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Abstract

Applied overburden is supported by both the rock framework and by the fluids in the pore network. The effective stress which the rock framework experiences is related to the lithostatic (overburden) stress and fluid (pore) pressure as follows:

Pe = P1 -Pf

where: Pe is effective stress, P1 is lithostatic pressure, and Pf is fluid pressure.

This relationship assumes that no directed tectonic stress is acting on the system. The following sections will review lithostatic and fluid pressures and their measurement. Major reviews of pressure concepts, terminology, and measurement are available in Fertl (1976), Gretener (1977), Magara (1978), Plumley (1980) Pickering and Delicato (1985), and Hubbard (1988).

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