@wikipedia
Part of the bulk rock volume
Pore volume
fraction of bulk rock volume V containing the the hydrodynamically connected fluids (also called called free fluids) within each pore element with total volume :| LaTeX Math Block |
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\phi_e = V_\phi = \frac{V\Omega_f\phi}{V\Omega_r} |
Although the fluid inside the pore is movable but some pores maybe isolated from each other and do not contribute to rock permeability.
This splits the effective pore volume It splits into two components: open pore volume and closed pore volumeporosity and closed porosity:
| LaTeX Math Block |
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V_\phi_e = V_{\rm open} + V_{\rm closed} |
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