气候变化领域集成服务门户(CCPortal): Temperature and Fluid Pressurization Effects on Frictional Stability of Shale Faults Reactivated by Hydraulic Fracturing in the Changning Block, Southwest China

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DOI	10.1029/2020JB019584
	Temperature and Fluid Pressurization Effects on Frictional Stability of Shale Faults Reactivated by Hydraulic Fracturing in the Changning Block, Southwest China
	An M.; Zhang F.; Chen Z.; Elsworth D.; Zhang L.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	A shale fault reactivated during multistage hydraulic fracturing in the Changning block in the Sichuan Basin, southwest China, accompanied a cluster of small earthquakes with the largest reaching ML ~ 0.8. We illuminate the underlying mechanisms of fault reactivation through measurements of frictional properties on simulated fault gouge under hydrothermal conditions. Velocity-stepping experiments were performed at a confining pressure of 60 MPa, temperatures from 30 to 300°C, pore fluid pressures from 10 to 55 MPa, and shear velocities between 0.122 and 1.22 μm/s. Results show that the gouge is frictionally strong with coefficient of friction of 0.6–0.7 across all experimental conditions. At observed in situ pore fluid pressure (30 MPa), the slip stability response is characterized by velocity strengthening at temperatures of 30–200°C and velocity weakening at temperatures of 250–300°C. Increasing the pore fluid pressure can increase values of (a − b) at temperatures ≥200°C, narrowing the temperature range where velocity weakening occurs. At the in situ temperature (90°C), the simulated gouge shows only velocity strengthening behavior and aseismic slip at elevated pore fluid pressures, contrary to the observed seismicity. We postulate that the aseismic slip at elevated pore fluid pressures may trigger seismicity by activating adjacent earthquake-prone faults. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	fluid pressurization; frictional stability; high temperature; hydraulic fracturing; reactivated shale fault
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187676
作者单位	Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China; Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai, China; CNPC Engineering Technology R&D Company Limited, Beijing, China; Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, The Pennsylvania State University, University Park, PA, United States; Department of Geosciences, The Pennsylvania State University, University Park, PA, United States; Department of Civil and Architectural Engineering and Mechanics, University of Arizona, Tucson, AZ, United States
推荐引用方式 GB/T 7714	An M.,Zhang F.,Chen Z.,et al. Temperature and Fluid Pressurization Effects on Frictional Stability of Shale Faults Reactivated by Hydraulic Fracturing in the Changning Block, Southwest China[J],2020,125(8).
APA	An M.,Zhang F.,Chen Z.,Elsworth D.,&Zhang L..(2020).Temperature and Fluid Pressurization Effects on Frictional Stability of Shale Faults Reactivated by Hydraulic Fracturing in the Changning Block, Southwest China.Journal of Geophysical Research: Solid Earth,125(8).
MLA	An M.,et al."Temperature and Fluid Pressurization Effects on Frictional Stability of Shale Faults Reactivated by Hydraulic Fracturing in the Changning Block, Southwest China".Journal of Geophysical Research: Solid Earth 125.8(2020).