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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.
Characteristics of compaction drive reservoirs. Compaction drives characteristically exhibit elevated rock compressibilities, often 10 to 50 times greater than normal. Rock compressibility is called pore volume (PV), or pore, compressibility and is expressed in units of PV change per unit PV per unit pressure change.Rock compressibility is a function of pressure. Normal compressibilities range from 3 to 8 Ã 10 â6 psi â1 at pressures greater than approximately 1,000 psia.In contrast, elevated rock compressibilities can reach as high as 150 Ã 10 â6 psi â1 or higher at comparable pressures.ock compressibility is a function of pressure. Normal compressibilities range from 3 to 8 Ã 10 â6 psi â1 at pressures greater than approximately 1,000 psia. In contrast, elevated rock compressibilities can reach as high as 150 Ã 10 â6 psi â1 or higher at comparable pressures.