@wikipedia
A measure of ability of a porous formation to allow a certain fluid to pass through it:
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| k_f = \mu_f \frac{| {\bf v}|}{ | \nabla p |} |
where
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Permeability depends on fluid type, filling the porous media and the fluid type which is sweeping through it which leads to splitting its value into a product of two components:
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k_f = k_a \cdot k_{rf} |
where
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics
[Absolute permeability] [Relative permeability]
