Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG58] Brittle-Ductile Transition and Supercritical Geofluids for Crustal Energy in Island Arc

Thu. May 30, 2019 1:45 PM - 3:15 PM A09 (TOKYO BAY MAKUHARI HALL)

convener:Noriyoshi Tsuchiya(Graduate School of Environmental Studies, Tohoku University), Hiroshi Asanuma(AIST), Yasuo Ogawa(Volcanic Fluid Research Center, School of Science, Tokyo Institute of Technology), Shigemi Naganawa(Akita University), Chairperson:Noriyoshi Tsuchiya, Atsushi Okamoto

1:45 PM - 1:55 PM

[SCG58-01] Supercritical Geothermal Resources as a Function of Mass and Energy Transport in Subduction Zone

*Noriyoshi Tsuchiya1 (1.Graduate School of Environmental Studies, Tohoku University)

Keywords:geothermal, subduction zone, energy transport, supercritical

Our research group is conducting fundamental and engineering studies of “Supercritical Geothermal Development”. Fracture networks and their formation mechanisms would be studied by using petrological and fluid inclusion studies in order to understand the geological model of a supercritical geothermal reservoir. The granite-porphyry system provides useful information for understanding supercritical geothermal reservoirs and EGS technology as novel energy system in subduction zone.
Hydrothermal experiments under supercritical conditions were performed by using tri-axial machine. Fracture cloud could be formed and permeability was enhanced in supercritical conditions.
Selected References as follow:
[1] Noriaki Watanabe, Kiyotoshi Sakaguchi, Ryota Goto, Takahiro Miura, Kota Yamane, Takuya Ishibashi, Youqing Chen, Komai Takeshi and Noriyoshi Tsuchiya, “Cloud-fracture networks as a means of accessing superhot geothermal energy”, Scientific Reports Scientific (2019), 10.1038/s41598-018-37634-z
[2] Fajar F Amanda, Ryoichi Yamada, Masaoki Uno, Satoshi Okumura adn Noriyoshi Tsuchiya, “Evaluation of Caldera Hosted Geothermal Potential during Vaolcanism and Magnetism in Subduction System, NE Japan” ,Geofluids (2019).
[3] Batkhishig, B., Bignall, G., Tsuchiya, N. "Hydrothermal quartz vein formation, revealed by coupled SEM-CL imaging and fluid inclusion microthermometry: Shuteen Complex, South Gobi, Mongolia." Resource Geology, (2014), 55, 1-8.
[4]Tsuchiya, N., Yamada, R., and Uno, M. "Supercritical geothermal reservoir revealed by a granite–porphyry system." Geothermics, 63, (2016), 182-194.
[5]Watanabe, N., Hirano, N. & Tsuchiya, N. "Determination of aperture structure and fluid flow in a rock fracture by a high-resolution numerical modeling on the basis of a flow-through experiment under confining pressure." Water Resource Research, 44, (2008), W06412 .
[6]Watanabe, N., Hirano, N., Tsuchiya, N. "Diversity of channeling flow in heterogeneous aperture distribution inferred from integrated experimental-numerical analysis on flow through shear fracture in granite." J. Geophysical. Research, 114, (2009), 10.1029/2008JB005959.
[7]Ishibashi, T., Watanabe, N., Asanuma, H., and Tsuchiya, N. "Linking microearthquakes to fracture permeability." Geophysical Research Letters, (2016), 10.1002/2016GL069478.
[8]Watanabe, N., Numakura, T., Sakaguchi, K., Saishu, H., Okamoto, A., Ingebritsen, S. E. and Tsuchiya, N. "Potentially exploitable supercritical geothermal resources in the ductile crust." Nature Geoscience, (2017), 10.1038/NGEO2879.
[9]Saishu, H., Okamoto, A., and Tsuchiya, N. "Mineralogical variation of silica induced by Al and Na in hydrothermal solutions." American Mineralogist, 97, (2012), 2060-2063.
[10]Saishu, H., Okamoto, A., and Tsuchiya, N. "The significance of silica precipitation on the formation of the permeable–impermeable boundary within Earth’s crust, Terra Nova, 26, (2014), 253-259.