a. A clean limestone water-bearing formation displays a true resistivity of 7.0 22 m and formation water resistivity of 0.02 m. Give your best estimate of the formation porosity. b. An adjacent oil-bearing limestone zone displays a true resistivity of 28 -m. Give your best estimate of the oil saturation. c. To estimate the value of oil saturation in Part b, you had to opt for several assumptions. What are these assumptions and how do you justify each of them?