The actual pressure history of a reservoir is simulated by the following data, which assume that the pressure at the original oil-water contact is changed instantaneously by a finite amount, Ap. a) Use the van Everdingen and Hurst method to calculate the total cumulative water influx. b) How much of this water influx occurred in the first two years? Table 1. Simulated reservoir -aquifer pressure history Time in years Ap. psi 40 0.5 60 1.0 94 1.5 186 2.0 110 2.5 120 3.0 Other reservoir properties are as follows: Reservoir area=19600 000 ft Aquifer area=686 900 000 k=10.4 md 0=0.25 c=7.01x10psi Hw=1.098 cp h=10 ft