A pore volume fraction of bulk rock volume
containing the hydrodynamically connected fluids (also called free fluids) within each pore element:
\phi_e = \frac{V_\phi}{V_r} |
It splits into two components: open porosity and closed porosity
:
\phi_e = \phi_{e, {\rm opn}} + \phi_{e, {\rm cls}} |
The log name is PHIE.
Effective porosity is a function of reservoir pressure at a given location
\phi(\mathbf{r}, \ p) = \phi_0(\mathbf{r}) \exp \left[ - \int_{p_i}^p c_r(p) \, dp \right] |
where
| pore compressibility | |
| initial formation pressure |
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics (PP) / Volumetric Rock Model
[ Basic reservoir properties ] [ Pore volume ] [ Open pore volume ] [ Closed pore volume ] [ Porosity ] [ Open porosity ] [ Closed porosity ]