Oil in place in saturated oil reservoirs
Input(s)
\(\mathrm{N}_{\mathrm{p}}\): Cumulative Oil Production (STB)
\(\mathrm{B}_{\mathrm{o}}\): Oil Formation Volume Factor \((\mathrm{bbl} / \mathrm{STB})\)
\(\mathrm{G}_{\mathrm{p}}\): Cumulative Gas Production (MSCF)
\(\mathrm{R}_{\mathrm{s}}\): Gas Solubility \((\mathrm{SCF} / \mathrm{STB})\)
\(\mathrm{B}_{\mathrm{g}}\): Gas Formation Volume Factor (bbl/SCF)
\(\mathrm{B}_{\mathrm{oi}}\): Initial Oil Formation Volume Factor (bbl/STB)
\(\mathrm{R}_{\mathrm{si}}\): Initial Gas Solubility \((\mathrm{SCF} / \mathrm{STB})\)
Output(s)
\(\mathrm{N}\): Oil in Place (bbl)
Formula(s)
\[
\mathrm{N}=\frac{\mathrm{N}_{\mathrm{p}} * \mathrm{~B}_{\mathrm{o}}+\left(\mathrm{G}_{\mathrm{p}}-\mathrm{N}_{\mathrm{p}} * \mathrm{R}_{\mathrm{s}}\right) * \mathrm{~B}_{\mathrm{g}}}{\mathrm{B}_{\mathrm{o}}-\mathrm{B}_{\mathrm{oi}}+\left(\mathrm{R}_{\mathrm{si}}-\mathrm{R}_{\mathrm{s}}\right) * \mathrm{~B}_{\mathrm{g}}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 5, Page: 334 .