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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.
Sandstone is a clastic sedimentary rock that is made up of cemented sand grains (usually quartz) and has a gritty feel to it.  this is the term uesed when sand has be â¦ en compacted together under such force so as to be turned into a solid mass rather than individual grains of sand. it looks weird.ockhound. Accumulating deposits of sand from wind or water deposition are initially created. The weight from the deposits above cause compaction of the lower deposits. Compaction forces out air and water that exists between the sand grains.