The Impact of Vertical Averaging on Hydrocarbon Volumetric Calculations—A Case Study
Larry E. Denver, Danny C. Phillips, 1992. "The Impact of Vertical Averaging on Hydrocarbon Volumetric Calculations—A Case Study", Computer Modeling of Geologic Surfaces and Volumes, David E. Hamilton, Thomas A. Jones
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Accurate hydrocarbon volumetrics can only result from detailed reservoir description. Two-dimensional techniques have traditionally served to quantify reservoir description. However, two-dimensional characterization of three-dimensional heterogeneities may not yield acceptable volumetric analysis in heterogeneous reservoirs. The primary pitfall in the traditional methodology is the inherent vertical averaging. In the case studies that follow, volume discrepancies as high as 21% are documented between three-dimensional modeling and two-dimensional mapping. This paper focuses on the deleterious impact of vertical averaging on reservoir characterization and hydrocarbon volumetric calculations and demonstrates that three-dimensional geologic block modeling is a more accurate alternative to traditional volumetric techniques.