How pore pressure changes affect stress and strain in fault zones with complex internal structure – Insights from hydromechanical modelling

Treffeisen, Torben; Henk, Andreas

doi:10.1016/j.jsg.2023.104847

Cited by 6 publications

(2 citation statements)

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“…For this information, we relied on observed variations in the caprock, fault, and reservoir characteristics within the Qiabuqia Geothermal Field in Qinghai Province's Gonghe Basin, China. The unmeasurable parameters were largely estimated using established selection guidelines, and data from additional scholarly sources were referred to [42,[61][62][63]. It is the fluid changes in a reservoir that directly induce fault activation during subsurface fluid engineering.…”

Section: Model Setupmentioning

confidence: 99%

“…In this model, the fault zone consists of high-permeability fault core and a low-permeability damage zone [39][40][41]. There is also model that further subdivides fault zones based on this symmetrical dual structure [42 Another frequently employed model in numerical simulations simplifies the fault as zone of homogeneous rock layers [43][44][45]. In summary, the representation of faults in nu merical simulations is predominantly characterized by symmetrical structures.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Structural Symmetry of Fault Zones on Fluid-Induced Fault Slips and Earthquakes

Niu,

Bai

2024

Water

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Subsurface fluid injection and extraction can reactivate faults and induce earthquakes. In current research, faults are typically described as symmetrical structures and the presence of asymmetric structures is often overlooked. The reality is that numerous asymmetric faults exist within the Earth’s crust. The architectural and permeability characteristics of fault zones differ significantly between symmetrical and asymmetrical faults. These differences may have a great influence on fault stability during fluid injection or extraction. In this study, the impact of fault zone structures on fluid-induced slips and seismic activity were investigated through numerical analysis. The findings indicated that symmetrical faults were more likely to induce larger slips and earthquakes during various subsurface fluid operations. For asymmetric faults, larger induced slips occurred when fluid was operated in a hanging wall reservoir than in a footwall reservoir. In symmetrical faults, the opposite was true. When evaluating the stability of a fault in subsurface fluid engineering, the fault structure and fluid pattern and their combined effects must be considered comprehensively.

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Section: Model Setupmentioning

confidence: 99%