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Category Text Publication
Reference Category Journals
DOI 10.1007/s00603-021-02416-z
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Title (Primary) Creating cloud‑fracture network by flow‑induced microfracturing in superhot geothermal environments
Author Goto, R.; Watanabe, N.; Sakaguchi, K.; Miura, T.; Chen, Y.; Ishibashi, T.; Pramudyo, E.; Parisio, F.; Yoshioka, K.; Nakamura, K.; Komai, T.; Tsuchiya, N.
Journal Rock Mechanics and Rock Engineering
Year 2021
Department ENVINF
Volume 54
Issue 6
Page From 2959
Page To 2974
Language 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.
Persistent UFZ Identifier
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