Reservoir pressure of the gas phase $\begin{array}{l}p_g\end{array}$ :

(1)	$\begin{array}{l}\displaystyle p_g= p + \frac{1}{3}(P_{cow}- 2 \, P_{cog})\end{array}$

(2)	$\begin{array}{l}\displaystyle p_g= p - \frac{1}{2} \, P_{cgw}\end{array}$

(3)	$\begin{array}{l}\displaystyle p_g= p + \frac{1}{2} \, P_{cgw}\end{array}$

where

$\begin{array}{l}p\end{array}$	Average phase pressure
$\begin{array}{l}P_{cow}\end{array}$	Oil-Water capillary pressure
$\begin{array}{l}P_{cog}\end{array}$	Oil-Gas capillary pressure

(4)	$\begin{array}{l}\displaystyle p_g= p + \frac{1}{3}(P_{cow}-2P_{cog})\end{array}$

where

$\begin{array}{l}p\end{array}$	Average phase pressure
$\begin{array}{l}P_{cow}\end{array}$	Oil-Water capillary pressure
$\begin{array}{l}P_{cog}\end{array}$	Oil-Gas capillary pressure

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See also