reservior engineering a and b

A gas cap reservoir is estimated to have an initial gas cap volume half of the size of its oil zone. After 10 years of production, the ratio of the gas cap to the oil zone volume increases to 2/3. The cumulative oil and gas production as a function of average reservoir pressure are listed in Table 1. Also listed are the relevant PVT data. The initial reservoir pressure was 3400psia(PiPb) Table 1: PVT and production data (a) Determine the initial oil in place in STB (b) Determine the initial gas in place (both free gas and solution gas) in SCF