Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1007/s00603-021-02416-z
Volltext Shareable Link
Titel (primär) Creating cloud‑fracture network by flow‑induced microfracturing in superhot geothermal environments
Autor Goto, R.; Watanabe, N.; Sakaguchi, K.; Miura, T.; Chen, Y.; Ishibashi, T.; Pramudyo, E.; Parisio, F.; Yoshioka, K.; Nakamura, K.; Komai, T.; Tsuchiya, N.
Quelle Rock Mechanics and Rock Engineering
Erscheinungsjahr 2021
Department ENVINF
Band/Volume 54
Heft 6
Seite von 2959
Seite bis 2974
Sprache englisch
Topic T8 Georesources
Keywords Hydraulic fracturing; Supercritical geothermal energy; Superhot geothermal energy; Enhanced geothermal system; Granite
Abstract Superhot geothermal environments with temperatures of approximately 400–500 °C at depths of approximately 2–4 km are attracting attention as new kind of geothermal resource. In order to effectively exploit the superhot geothermal resource through the creation of enhanced geothermal systems (superhot EGSs), hydraulic fracturing is a promising technique. Laboratory-scale hydraulic fracturing experiments of granite have recently demonstrated the formation of a dense network of permeable fractures throughout the entire rock body, referred to as a cloud-fracture network, at or near the supercritical temperature for water. Although the process has been presumed to involve continuous infiltration of low-viscosity water into preexisting microfractures followed by creation and merger of the subsequent fractures, a plausible criterion for cloud-fracture network formation is yet to be clarified. The applicability of the Griffith failure criterion is supported by hydraulic fracturing experiments with acoustic emission measurements of granite at 400 °C under true triaxial stress and at 450 °C under conventional triaxial stress. The present study provides, for the first time, a theoretical basis required to establish the procedure for hydraulic fracturing in the superhot EGS.
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Goto, R., Watanabe, N., Sakaguchi, K., Miura, T., Chen, Y., Ishibashi, T., Pramudyo, E., Parisio, F., Yoshioka, K., Nakamura, K., Komai, T., Tsuchiya, N. (2021):
Creating cloud‑fracture network by flow‑induced microfracturing in superhot geothermal environments
Rock Mech. Rock Eng. 54 (6), 2959 - 2974 10.1007/s00603-021-02416-z