Dictionary:Local pressure gradient

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The slope (tangent) of a pore fluid pressure versus depth curve. The interstitial pressure within connected pore spaces increases with depth depending on the density of the pore fluid. It is about 0.1–0.2 psi/ft for gas, 0.25–0.4 for oils, 0.433 for pure water, 0.450–0.465 for brines.