2. A resistivity log and a density log were used to obtain the following data: Formation resistivity (shallow investigation tool) = 5 ohm m Formation resistivity (deep investigation tool) = 25 ohm m The formation water resistivity is 0.05 ohm m. The mud filtrate resistivity is 0.1 ohm m. The rock porosity from the density log is 0.2. Archie's parameters: a=1, m=2, n=2 (a) Estimate the water saturation in this zone. (15 points) (b) Estimate the moveable oil saturation in this zone. (15 points) 3. Consider the reservoir formed by two layers of sand separated by a shaly sand shown below. Sand (7940 to 7900'), k = 200md Shaly sand (7980' to 7940'), k = 20 md Sand (8000' to 7980'), k = 200 md Sketch the SP log across this zone. Assume that Rmf > Rw. (30 points)