Detailed sample studies are necessary to evaluate the porosity and permeability characteristics of carbonate reservoirs. Depositional porosity fabrics and the resultant permeability are varied, and may range from highly porous impermeable chalk to less porous but more permeable intergranular porosity in carbonate banks, which may be composed of pellets, oolites, or admixtures of fragmental debris. Tectonism can alter the basic porosity-permeability relations by means of fracturing, recrystallization, and/or tectonic dolomitization. These varied porosity fabrics can be recognized by sample and core examination; a method of qualitative and quanitative logging is suggested.

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