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Effective porosity is a function of reservoir pressure at a given location
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\phi_e(\mathbf{r}, \ p) = \phi_{e0}(\mathbf{r}) \exp \left[ \int_{p_i}^p c_r(p) \, dp \right] |
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| pore compressibility (see also Pore compressibility @model ) | ||||
| initial formation pressure |
This leads to the effect of Porosity Shrinkage.
Since the pore compressibility is very low (~ cr = 0.5 ÷ 1.5 GPa-1) for all subsurface rocks in petroleum reservoirs the
can be written as:LaTeX Math Block Reference anchor pher
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