1. From well log data you have found a potential limestone reservoir of 23 m of gross thickness. The average of RHOB density in the zone is 2300 Kg/m3, the

true resistivity from DLL after environmental corrections is 1.5 ohm-m, water formation resistivity was found from SP measurements to be 0.025 ohm-m. The lecture of the sonic log is almost a constant value of 60 us/ft for the compressional wave, and 90 us/ft for the shear wave. From SCAL in core plugs, it was found that a=1.1, m=1.9, n=2.1. Calculate the following: (20 points) (a) Average (total) porosity in this reservoir (in fraction, two decimals) = (b) Average micro-porosity in this reservoir (in fraction, two decimals) (c) Average Sw (in fraction, two decimals) = (d) Average So (in fraction, two decimals) = (e) Average Bulk Modulus (in GPa, one decimal) = (f) Average Shear Modulus (in GPa, one decimal)= (g) Average Poisson ratio (one decimal)= (h) Is this a hard or soft rock? Why? Compare with what? (i) Average Hydrocarbon Pore Thickness (in m) G) Is this a pay zone if the cutoff of porosity and water saturation are 0.2 and 0.4 respectively?(yes or no)