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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.
First, sandstones are easily studied because they contain sand sized grains that can easily be distinguished with a petrographic microscope. Second, most of the world's oil and natural gas is found in sands or sandstones because of their generally high porosity.Classification For this course we will use a classification of sandstones that is partially based on Blatt and Tracey (p. 257) and partially based on Williams, Turner, and Gilbert (p. 326).econd, most of the world's oil and natural gas is found in sands or sandstones because of their generally high porosity. Classification For this course we will use a classification of sandstones that is partially based on Blatt and Tracey (p. 257) and partially based on Williams, Turner, and Gilbert (p. 326).