Contribution of Outcrop Data to Improve Understanding of Field Performance: Rock Exposures at Eight Foot Rapids Tied to the Aneth Field
Donald A. Best, Frank M. Wright, III, Rajiv Sagar, L. James Weber, 1995. "Contribution of Outcrop Data to Improve Understanding of Field Performance: Rock Exposures at Eight Foot Rapids Tied to the Aneth Field", Hydrocarbon Reservoir Characterization: Geologic Framework and Flow Unit Modeling, Emily L. Stoudt, Paul M. Harris
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Building an accurate geologic model of a reservoir from well data is a challenge. Subsurface geologic data exhibit considerable variability, and interpretations are dependent on well data that are widely spaced. Outcrop analogs provide an additional source of data. Outcrops are used by geoscientists to gain a better understanding of subsurface geology, particularly reservoir architecture. Reservoir engineers would do well to follow the geoscience lead and use outcrop depiction to investigate how reservoir architecture might influence fluid flow. Rock exposures at Eight Foot Rapids exhibit an excellent Aneth Field reservoir analog, in all its detail. This locality is used to construct a model suitable for investigating, in cross section, the interwell behavior of a waterflood of the Aneth Field algal buildup reservoir. The work is particularly useful for demonstrating the impact of heterogeneity on unsteady state waterflood performance. Results illustrate the consequences of alternative well-to-well correlations.
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This collection of papers presents documentation for (1) approaches to be taken in developing a geologic framework for explaining layering, heterogeneity, and compartmentalization of a reservoir; (2) the value of outcrop data in improving understanding of reservoir performance; (3) methods for integrating, analyzing, and displaying geologic, petrophysical rock property, and engineering data to be used during field evaluation, management, and simulation; (4) geostatistical approaches that are being used to characterize the spatial distribution of reservoir properties and augment geologic descriptions, and (5) methods of displaying quantitative models of reservoir properties and reservoir simulation in three dimensions.