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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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\phi_e(\mathbf{r}, \ p) = \phi_{e0}(\mathbf{r}) \cdot \big[ 1 -+ c_r(p) \, (p-p_i) \big] |
Most Subsurface E&P Disciplines (except Petrophysics) usually omit index "e" and denote Effective porosity as
. LaTeX Math Inline body \phi = \phi_e
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