fracture network utilizing hydrofracturing phenomenon by supercritical water in the high-temperature ductile crust

Watanabe Noriaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2018/06 - 2021/03

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We aimed to create a new scientific field for hydraulic fracturing of subsurface rocks based on results from a set of the first-ever hydraulic fracturing experiments on granite under true triaxial stress state at supercritical temperatures of water, with consideration for the formation environments of supercritical geothermal resources. We systematically and quantitatively investigated influences of various factors (temperature, stress state, fluid injection rate and so on) on fracture pattern and permeability enhancement for granite, and developed a fundamental theory of supercritical hydraulic fracturing which can be applied to a new method to create high-permeability cloud-fracture networks.
Visualization of water flow in column based on measurement of porosity distribution and impact assessment of harmful matter elution

Nakamura Kengo, WATANABE Noriaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Research Activity Start-up

Institution: Tohoku University

2015/08 - 2017/03

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This study is visualized soil structure of porosity distribution and water flow inside of ISO/CEN column test by using the X-ray CT using 3 types soil samples. It is discussed that forming pathway and dissolution mechanisms in column. Water flow in column is made difference of each soil. Toyoura Sand and Decomposed Granite were formed excellence flow path in the vicinity of the tube center. On the hand, Kanto Loam was caused a excellence flow path in the vicinity of the tube wall. The conventional column test is suggested that water flow is different by soil to be used. Thus, it is possible that each column test are caused different the liquid-solid ratio and dispersion in column to filled soil by Physico-chemical characteristics of the soil.
Analysis of poromechanics in sandstone reservoir containing supercritical CO2 and water using X-ray CT under stress

Watanabe Noriaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2014/04 - 2017/03

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In geologic sequestration of carbon dioxide (CO2), it is important to understand poromechanics for reservoirs consisting of porous rocks such as sandstone. It is required to quantitatively understand and formulate dependencies of poroelastic parameters on confining pressure, pore pressure, CO2 saturation and temperature, for reservoirs, because inversion techniques utilizing changes in elastic wave velocities, and tilt data of the ground surface, associated with migration of CO2, are based on the poroelastic theory. The present study has quantitatively revealed poroelastic parameters of sandstones containing water and supercritical CO2 via laboratory experiments including noiseless X-ray CT on sandstones under stress.
Quantitative evaluation of earthquake induced phenomena based on fixed point measurement of shallow crustal stress

Sakaguchi Kiyotoshi, YOKOYAMA Tatsuya, Lin Weiren

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2014/04 - 2017/03

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To examine the change in in-situ stress between before and after the 2011 Tohoku-oki earthquake, we performed stress measurements after the earthquake in the Kamaishi mine, located near the northern termination of the mainshock rupture. The in-situ stress measurement period was from 1991 to 2017. The results showed that the magnitudes of the three-dimensional principal stresses and the vertical stress drastically increased during the mainshock and, at one year after the earthquake, were more than double those before the earthquake. The principal stress magnitudes then decreased with time, and returned almost to the pre-earthquake levels at about five years after the earthquake. The increasing and decreasing trends in stress in the Kamaishi mine can be interpreted in terms of the effects of coseismic rupture behavior of the Tohoku-oki earthquake mainshock and the occurrence of aftershocks in the Sanriku-oki low-seismicity region (SLSR), where the Kamaishi mine is located.
Fundamental study on mineral vein formation by sealing experiment of rock fracture

Atsushi Okamoto, Muto Jun, Yamada Ryo, Saishu Hanae, Tanaka Hiroto, Wendler Frank

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2014/04 - 2017/03

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A new hydrothermal flow-through apparatus was developed, which enables us to investigate the dissolution and precipitation processes of fractured rocks at sub to supercritical conditions under confining pressure, and the evolution of aperture structures by X-ray CT. In the dissolution experiments of fractured granite, large pores and preferential flow paths were created by rapid dissolution of quartz and gauge parts, suggesting that formation of large fluid pockets induced by water-rock interaction within the crusts. In silica precipitation experiment at supercritical condition, amorphous silica precipitated at the inlet, which caused fracture sealing effectively, compared to quartz overgrowth from the fracture walls. The fracture sealing by silica precipitation produced a characteristic fluid pressure oscillation, which may indicate an importance analogue of the cycle of silica precipitation - fluid pressure rise (earthquake).
Science and Technology of Geothermal Energy Frontier

