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There is a statistical correlation between absolute permeability 

LaTeX Math Inline
bodyk_a
 and formation porosity 
LaTeX Math Inline
body\phi
 which can be approximated by various permeability-porosity models.

Absolute permeability stays constant for small pressure variations but in a wide range of pressure variations the dependence on ambient pressure 

LaTeX Math Inline
bodyc_r(p)
 can not be neglected and should be tabulated from laboratory core tests or estimated from permeability-pressure correlations. 

See also

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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics

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