报告详情
Reactivation of hydrothermal granitic faults: Implications for injection-induced seismicity in EGS
编号：47
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更新：2025-07-22 15:29:06 浏览：45次
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摘要
We investigate how temperature, and mineral composition jointly control frictional behavior and induced seismicity in granite fault gouges under simulated geothermal reservoir conditions. Laboratory shear experiments on seven Gonghe granitic gouges (2.45–3.6 km depth) in hydrothermal conditions reveal two temperature-dependent slip regimes: velocity-weakening between ≈ 100–250°C, and velocity-strengthening above ≈ 250°C. Gouges richer in tectosilicates show enhanced frictional strength and unstable slip tendencies, while phyllosilicate-rich samples favor stable aseismic slip. Simulations quantify Coulomb failure stress change (ΔCFS) perturbations up to ~0.013 MPa at distances of 1000 m, demonstrating the potential for fault reactivation across the reservoir. These findings clarify the conditions under which granitic pre‑existing faults transition to unstable slip during geothermal operations, offering critical insights into induced seismicity risk.
关键词
Gonghe EGS,Granitic fault,Hydrothermal conditions,Mineralogy,Induced seismicity
报告人
Shutian Cao
PHD student Tongji University稿件作者
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重要日期
-
会议日期
08月23日
2025
至08月26日
2025
-
07月31日 2025
初稿截稿日期
-
08月20日 2025
报告提交截止日期
-
08月26日 2025
注册截止日期
主办单位
Southwest Jiaotong University, China (SWJTU)
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
承办单位
Southwest Jiaotong University, China (SWJTU)
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
International Consortium on Geo-disaster Reduction (ICGdR)
UNESCO Chair on Geoenvironmental Disaster Reduction
联系方式
- Yufeng Wang
- wa******@swjtu.edu.cn
- +86********
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