TSUCHIYA Noriyoshi, ASANUMA Hiroshi, OKMOTO Atsushi, SAKAGUCHI Kiyotoshi, WATANABE Noriaki, HIRANO Nobuo, KIZAKI Akihisa, MORIYA Hirokazu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Specially Promoted Research

Institution: Tohoku University

2013 - 2017

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Geological models and the properties of supercritical geothermal reservoirs are described with respect to supercritical geofluids, mechanical behaviors of reservoir rocks, crustal permeability and tectonic settings. Mechanical conditions at the elastic-plastic boundaries of granitic rocks indicate potentially exploitable supercritical geothermal resources. Tensile fracturing is possible even in ductile rocks, and some permeability-depth relations proposed for the continental crust show no drastic permeability reduction at the BDT (Brittle-Ductile Transition). The reservoir permeability (>10^[-16] m^2) could be maintained even under supercritical conditions. The permeable-impermeable boundary of the crust and geothermal reservoirs were affected by water-rock interaction such as dissolution and precipitation of silica minerals. NE Japan is representative of an Island-Arc setting in a subduction system, and it is highly possible that exploitable supercritical geothermal resources may be located on and around the present volcanic front.
Investigation of fluid flow through a cleat network in coal and its application to CO_2-ECBM/S

WATANABE Noriaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (A)

Institution: Tohoku University

2011 - 2012

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The main objective of the present study was to clarify two-phase flow characteristics of a cleat (fracture) network in coal, for applications to the CO2-ECBM/S. Two-phase flow experiments and model simulations on mated fractures revealed relative permeability curves of fractures, which were entirely different from existing models, suggesting necessity of further studies on two-phase flows through fractures.
Mechanisms of hydrogen production in hydrothermal reactions of sulfur and its application to a sustainable hydrogen production using geothermal energy

WATANABE Noriaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2011 - 2012

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A new method of hydrogen (H_2) production was proposed. This method consists of H_2 production from water, with sulfide as a reducing agent of water, and sulfide regeneration, with biomass (e.g., glucose) as a reducing agent of S_n^<2-> and S_xO_y^<2->. Laboratory experiments revealed H2 production at pH 9-13 and 280-320 ℃, and sulfide regeneration at -60℃.
X線CTを利用した断層掘削コアの数値モデル化と流体流動解析

渡邉則昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2010 - 2011

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近年の断層掘削により、断層帯が複雑な構造を持ち、浸透率も時空間的に大きく変化することが明らかになりつつあるようであるが、断層帯の水理特性の原位置測定の標準的な手法はいまだ確立されておらず、従来の孔井を利用した測定手法のみでは比較的長い区間の平均的な浸透率しか得られない。そこで本研究では、X線CT測定を利用することで、原位置コアサンプルの浸透率や空隙率を測定でき、さらにフラクチャーネットワークにおける複雑な流体流動も簡便に解析できる数値モデル解析手法を新たに考案した。昨年度、人工単一フラクチャーもしくは天然複数フラクチャーを有する花崗岩サンプルを対象に、大気圧下での医療用X線CT測定を利用したフラクチャー開口幅の精密測定に基づくサンプルの数値モデル化および流体流動解析を実施した。その結果、数値モデルは空隙率の実測値を再現できること、流体流動解析も浸透率の実測値を再現でき、さらに三次元的に発達する複雑な流路を明瞭に可視化できることを示すことができた。しかしながら、原位置コアを対象とした場合を想定し、市販のコアホルダ(圧力容器)を使用した封圧下のX線CT測定を実施し、人工もしくは天然の単一フラクチャーを有する花崗岩サンプルの数値モデル化と流体流動解析を試みた場合には、市販のコアホルダではノイズが大きく定量的に正しい結果を得られることは困難であることが明らかになった。そこで本年度、新たに炭素繊維充填PEEK製コアホルダを開発した。その結果、封圧下においても大気圧下と同等以上の質でのX線CT測定が可能となり、市販のコアホルダでは極めて困難であった封圧下のフラクチャーを有するサンプルの数値モデル化および流体流動解析が容易になった。すなわち、X線CTを利用した断層掘削コアの数値モデル化と流体流動解析手法の基礎を確立できた。
Preparation of bioresorbable bone substitutes incorporated in bone metabolism

