3) an oil reservoir exists at its bubble-point pressure of 3000 psia and temperature of 160°f the oil has an api gravity of 420 and gas-oil ratio of 600 scf/stb. the specific gravity of the solution gas is 0.65. the following additional data are also available: reservoir area 640 acres average thickness 10 ft connate water saturation-0.25 · effective porosity-15% calculate the initial oil in place in stb