A model for the variation in permeability of clay-bearing fault gouge with depth in the brittle crust

Details A model for the variation in permeability of clay-bearing fault gouge with depth in the brittle crust A model for the variation in permeability of clay-bearing fault gouge with depth in the brittle crust

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3119611f&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 19, CiteID L19611

Physics

9

Physical Properties Of Rocks: Microstructure, Physical Properties Of Rocks: Permeability And Porosity, Structural Geology: Fractures And Faults, Structural Geology: Role Of Fluids

Scientific paper

A model of the variation in permeability of clay-bearing fault gouge in the brittle crust is presented. Factors affecting the permeability from laboratory experiments are considered and quantified. These are pressure, temperature and permeating fluid. Effective pressure ($\overline{\sigma) and temperature (T) effects on permeability (k) are described by k = k0exp(-0.01Δ$\overline{\sigma)exp(-0.01ΔT) where k0 is a reference permeability at a particular temperature and pressure. At low temperatures (<80°C), with aqueous pore fluids, the above relation is modified to k = k0exp(-0.01Δ$\overline{\sigma)$\left(\frac{T}{Tc}\right)^{1.2exp(-0.01ΔT) in order to describe low temperature (less than a critical temperature, Tc, of 80°C) inferred physicochemical interactions between pore fluids and the fault gouge. The model is used to predict the variation in permeability as a function of depth for different ratios (λ) of pore fluid pressure to confining pressure.

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