IOKU Koji, IKEDA Tohru, KAMITAKAHARA Masanobu, WATANABE Noriaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2009 - 2011

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A fabrication process of Ca-deficient HA with controlled composition and morphology of the particles which construct the HA ceramics was established by selecting the starting material and hydrothermal conditions. The possibility that the Ca-deficient composition and morphology of the particles affect the behavior of the HA ceramics in vivo was revealed. Moreover, it was revealed that the rod-shaped particles prevent the brittle fracture. From these results, we obtained the basic knowledge about the creation of bioresorbable bone substitute materials.
水酸アパタイトマイクロチューブの創製

井奥洪二, 上高原理暢, 渡邉則昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的萌芽研究

Institution: 東北大学

2009 - 2010

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水酸アパタイトの特徴を活かす材料として、チューブ状の水酸アパタイトを創製できれば、従来にないDrug Delivery System(DDS)や高効率の化学物質回収材料等として応用展開できる可能性がある。昨年度までに、アナターゼのナノ粒子をリン酸三カルシウム粉末と混合し、この混合粉末からなるペレットを水熱蒸気処理すると、柱状の水酸アパタイト粒子に混ざって、水酸アパタイトマイクロチューブが生成していることを発見した。本年度は、水酸アパタイトマイクロチューブの生成メカニズムの解明を目指し、まず添加するアナターゼの粒径や量の影響について調べた。その結果、ある特定の粒径でしかも特定の量のアナターゼを添加した場合にのみ、水酸アパタイトマイクロチューブが生成することを明らかにした。さらに、水酸アパタイトマイクロチューブが生成する系においてマイクロチューブ生成過程を詳細に調べたところ、まずリン酸三カルシウムと水が反応し、チューブ形状を取らない水酸アパタイトが生成し、その後結晶成長の段階でチューブ状になっていることが示唆された。すなわち、アナターゼが結晶成長に影響を与え、これにより水酸アパタイトマイクロチューブが生成している可能性を明らかにした。さらに、透過型電子顕微鏡観察により、生成した水酸アパタイトマイクロチューブは、c軸方向に成長し、a面と呼ばれる特定の結晶面を露出していることが示唆された。特定の結晶面の露出は、水酸アパタイトに吸着特性の選択性を付与する可能性がある。これらの成果は水酸アパタイトマイクロチューブの生成メカニズムの解明や大量生産につながるものと期待できる。

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Social Activities 1

国連大学グローバルセミナー

2009/11/21 - 2009/11/23

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実行委員

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高温延性岩体における超臨界水圧破砕挙動と多孔質体型き裂システム形成法

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新・地熱資源“超臨界地熱資源”の開発・生産に向けて，最高温度500℃，最大三軸応力150 MPaの条件下の花崗岩に対して，おそらく世界初となる超臨界水圧破砕実験を実施し，き裂形成挙動および浸透率獲得の特徴と，人工き裂システム形成法，特に抽熱に有利な小規模き裂が三次元的に分布した多孔質体型き裂システム形成法に関する基礎的知見を得る。
土壌中における卓越流路の特性および汚染土壌のカラム溶出試験に対する影響

