Saturated oil formation volume factor	B_o	psia	p ≤ p_b	$\begin{array}{l}\displaystyle B_o(p, T) = 1.0 + 10^A, \quad A = c_1 + c_2 \, \log_{10} B^_{ob} + c_3 \, \left( \log_{10} B^_{ob} \right)^2\end{array}$ $\begin{array}{l}B^*_{ob} = R_s(p, T) \, \left( \frac{\gamma_g}{\gamma_o} \right)^{c_4} + c_5 \, T\end{array}$ $\begin{array}{l}c_1 = -6.58511, \ c_2 = 2.91329, \ c_3 = -0.27683, \ c_4 =0.526, \ c_5 = 0.968\end{array}$

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
$\begin{array}{l}R_s\end{array}$	scf/stb	Solution Gas Oil Ratio

References

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