Analysis of Fault Permeability Using Mapping and Flow Modeling, Hickory Sandstone Aquifer, Central Texas

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.

Thrust fault

Fault gouge

Fault plane

10.1029/91gl00950

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Citations (113)

Contrast of aquifer vulnerability and water quality indices between a unconfined aquifer and a deep aquifer in arid zones

Bulletin of Engineering Geology and the Environment (2020)

Oscar Guadalupe Almanza Tovar José Alfredo Ramos‐Leal José Tuxpan-Vargas Guillermo de Jesús Hernández García Josué De Lara Bashulto

Vulnerability index

Surficial aquifer

Specific storage