Part of pore volume V_\phi which is globally hydrodynamically connected and contributes to permeability:
| V_{\rm opn} = \Omega_\phi - \Omega_{\rm cls} |
where
V_{\rm cls} | closed pore volume |
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 ] [Effective porosity (PHIE)] [ Connected porosity ] [ Closed porosity ]