Abstract
Excess fluid pressure in compacting shales is analysed with the help of an approximate solution of the fluid flow equation. Excess head depends on hydraulic diffusivity, thickness of the shale, bulk rock density, and rate of sedimentation. Both storage coefficient and hydraulic conductivity of shales decrease with compaction. Hydraulic diffusivity of shales increases up to a maximum and then decreases with decreasing porosity. In case the rate of permeability decline with compaction is high, then significant excess heads may develop in shales during burial. Shales which include sand lenses acquire higher excess fluid pressures than pure shales because the storage coefficient of sands decreases at a far lower rate than that of shales during burial.
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