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There is a statistical correlation between initial formation compressibility

LaTeX Math Inline

body	c_r(\phi)

and formation porosity which can be picked by various compressibility-porosity models.

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

LaTeX Math Inline

body	c_r(p)

can not be neglected and should be tabulated from laboratory core tests or estimated from compressibility-pressure correlations.

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