Gas initially in place

Gas initially in place (GIIP) or original gas in place (OGIP) denote the total estimated quantity (volume) of natural gas contained in a "subsurface" asset prior to extraction (production).[1]

Gas Initially In Place = Gross Rock Volume * Net/Gross * Porosity * average initial Gas Saturation / Formation Volume Factor [2]

References

SPE (2011). Guidelines for Application of the Petroleum Resources Management System. Society of Petroleum Engineers. p. 222.
Dutton, John A. "5.2: Estimation of Original Gas In-Place, OGIP, Using the Volumetric Method". e-Education Institute. PennState College of Earth and Mineral Sciences. Retrieved 26 July 2022.

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[PRMS2011-1] SPE (2011). Guidelines for Application of the Petroleum Resources Management System. Society of Petroleum Engineers. p. 222.

[2] Dutton, John A. "5.2: Estimation of Original Gas In-Place, OGIP, Using the Volumetric Method". e-Education Institute. PennState College of Earth and Mineral Sciences. Retrieved 26 July 2022.