--> ABSTRACT: Grain Size, Diagenesis and Permeability Prediction in Reservoir Sands, by C. M. Prince, R. Ehrlich, and C. J. Murray; #91021 (2010)
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Grain Size, Diagenesis and Previous HitPermeabilityNext Hit Previous HitPredictionNext Hit in Reservoir Sands 

PRINCE, C. M., R. EHRLICH, and C. J. MURRAY

Modern procedures in basin history analysis can predict approximate grain size as a function of depositional environment and basin location. The relationship between grain size and Previous HitpermeabilityNext Hit is approximately known for unconsolidated sediments. This relationship is modulated by diagenesis in lithified sandstones. In unlithified sands, log Previous HitpermeabilityNext Hit is proportional to log grain size with a constant of proportionality ranging from 1.2 to 1.7. Diagenesis may change this coefficient or render the relationship more diffuse- such changes may be a way to quantify the degree of diagenesis in a Previous HitsandstoneNext Hit. Such quantification requires a way to measure grain size from thin section that is insensitive to the biases due to the effect of sectioning and to the existence of quartz overgrowths. Fourier analysis of binary images of thin sections can provide this information because the distances between pore centers are the same as between grain centers and remnants of intergranular Previous HitporosityNext Hit tend to remain even after considerable diagenesis. Results from analysis of the Perry Previous HitSandstoneNext Hit (Carboniferous) illustrate the procedure. The plot of grain size vs. Previous HitpermeabilityTop displays two relationships; 1) for sandstones with homogeneous texture the constant of proportionality is approximately five; 2) for samples containing patchy carbonate cement the constant is approximately seven, a value so great as to be of little practical value. 

AAPG Search and Discovery Article #91021©1997 AAPG Annual Convention, Dallas, Texas.