Hydrocarbon pore volume occupied by gas cap
Input(s)
m: Ratio of Initial Gas Cap Gas Reservoir Volume to Initial Reservoir Volume (bbl/bbl)
\(\mathrm{N}\): Initial Oil in Place (STB)
\(\mathrm{B}_{\mathrm{oi}}\): Initial Oil Formation Volume Factor (bbl/STB)
\(\mathrm{B}_{\mathrm{gi}}\): Initial Gas Formation Volume Factor \((\mathrm{bbl} / \mathrm{SCF})\)
\(\mathrm{B}_{\mathrm{g}}\): Current Gas Formation Volume Factor \((\mathrm{bbl} / \mathrm{SCF})\)
Output(s)
V: Volume of the Gas Cap at Current Pressure (bbl)
Formula(s)
\[
\mathrm{V}=\frac{\mathrm{m} * \mathrm{~N} * \mathrm{~B}_{\mathrm{oi}} * \mathrm{~B}_{\mathrm{g}}}{\mathrm{B}_{\mathrm{gi}}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4, Page: 301 .