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c_r = \frac{1}{\phi} \frac{\partial \phi}{\partial p} |
The above correlation assumes constant which holds true in many practical applications.
It stays constant for small pressure variations:
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c_r(p) = \rm const |
For wide range pressure variations formation compressibility the dependence of ambient pressure can not be neglected:
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c_r = c_r(p) |
The pressure dependence can be estimated experimentally or via popular compressibility-porosity correlations on
.
