A value of oil saturation $\begin{array}{l}k_{rog} (s_o < s_{rog}\end{array}$ below which oil is not getting swept by gas:

(1)	$\begin{array}{l}\displaystyle k_{rog} (s_o < s_{rog}) =0\end{array}$

It usually depends on absolute permeability $\begin{array}{l}k_a\end{array}$ as:

(2)	$\begin{array}{l}\displaystyle s_{org} = s_{org,0} \cdot \left( 1 + k_a/k_{a,sorg} \right)^{-n_{sorg}}\end{array}$

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