Total volume of subsurface oil reserves in NTP conditions.
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V_{\rm STOIIP} = \int_{\Omega} B^{-1}_o(p_i({\bf r}), T_i({\bf r})) s_o({\bf r}) \phi_e({\bf r}) dV |
where
| Petroleum reservoir | ||||||||
| Position vector to some location in reservoir | ||||||||
| Volume element | ||||||||
| Initial formation pressure and temperature at location
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| Effective porosity at location
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| Oil saturation at location
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| Oil formation volume factor |