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→Confining pressure
===Confining pressure===
===Confining pressure===
[[file:permeability_fig3.png|300px|thumb|{{figure number|3}}Effect of net confining stress on permeability. (After <ref name=pt05r8 />.)]]
[[file:permeability_fig3.png|300px|thumb|{{figure number|3}}Effect of net confining stress on permeability. (After Amaefule et al.<ref name=pt05r8 />)]]
Permeability decreases with increasing confining pressure. Unconsolidated or poorly lithified rock undergoes much greater permeability reduction under confining pressure than well-consolidated rock. As shown in [[:file:permeability_fig3.png|Figure 3]], a greater percentage of permeability reduction is typically observed in lower permeability rock than in higher permeability rock. To determine permeability-stress relationships, which are representative of ''in situ'' reservoir conditions, permeability measurements should be made on selected samples at a series of confining pressures. Jones<ref name=pt05r86>Jones, S. C., 1988, Two-point determinations of permeability and PV versus net confining stress: Society of Petroleum Engineer Formation Evaluation, v. 3, p. 235–241.</ref> has recently presented a method that allows a two-point determination of a permeability-stress model that reduces the required number of permeability measurements under confining stress for permeability-stress prediction.
Permeability decreases with increasing confining pressure. Unconsolidated or poorly lithified rock undergoes much greater permeability reduction under confining pressure than well-consolidated rock. As shown in [[:file:permeability_fig3.png|Figure 3]], a greater percentage of permeability reduction is typically observed in lower permeability rock than in higher permeability rock. To determine permeability-stress relationships, which are representative of ''in situ'' reservoir conditions, permeability measurements should be made on selected samples at a series of confining pressures. Jones<ref name=pt05r86>Jones, S. C., 1988, Two-point determinations of permeability and PV versus net confining stress: Society of Petroleum Engineer Formation Evaluation, v. 3, p. 235–241.</ref> has recently presented a method that allows a two-point determination of a permeability-stress model that reduces the required number of permeability measurements under confining stress for permeability-stress prediction.