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地盤環境を適切かつ合理的に管理していくためには，土壌からの汚染物質の溶出特性を理解する必要がある。現在，我が国においては，バッチ式溶出試験が主に用いられているが，実環境の再現が期待できるカラム溶出試験（流通式試験）も活用されはじめている。一方，最新の土壌水理学的な研究によれば，『土壌中の流体流動現象は卓越流路の形成で特徴付けられる』。すなわち，土壌の孔隙システムは不均質性を有しており，流体は流動抵抗の小さなパスを選択的に流動するため，卓越流路が形成され，流体流動に寄与する孔隙は全孔隙の一部のみであると考えられる。しかしながら，土壌中での三次元的な卓越流路の形成の定量的な知見は乏しく，卓越流路の形成がカラム溶出試験に及ぼす影響は不明である。そこで本研究では，申請者がこれまでに培ってきた岩石中での卓越流路の可視化および評価法，特にX線CTを用いた手法，を土壌水理学分野へ展開・応用し，土壌中での卓越流路の形成を可視化および評価し，加えて，カラム溶出試験に及ぼす影響を明らかにすることを目的とする。
炭酸塩岩における流体流動に関する研究

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複数の炭酸塩岩を対象とした流動実験および数値シミュレーション
温泉熱を利用した水素製造に関する研究

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温泉水-アルミニウム廃棄物反応による地産地消・小規模分散型水素製造技術の実現可能性に関する研究
流動実験および数値モデル解析による封圧下の岩石フラクチャーにおける二相流動特性の解明

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フラクチャー型油ガス貯留層あるいは地熱貯留層への応用を念頭に、封圧下の花崗岩あるいは炭酸塩岩中フラクチャーに対する流動実験を実施し、毛細管圧力と相対浸透率の関係を明らかにする。加えて、本実験を再現可能なミクロスケール二相流動モデルを開発し、実験では測定困難な飽和率を決定することで、毛細管圧力、飽和率および相対浸透率の関係を明らかにする。
地熱や廃熱による硫黄の水熱Redoxサイクルを通じたバイオマスからの水素製造

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エネルギー供給、環境保全、経済成長の同時達成の観点から、長期的に化石資源以外からの水素製造法の確立が望まれている。このような水素製造法の一つとして、バイオマス（主にグルコース）と水を高温下で処理し、水素を製造する方法が注目されている。しかしながら、理想的には1molのグルコースから12molの水素が得られるはずが、触媒を使用した高温（500℃）処理であっても水素生成量は2molにも満たない。そこで申請者らは、より低温で進行する硫黄の酸化還元サイクルを通じたバイオマスからの水素製造法を考案した。すなわち、①石油精製または地熱地帯で生じる硫化水素を溶解させた水を、工場排熱または地熱を利用して300℃程度に加熱することにより、硫化水素で水を還元し水素を製造する工程と、②消費（酸化）された硫化水素を、還元性バイオマス（主にグルコース）を用い100℃程度で再生する工程を組み合わせた、全く新しい水素製造法である。この水素製造法に関しては、280℃～320℃での水素生成や、100℃以下での硫黄還元を実証しているものの、これまでに例のない水素生成反応に関しては、未解明な部分がある。本研究では、広範な条件での実験と精緻な分析により、水素生成反応に及ぼす各種パラメータの影響を評価し、速度論的数理モデルシミュレータを構築することによって、最適水素生成反応条件を明らかにする。
工場排熱や地熱による硫黄の酸化還元サイクルを通じたバイオマスからの水素製造

