Mechanical behaviour of the Rotokawa Andesites (New Zealand): Insight into permeability evolution and stress-induced behaviour in an actively utilised geothermal reservoir
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- 作者：P.A. Siratovicha ; paul.siratovich@gmail.com" class="auth_mail" title="E-mail the corresponding author ; M.J. Heapb ; heap@unistra.fr" class="auth_mail" title="E-mail the corresponding author ; M.C. Villeneuvea ; J.W. Colea ; B.M. Kennedya ; J. Davidsona ; T. Reuschlé ; b
- 关键词：Permeability ; Triaxial deformation ; Geothermal ; Rotokawa ; Well stability ; Seismicity
- 刊名：Geothermics
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：64
- 期：Complete
- 页码：163-179
- 全文大小：7695 K
文摘
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We present triaxial experiments on a suite of reservoir rock at a range of different pressure conditions.
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Despite a brittle failure mode, high-porosity and/or highly altered rock can suffer a net porosity decrease after triaxial deformation.
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Brittle deformation may increase or decrease permeability, depending on sample porosity and alteration.
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We provide a Hoek-Brown failure criterion for typical Rotokawa Andesite.
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Finite element modelling shows that brittle failure of intact rock (and therefore off-fault seismicity) is unlikely during production and injection.