Volumetric value of Gas Initial In Place (GIIP) recalculated to NTP conditions:
| (1) | V_{\rm STGIIP} = \int_{\Omega} \left[ \frac{s_{gi}({\bf r}) }{B_g} + \frac{R_s \, s_{oi}({\bf r})}{B_o} \right] \phi_e({\bf r}) dV |
where
\Omega | Petroleum reservoir |
{\bf r} = (x,y,z) | Position vector to some location in a reservoir |
dV = dx \, dy \, dz | Volume element of a reservoir |
p_i({\bf r}), \, T_i({\bf r}) | Initial formation pressure and temperature at location {\bf r} |
\phi_e({\bf r}) | Effective porosity at location {\bf r} |
s_{oi}({\bf r}), \, s_{gi}({\bf r}) | Initital Oil saturation and Gas saturation at location {\bf r} |
B_o(p_i, T_i), \, B_g(p_i, T_i) | Oil FVF and Gas FVF at Initial formation pressure and temperature |
R_s(p_i, T_i), \, R_v(p_i, T_i) | Solution GOR and Vaporized Oil Ratio at Initial formation pressure and temperature |
For practical implementation of
(1) one needs to build a Geological Model (GM) and perform a numerical integration.
See Also
Petroleum Industry / Upstream / Exploration / Booking Reserves / Gas Initial In Place (GIIP) / Stock-Tank Gas Initial In-Place (STGIIP)