Abstract
Models of porosity formation in carbonate rocks have stressed subaerial exposure and attendant shallow meteoric diagenesis. Porosity formation also occurs in deep-burial, or mesogenetic, settings as a result of dissolution enlargement of preexisting pores (porosity enhancement) and creation of new pore systems. Brines charged with organic acids, carbon dioxide, and/or hydrogen sulfide derived from organic matter diagenesis and thermochemical sulfate reduction are the likely fluids causing significant mesogenetic dissolution. Enhanced and newly created mesogenetic pore types can mimic pore types formed in shallow meteoric environments, and therefore, the mesogenetic origin of some porosity may go unrecognized.
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