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Estimate the total reservoir compressibility for a sandstone formation that is characterized by a porosity of 25%. The reservoir is undersaturated (i.e., no initial gas cap is present) and the oil and water saturations are 70 and 30%, respectively.stimate the total reservoir compressibility for a sandstone formation that is characterized by a porosity of 25%. The reservoir is undersaturated (i.e., no initial gas cap is present) and the oil and water saturations are 70 and 30%, respectively.
For example the porosity of sandstones can be very variable, anywhere between 5 and 30 % so potentially a 1m3 mass of sandstone with a porosity of 30% may be able to absorb as much as 300 litres of water.