$\begin{array}{l}\displaystyle B_o(p, T) = 0.497069 + 0.862963 \cdot 10^{-3} \, T + 0.182594 \cdot 10^{-2} \, F + 0.318099 \cdot 10^{-5} \, F^2, \quad F =R_s^a \, \gamma_g^b \, \gamma_o^c\end{array}$

$\begin{array}{l}a = 0.742390, \, b = 0.323294, \, c = -1.202040\end{array}$

where

$\begin{array}{l}p\end{array}$	psia	Fluid pressure
$\begin{array}{l}T\end{array}$	°F	Initial formation temperature
$\begin{array}{l}\gamma_{API}\end{array}$	°API	Oil API gravity
$\begin{array}{l}\gamma_o\end{array}$	frac	Oil specific gravity
$\begin{array}{l}\gamma_g\end{array}$	frac	Gas specific gravity

References

Petrosky, G.E., and F.F. Farshad. "Pressure-Volume-Temperature Correlations for Gulf of Mexico Crude Oils." Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, October 1993. doi: https://doi.org/10.2118/26644-MS

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Petrosky–Farshad (1993) saturated oil formation volume factor Bo @model

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References