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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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Since the pore compressibility is very low (~ cr = 0.5 ÷ 1.5 GPa-1) for all subsurface rocks in petroleum reservoirs the LaTeX Math Block Reference |
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can be written as:
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\phi_e(\mathbf{r}, \ p) = \phi_{e0}(\mathbf{r}) \cdot \left[ 1 - c_r(p) \, (p-p_i) \right] |
Most Subsurface E&P Disciplines (except Petrophysics) usually omit index "e" and denote Effective porosity as .
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