Combination of electrical and permeability measurements provides a great deal of information about changes in pore and crack networks as saturated rocks are deformed. Complex electrical parameters measured as a function of frequency provide information on the internal surface topology of the rock, information that is of prime importance to explanation of the way fluid permeability of rocks varies with confining pressure and deformation. Tests made at raised hydrostatic confining pressure and during uniaxial deformation until failure, show how processes of pore/crack compaction, dilation and inter-linking control both the electrical conductivity and the fluid permeability of the rock.

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