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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.
 Importance  Formation comppy gressibility can have a significant impact on reservoir performance  Subsidence can have significant environmental impact  Typypes  Matrix Compressibility (C m): relative change in volume of solid rock material (grain volume) per unit pressure change (usually C m â0).verburden pressure depends on: depth, structure, consolidation of the formation, gggg yeologic age and history of the rock. Overburden Pressure and Rock Compressibility. Pore pressure and effective overburden pressure: The weight of the overburden simply applies a compressive force to the reservoir.