--> Abstract: Influence Of Microscopic Heterogeneity On Reservoir Quality In Carbonate Reservoirs, by D. J. Benson and E. A. Mancini; #90928 (1999).
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BENSON, D. JOE, and ERNEST A. MANCINI
Center for Sedimentary Basin Studies and Department of Geology, University of Alabama, Tuscaloosa, AL 35487

Abstract: Influence of Microscopic Heterogeneity on Previous HitReservoirNext Hit Quality in Carbonate Reservoirs

The quality of carbonate petroleum reservoirs is a product of not only the overall Previous HitporosityNext Hit and permeability of the Previous HitreservoirNext Hit, but also the variation in these attributes within the Previous HitreservoirNext Hit lithology. Variation in Previous HitporosityNext Hit and permeability within a Previous HitreservoirNext Hit or Previous HitreservoirNext Hit compartment is a reflection of heterogeneity in the Previous HitreservoirNext Hit lithology. Heterogeneity can occur at megascopic to microscopic scales. Megascopic and macroscopic heterogeneities influence produceability by defining individual reservoirs or Previous HitreservoirNext Hit compartments, microscopic heterogeneity controls the produceability within these reservoirs or compartments.

Microscopic heterogeneities can be classified as depositional, diagenetic, and/or structural. Depositional heterogeneities include laminae, grain size, sorting, and infiltered micrite. Diagenetic heterogeneities are the product of cementation, dissolution, dolomitization, and compaction. Structural heterogeneities include microfractures, microfaults, and stylolites.

The level of microscopic heterogeneity can vary dramatically within individual reservoirs or Previous HitreservoirNext Hit compartments. While accurate evaluation of microscopic heterogeneity requires comprehensive megascopic and microscopic examination of Previous HitreservoirNext Hit lithologies, estimates of heterogeneity can be developed based on an understanding of the depositional setting and diagenetic history of the Previous HitreservoirNext Hit unit.

Variation in microscopic heterogeneity can influence the overall produceability of a Previous HitreservoirNext Hit and can affect the accuracy of recovery estimates based on average Previous HitporosityNext Hit and permeability values. The produceability of a microscopically homogeneous. Previous HitreservoirNext Hit can be adequately predicted by evaluation of Previous HitporosityNext Hit and permeability data derived from core analysis or petrophysical data. These data, however, are much less efficient in Previous HitpredictingNext Hit Previous HitreservoirTop performance for reservoirs with high degrees of microscopic heterogeneity.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas