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Four truths about holes in sandstone underlie current research and unsolved problems of sandstone diagenesis. First, primary intergranular porosity and permeability of sand are greatly reduced and subject to total destruction in the early stages of burial diagenesis. Compaction, cementation, recrystallization, and replacement are widely recognized porosity-reducing mechanisms. Rate of porosity loss with depth is related mainly to original sand composition.

Second, at later stages of diagenesis, secondary porosity can be produced by dissolution, of detrital and authigenic minerals. Porosity can be restored and enhanced at depth. Porosity of many major hydrocarbon reservoirs is mainly secondary, a fact just...

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