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To calculate volume of original gas in place (OGIP) in cubic feet from volume measured in acre-feet, use the following formula :<math>\text{OGIP} = 43,560 \times \text{A} \times \text{h} \times \Phi \times (1 - \text{S}_

...present that cannot be technologically or economically recovered (OOIP and OGIP) as well as other undiscovered potential reserves. | Volumetric || OOIP, OGIP, recoverable reserves. Use early in life of field. || Dependent on quality

...ent (TOC), higher average total porosity and higher original gas in place (OGIP; Fig. 4); however, increasing permits in East Texas, notably the Shelby Tro

;OGIP:original gas in place