Calculating the initial gas reserve of a 180-acre unit of the Bell Gas Field by volumetric depletion and under partial and complete water drive.

Given:

Average Porosity = 24%

Connate Water Saturation = 27%

Residual gas saturation after water displacement = 36%

Be = 0.00633 cu A/SCF at p. = 3450 psia.

Bg - 0.00677 cu ft/SCH at 2800 psia = 0.03823 cu f/SCF at 580 psia

Net productive thickness = 60 ft.