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Hydrogeology of Thrust Faults and Crystalline Thrust Sheets: Results of Combined Field and Modeling Studies

机译:逆冲断层和结晶逆冲片的水文地质:结合场和模拟研究的结果

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摘要

Field, laboratory, and modeling studies of faulted rock yield insight into the hydraulic character of thrust faults. Late‐stage faults comprise foliated and subparallel faults, with clay‐rich gouge and fracture zones, that yield interpenetrating layers of low‐permeability gouge and higher‐permeability damage zones. Laboratory testing suggests a permeability contrast of two orders of magnitude between gouge and damage zones. Layers of differing permeability lead to overall permeability anisotropy with maximum permeability within the plane of the fault and minimum permeability perpendicular to the fault plane. Numerical modeling of regional‐scale fluid flow and heat transport illustrates the impact of fault zone hydrogeology on fluid flux, fluid pore pressure, and temperature in the vicinity of a crystalline thrust sheet.
机译:对断层岩石的现场,实验室和建模研究可以深入了解逆冲断层的水力特征。晚期断层包括叶状断层和次平行断层,以及富含粘土的气孔和断裂带,形成了低渗透性气孔和高渗透性破坏区的互穿层。实验室测试表明,在断层和破坏区之间的渗透率差异为两个数量级。渗透率不同的层导致整体渗透率各向异性,其中断层平面内的渗透率最大,垂直于断层平面的渗透率最小。区域尺度的流体流动和传热的数值模型说明了断层带水文地质学对结晶冲断层附近流体通量,流体孔隙压力和温度的影响。

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