Natural Gas dissolved in Oil, which is then called Live Oil.

The quantitative measure is given by Solution GOR:

$\begin{array}{l}R_s = \frac{V_{Go}^{\circ}}{V_{Oo}^{\circ}} = \frac{m_{Go}}{ m_{Oo}} \cdot \frac{\rho_O^{\circ}}{\rho_G^{\circ}}\end{array}$

where

$\begin{array}{l}V_{Oo}^{\circ}= \frac{m_{Oo}}{\rho_O^{\circ}}\end{array}$	STP volume of dead oil component of mass $\begin{array}{l}m_{Oo}\end{array}$ and STP density $\begin{array}{l}\rho_O^{\circ}\end{array}$
$\begin{array}{l}V_{Go}^{\circ}= \frac{m_{Go}}{\rho_G^{\circ}}\end{array}$	STP volume of natural gas component of mass $\begin{array}{l}m_{Go}\end{array}$ and STP density $\begin{array}{l}\rho_G^{\circ}\end{array}$

$\begin{array}{l}R_s(p, T)\end{array}$ is a cross-phase exchange coefficient and a function of pressure and temperature

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