Reactivation of critically-stressed basement faults and related induced seismicity in the southeastern Sichuan basin

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Mengke An, Rui Huang, Derek Elsworth, Fengshou Zhang, Zhen-Yu Yin, Liuke Huang, Zhengyu Xu
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引用次数: 0

Abstract

The southeastern Sichuan basin possesses abundant gas shale resources that are currently being recovered. The basement strata are seismically active making it important to understand the effect of fluid injection during geo-energy extraction and storage. We recovered outcropping basement rocks and conducted friction experiments on simulated rock gouge to assess the potential for frictional stability. Meanwhile, we also calculated the poroelastic Coulomb stresses resulting from fluid injection to define the impact of stress perturbations on fault stability. These results are combined with the seismic reflection images to analyze the seismic potential. Results indicate the basement rocks include clay-lean granites and sandstones and clay-rich slates; gouge frictional strength and stability are controlled by the clay contents. The gouge frictional strength monotonically decreases and fault stability is enhanced with increasing clay content. Poroelastic stresses induced by fluid injection can reactivate critically-stressed faults within 2 km of the injection site, but decay rapidly with increasing distance. The experimental-modelling results combined with seismic reflection profiles indicate that basement fault stability is controlled by various factors, including fault aseismic slip in the pressurized zones, poroelastic stress transfer from fluid injection and gouge mineralogy. These results have important implications for understanding instability of basement faults induced by fluid injection during energy extraction and storage and contribute to reducing seismic hazard in the southeastern Sichuan basin.
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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