5) a combination-drive reservoir contains 10 mmstb of oil initially in place. the ratio of the original gas-cap volume to the original oil volume, i. e., m, is estimated as 0.25. the initial reservoir pressure is 3000 psia at 150°f. the reservoir produced 1 mmstb of oil, 1 100 mmscf of 0.8 specific gravity gas, and 50,000 stb of water by the time the reservoir pressure dropped to 2800 psi. the following pvt is available: at p -3000 psiat p 2800 psi parameter bo (bbl/stb rs (scf/stb) bg (bbl/scf) bt (bbl/stb bw (bbl/stb) 1.58 1040 0.00080 1.58 1.48 850 0.00092 1.655 the following data is also available: swi = 0.20 cw=1.5x10-6 psi ! cf-10-6 psi ! calculate a. cumulative water influx b. primary driving indexes at 2800 psi