Volumetric value of Oil Initial In Place (OIIP) recalculated to NTP conditions:
V_{\rm STOIIP} = \int_{\Omega} \left[ \frac{s_{oi}({\bf r}) }{B_o} + \frac{R_v \, s_{gi}({\bf r})}{B_g} \right] \phi_e({\bf r}) dV |
where
Petroleum reservoir | |
Position vector to some location in a reservoir | |
Volume element of a reservoir | |
Initial formation pressure and temperature at location | |
Effective porosity at location | |
Initial Oil saturation and Gas saturation at location | |
Oil FVF and Gas FVF at Initial formation pressure and temperature | |
Solution GOR and Vaporized Oil Ratio at Initial formation pressure and temperature |
For practical implementation of one needs to build a Geological Model (GM) and perform a numerical integration.
Petroleum Industry / Upstream / Exploration / Booking Reserves / Oil Initial In Place (OIIP) / Stock-Tank Oil Initial In-Place (STOIIP)