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A measure of ability of a porous formation to allow a certain fluid to pass through it:

Excerpt


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k_f = \mu_f \frac{| {\bf v}|}{ | \nabla p |}

where

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body\mu_f

fluid viscosity

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body| {\bf v}|

fluid velocity

LaTeX Math Inline
body\nabla p

pressure gradient


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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_{r\alpha}

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