Outcrop Analog for Mixed Siliciclastic–Carbonate Ramp Reservoirs—Stratigraphic Hierarchy, Facies Architecture, and Geologic Heterogeneity: Grayburg Formation, Permian Basin, U.S.A.

摘要

The Grayburg Formation (Late Permian, Guadalupian) is a shallow-marine succession flanking the Delaware and Midland basins of Texas and New Mexico, U.S.A. The Grayburg exemplifies the facies heterogeneity imparted by cyclic interbedding of siliciclastic and carbonate rocks from lithologically diverse, inner-ramp to outer-ramp facies assemblages. High-resolution correlation and mapping of laterally continuous Grayburg strata exposed in the Brokeoff Mountains, New Mexico, allow the stratigraphic architecture, facies distribution, and lateral variability to be characterized in detail. This study provides an outcrop analog for stratigraphically equivalent subsurface reservoirs and comparable carbonate-ramp reservoirs that accumulated during periods of low-amplitude sea-level fluctuations.