An undersaturated oil reservoir $($no gas cap and no water aquifer$)$ has aconnate water saturation of $0\mathrm{.}24.$ The initial oil$-$in$-$place is estimated at $200$MMSTB$.$ The compressibility of oil is $10$x$10-6$ psi$-1$ and that of water is$3$x$10-6$ psi$-1.$ The reservoir porosity is $0\mathrm{.}25.$ Estimate:$1.$ The pore compressibility$\mathrm{.}2.$ The total compressibility in the oil reservoir$\mathrm{.}3.$ The effective oil compressibility in the reservoir$\mathrm{.}24.$ The cumulative oil produced if reservoir pressure drops frominitial pressure of $3000$ psia $($where OFVF $=1\mathrm{.}5$ RB$/$STB$)$ to $2500$psia $($where OFVF $=1\mathrm{.}75$ RB$/$STB$).$