World Geothermal Congress 2020+1
March - October, 2021

Japanese Supercritical Geothermal Project for Drastic Increase of Geothermal Power Generation in 2050

Hiroshi ASANUMA, Toru MOGI, Noriyoshi TSUCHIYA, Noriaki WATANABE, Shigemi NAGANAWA, Yasuo OGAWA, Yasuhiro FUJIMITSU, Tatsuya KAJIWARA, Kazumi OSATO, Kuniaki SHIMADA, Seiki HORIMOTO, Takashi SATO, Shigeto YAMADA, Kimio WATANABE

[FREA, AIST, Japan]

Japanese scientists have estimated that nationwide potential of Supercritical Geothermal Resources, which has an origin in subduction of oceanic plates, reaches hundreds GWs in Japan. Power generation using supercritical geothermal resources in Japan can significantly contribute to energy security and reduction of emission of CO2. Temperature range of the target supercritical rock body is around 400-500 deg-C and depth is expected to be less than several kilometers. The depth of the supercritical rock body is much shallower than the most of the other area in the world, and it brings advantages in accessibility, economy, and safety. However, there are a lot of scientific unknowns about the nature, especially in rock-mechanical and geo-chemical behavior under supercritical conditions. We also need technological breakthroughs, because temperature and pressure conditions in the supercritical geothermal systems are far beyond the current technological limitations and experiences in the foregoing ultra-high temperature geothermal drillings suggests that presence of acidic geothermal fluid should be expected. Japanese government identified power generation from supercritical geothermal resources as one of the key technologies in their strategy to drastically reduce emission of CO2 in/after 2050 (NESTI2050), and studies to identify the best location for proof-of-concept borehole, engineering investigation to extract thermal energy, simulation of fracture creation in supercritical rock body etc., have been underway as the NEDO-funded national projects from FY2018. Outline of outputs from the study will be presented in the final paper.

        Topic: Advanced Technology (Magma, Geopressure, etc.) Paper Number: 37002

         Session 42C: Advanced Technology 1 [Tuesday 6th July 2021, 10:00 am] (UTC-8)
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