@wikipedia
Part of the bulk rock volume containing the hydrodynamically connected fluids (also called free fluids) within each pore element:
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V_\phi = V_r - V_m |
where
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 pore volume into two components: connected pore volume and closed pore volume:
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V_\phi = V_{\rm connected} + V_{\rm closed} |
See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics (PP) / Volumetric Rock Model
[ Basic reservoir properties ] [ Pore volume ] [ Connected pore volume ] [ Closed pore volume ] [ Porosity ] [ Connected porosity ] [ Closed porosity ]
