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The quantitative measure of volatile oil in gas phase.measure  of Saturation gas:

Excerpt

LaTeX Math Inline
bodyR_v s = \frac{V_{OgGo}^{\LARGE \circ}}{V_{GgOo}^{\LARGE \circ}} = \frac{m_{OgGo}}{ m_{GgOo}} \cdot \frac{\rho_G^O^{\LARGE \circ}}{\rho_O^G^{\LARGE \circ}}

where 


LaTeX Math Inline
bodyV_{
Og
Oo}^{\LARGE \circ}= \frac{m_{
Og
Oo}}{\rho_O^{\LARGE \circ}}
 – STP volume of dead oil component of mass 
LaTeX Math Inline
bodym_{OgOo}
and STP density
LaTeX Math Inline
body\rho_O^{\LARGE \circ}

LaTeX Math Inline
bodyV_{
Gg
Go}^{\LARGE \circ}= \frac{m_{
Gg
Go}}{\rho_G^{\LARGE \circ}}
 – STP volume of natural gas component of mass
LaTeX Math Inline
bodym_{GgGo}
and STP density
LaTeX Math Inline
body\rho_G^{\LARGE \circ}



LaTeX Math Inline
bodyR_vs(p, T)
is a function of pressure and temperature due to oil-gas exchange

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