Calculate the original oil in place (OOIP) of an oil reservoir if the drainage area = 1600 acres, thickness=30 ft, porosity=0.3 and Sw=0.2 at the initial reservoir pressure = 4000 psi. Note that the reservoir bubble point pressure is 3000 psi. Your answer should be in [reservoir barrels] or [rb].
The oil formation volume factor at 4000 psi is 1.5 rb/stb. Calculate the amount of oil produced at the stock tank condition, if 15% of the reservoir oil is produced and there is no significant change in reservoir pressure. Your answer should be in [stock tank barrels] or [stb].