1.2 The following data are read from a contour map of a gas reservoir with a gas specific gravity of 0.667. It shows area as a function of the depth of a production zone. Calculate the reservoir volume using the trapezoidal rule. Depth, Feet 2,900 2,925 2,950 2,975 3,000 3,025 3,050 Area, Acres 20 35 50 70 95 110 130 Average thickness above 2900 ft = 0 This gas reservoir is estimated to have the following properties: $=0.3 Swt = 0.25 P = 3,000 psia T = 200 F Based on the data above and in question 1 you are asked to a. Calculate the initial gas-in-place. b. Calculate the gas reserves, If the reservoir is abandoned at a pressure of 400 psia c. Calculate how much are the remaining reserves and how much gas has already been produced, If after four years of production, reservoir pressure has depleted to 2,500 psia. d. Assuming there is a partial water drive and sweep efficiency of the water influx is 0.65 and residual gas saturation the the invaded zone is 0.45 calculate the gas recovery factor. (Attention this part is bonus work on it if you have time) (Hint the Sutton correlations to calculate the gas pseudo crtitcal properties are given as follows: Ppc=671.1+14.0*Y-34.3*, and Tpc=120.1+429Y-62.9*Y.)