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Geological Society, London, Special Publications; 1998; v. 147; p. 147-156;
DOI: 10.1144/GSL.SP.1998.147.01.10
© 1998 Geological Society of London

Faulting Processes and Fault Seal Characterization

The gas permeability of clay-bearing fault gouge at 20°C

D. R. Faulkner & E. H. Rutter

Rock Deformation Laboratory, Department of Earth Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK

Permeability measurements of clay-bearing fault gouges have been made using the pulse-transient and pore pressure oscillation methods with argon as the pore fluid, and at effective pressures up to 160 MPa and at a constant pore pressure of 40 MPa. Samples were collected from the outcrop of a major transpressional fault in southeastern Spain, in three orthogonal directions relative to the planar fabrics developed within the fault zone. Measurements show the gouge to exhibit permeability anisotropies of up to 3 orders of magnitude. In addition, pressure cycling of the gouge reduced the permeability by 2 to 3 orders of magnitude after 5 pressure cycles, when minimum permeabilities slightly less than 10–21 m2 were measured.





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