The following PVT data are from a volumetric oil reservoir at an initial pressure of 2000 psia.The connate water saturation is 25%. Assume negligible rock and water compressibilities.

1. Was this reservoir initially saturated or under saturated? Why?

2. When the reservoir pressure fell to 1500 psia, the cumulative production of oil and gas were 7.5 MMstb and 9.5 Bscf respectively. Estimate the initial oil in place.

3. What was the initial reservoir pore volume?