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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
can be written as:LaTeX Math Block Reference anchor pher
| LaTeX Math Block | ||||
|---|---|---|---|---|
| ||||
\phi_e(\mathbf{r}, \ p) = \phi_{e0}(\mathbf{r}) \cdot \leftbig[ 1 - c_r(p) \, (p-p_i) \rightbig] |
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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