Part of the connected pore  which are connected  :

\phi_{e, {\rm opn}} = \frac{V_{\rm opn}}{V_r}


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 ]