Fracture and permeability of granite in superhot geothermal environments

Noriaki Watanabe, Kiyotoshi Sakaguchi, Hanae Saishu, Ryota Goto, Takuya Ishibashi, Atsushi Okamoto, Youqing Chen, Steven E. Ingebritsen, Takeshi Komai, Noriyoshi Tsuchiya

研究成果: Conference contribution

抄録

Assuming that the brittle–ductile transition (BDT) drastically reduces rock permeability, potentially exploitable geothermal resources (permeability: >10-16 m2) consisting of supercritical water or superheated steam (>~400 °C) could occur only in rocks with unusually high transition temperatures such as basalt. However, fracturing is possible even in ductile rocks, and some permeability–depth relations proposed for the continental crust show no drastic permeability reduction due to the BDT. Here we introduce our published results of permeability measurements on high-temperature fractured granite, suggesting that the BDT is not the first-order control on rock permeability, and that potentially exploitable resources may occur in granitic rocks with much lower BDT temperatures (~360 °C) that comprise the bulk of the continental crust. We additionally introduce our published results of hydraulic fracturing experiments on granite from subcritical/brittle to supercritical/ductile conditions, confirming the possibility of well stimulation to create excellent fracture patterns that should allow the effective extraction of thermal energy in the superhot geothermal environments of >~400 °C.

本文言語English
ホスト出版物のタイトル5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, YSRM 2019
出版社International Society for Rock Mechanics and Rock Engineering
ページ19-24
ページ数6
ISBN(電子版)9784907430047
出版ステータスPublished - 2019
イベント5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, YSRM 2019 - Okinawa, Japan
継続期間: 2019 12 12019 12 4

出版物シリーズ

名前5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, YSRM 2019

Conference

Conference5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, YSRM 2019
国/地域Japan
CityOkinawa
Period19/12/119/12/4

ASJC Scopus subject areas

  • 地盤工学および土木地質学
  • 地質学

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