Calculate porosity, water saturation, oil saturation, gas saturation, and lithology from the following core analysis data. How should the saturations you have calculated compare with the fluid saturations in the reservoir?
Oil well core cut with an oil base mud:
• Sample 1 weighed 130 gm and was found to have a bulk volume of 51.72 CC
• Sample 2 weighed 86.71 gm, and from the retort method was found to contain 1.90 cc of water and 0.87 cc of oil
• Sample 3 weighed 50 gm and contained 0.40 cc of gas space Assume rw = 1.0 gm/cc Oil gravity = 40 °API