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エネルギー供給、環境保全、経済成長の同時達成の観点から、長期的に化石資源以外からの水素製造法の確立が望まれている。このような水素製造法の一つとして、バイオマス（主にグルコース）と水を高温下で処理し、水素を製造する方法が注目されている。しかしながら、理想的には1molのグルコースから12molの水素が得られるはずが、触媒を使用した高温（500℃）処理であっても水素生成量は2molにも満たない。そこで申請者は、より低温で進行する硫黄の酸化還元サイクルを通じたバイオマスからの水素製造法を考案した。すなわち、①石油精製または地熱地帯で生じる硫化水素を溶解させた水を、工場排熱または地熱を利用して300℃程度に加熱することにより、硫化水素で水を還元し水素を製造する工程と、②消費（酸化）された硫化水素を、還元性バイオマス（主にグルコース）を用い100℃程度で再生する工程を組み合わせた、全く新しい水素製造法である。この革新的水素製造法に関しては、硫化水素を含有する熱水（280℃～320℃）からの水素生成や、グルコースを用いた100℃以下での硫黄還元を実証しているものの、特にこれまでに例のない水素生成反応に関しては、未解明な部分が多く残っている。そこで本研究では、広範な条件での実験と精緻な分析に基づいて水素生成メカニズムを明らかにする。具体的には、急速昇温・冷却を可能とする反応容器を用いて、水素生成反応に及ぼす各種パラメータの影響を評価し、速度論的数理モデルシミュレータを構築することによって、最適水素生成反応条件を明らかにする。
地熱や廃熱による硫黄サイクルを通じたバイオマスからの水素製造技術の開発

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エネルギー供給、環境保全、経済成長の同時達成の観点から、長期的に化石資源以外からの水素製造技術の確立が望まれている。本技術は、①地熱地帯または石油精製で生じる硫化水素を溶解させた水を、地熱または廃熱を利用した加熱により、硫化水素で水を還元し水素を製造する工程と、②消費(酸化)された硫化水素をバイオマス(グルコース等)で再生(還元)する工程を組み合わせた、水素製造技術である。本申請では、両反応工程を精度良く再現できる装置作製と実験実施に加え、速度論的数理モデルシミュレータ構築により、水素製造条件の最適化を図る。本技術完成により、被災地域の地熱資源やバイオマスを積極的に利用した水素製造の展開が期待できる。
GeoFlowを用いたき裂型貯留層における優先流路分布の評価と校井ロケーションの最適化

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勇払油・ガス田では、AEおよび坑井データと調和的なDFNモデルに基づく生産シミュレーションが実施されたが、坑井間の生産能力の差が説明できていない。そこで独自に開発した新コンセプトのDFNモデルシミュレータGeoFlowによる優先流路分布の評価等を通じてこの現象の解明に挑戦する。また、き裂型貯留層におけるき裂分布、応力場および優先流路分布との関係性を明らかにし、坑井ロケーションの最適化を検討する。
地下き裂中での水酸アパタイト多孔体合成による汚染地下水反応性バリアの形成

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地下き裂中で水酸アパタイト多孔体を合成し、汚染地下水の反応性バリアとする技術の開発に関する研究
アルカリ水熱反応を利用した硫黄の循環的酸化還元による水からの持続的水素生成

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250℃以上のアルカリ熱水中では硫化水素（HS-）を還元剤として水から水素が生成するが、同時にHS-からS2O32-やSO32- が生成するため、水素生成はやがて停止する。しかし申請者らの研究グループは近年、この系に還元性のある有機物（バイオマス）を連続的に投入することでS2O32-やSO32-からHS-を再生し、持続的に水素生成ができる可能性を見出した。そこで本研究では、水熱反応を利用した硫黄の循環的酸化還元による水からの持続的水素製造プロセスを提案し、その実現に向けた基礎的研究を実施する。
き裂間隙構造の不均質性を考慮した精密貯留層モデリングと適正生産プロセス検討

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本邦勇払やベトナム国ランドンに代表される「き裂型油ガス貯留層」に関して、貯留層を構成する重要な要素であるき裂の間隙構造について、寸法依存性を実験的に明らかにした上で既存のDiscrete Fracture Network（DFN）モデルに組み込み、貯留層の精密モデリングを実施する。これにより、流路構造の三次元化など貯留層の実態把握を試み、き裂型貯留層の適正生産プロセスに関する基礎的検討を実施する。
き裂型貯留層の高度開発技術にむけたき裂内卓越流路検出法の検討

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き裂内に発生する卓越流路を検出する方法の数値シミュレーションによる検討

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