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In BO and MBO PVT models when oil and gas phases reach chemical equilibrium the total mass of oil and gas components spread between oil and gas phases according to ambient pressure 

LaTeX Math Inline
bodyp
 and temperature 
LaTeX Math Inline
bodyT
.


Given a mixture of oil and gas sharing the same volume under pressure 

LaTeX Math Inline
bodyp
 and temperature 
LaTeX Math Inline
bodyT
with

the total mass of oil component

LaTeX Math Inline
bodym_O = m_{Oo}(p,T) + m_{Og}(p,T)


the total mass of gas component

LaTeX Math Inline
bodym_G = m_{Gg}(p,T) + m_{Go}(p,T)


where

the mass share of oil component in oil phase 

LaTeX Math Inline
bodym_{Oo}(p,T)
 

the mass share of oil component in gas phase 

LaTeX Math Inline
bodym_{Og}(p,T)


the mass share of gas component in oil phase 

LaTeX Math Inline
bodym_{Go}(p,T)
 

mass share of gas component in gas phase 

LaTeX Math Inline
bodym_{Gg}(p,T)


are all functions of pressure 

LaTeX Math Inline
bodyp
 and temperature 
LaTeX Math Inline
bodyT
.


The quantitative measure of cross-phase exchange is given by Soliton GOR (

LaTeX Math Inline
bodyR_s
) and Vaporized Oil Ration (
LaTeX Math Inline
bodyR_v
)
: