Problem 2: A volumetric gas field has an initial pressure of 4200 psia, a porosity of 17.2 per cent, and connate water of 23 per cent. The gas volume factor at 4200 psia is 292 SCF/ft³ and at 750 psia is 54 SCF/ft³. a) Calculate the initial gas in place in standard cubic feet per acre-ft. b) Calculate the initial gas reserve in standard cubic feet per acre-ft assuming an abandonment pressure of 750 psia. c) Calculate the initial reserve of a 640-acre unit whose average net productive formation thickness is 34 ft, assuming an abandonment pressure of 750 psia. d) Calculate the recovery factor based on an abandonment pressure of 750 psia.