Lecture-4, Slide 15: Total Oil In Place calculation formula. Water Saturation Sw is not given but you can use Archie's equation given below to calculate Sw: sw=21XRtR Given values for your problem are: - Area(A)=100 acres - Net pay thickness (h)=75 feet - Porosity ()=0.2 - Bo=0.75 (oil shrinkage factor) - Rw=1.1 ohm-meter (formation water resistivity) - Rt=100ohm-meter (True formation resistivity in the oil zone, determined from wireline logs) 1. Calculate Sw using the Archie's equation given above and select your answer -> 2. Determine the Total Oil In Place in Barrels and select your answer ->