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It stays constant for small pressure variations (

LaTeX Math Inline
bodyc_r(p) = \rm const
) but for a wide range pressure variations the dependence on ambient pressure 
LaTeX Math Inline
bodyc_r(p)
can not be neglected and can be estimated experimentally or via popular compressibility-porosity correlations on
LaTeX Math Inline
bodyc_r(\phi)
. 


The typical values are in 

LaTeX Math Inline
body0.5 \div 1.5 \cdot 10^{-6} \, {\rm kPa}^{-1}
 but may go higher for poorly consolidated rocks.

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