For studying rock porosity change affecting by the pressure, use Newman correlation to calculate the pore volume (isothermal) compressibility, cf, for sandstones as below (Eqn. 2.2-which is attached). I have also attached my results for part a.I need help with part B. It is using the formula: c=1/vdV/dp where v= volume, c= compressibility values calculated in part a, and p is pressure. I am mostly confused on how to compute the change in volume. (a) Calculate cf for 5 different phi (porosity) =0.02,0.05,0.1,0.15,0.2 I have already completed this portion and it is attached with the answers needed for part b highlighted in yellow in the uploaded figure. (b) Estimate dVN for these five cases of phi (porosity), if initial reservoir is 3250 psia and the current reservoir pressure is 1500 psia. Cf=(1+55.872)1.4285997.32(10)6 Transcribed Image Text: cf 97.32(10)6(1+55.8724)142859