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Part of the bulk rock volume  containing the hydrodynamically connected fluids (also called free fluids) within each pore element:

V_\phi = V_r - V_m

where

solid rock matrix volume


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 :

V_\phi = V_{\rm con} + V_{\rm cls}

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 ]