Navigation:  Prospect/Field evaluation > Entering probability distributions > Input Variables > Inerts

See also 'Entering Probability Distributions'.

 

Inert gas (usually nitrogen, carbon dioxide or hydrogen sulphide) can fill the pore space but does not contribute to the hydrocarbon reserve:

 

Gas-in-Place = Net hydrocarbon pore volume x (100-%Inerts) x Gas expansion factor

Recoverable gas = GIP x Gas recovery factor

 

Note: The Gas expansion factor refers to the hydrocarbon gas (though getting this wrong is unlikely to make a significant difference, in a REP context).