The dependence of sandstone reservoir quality on composition has been recognized in numerous empirical studies (e.g., Hayes and others, 1976; Nagtegaal, 1978; Selley, 1978; Seeman and Scherer, 1984; Scherer, 1987; Smosna, 1989) and in experimental studies (Pittman and Larese, 1991). The composition and relative abundance of detrital components in sands greatly influence both physical and chemical diagenesis and, thus, reservoir quality. The purpose of this chapter is to discuss some of the effects of detrital composition on porosity and permeability and then review evaluation of mineral composition of a potential reservoir prior to drilling.
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Reservoir Quality Assessment and Prediction in Clastic Rocks
This course is designed to emphasize the following topics: (1) Historical perspective on previous and current empirical, and geochemical methods of reservoir quality prediction; (2) Overview of diagenetic processes which significantly impact reservoir quality and those factors which act as major controls on those processes; (3) Proper design of a comprehensive or limited-focus predictive analysis of reservoir quality; (4) Methodologies for the accurate measurement of all major dependent and independent variables; (5) Data analysis techniques involved in quality control and the assessment of variability prior to performing multivariate regression; (6) Steps involved in the generation of a multivariate regression to insure that the model developed provides maximum accuracy using a minimum number of independent variables; (7) Case histories from a variety of settings illustrating application of the recommended approach to reservoir quality prediction.