Depositional Setting, Facies, and Petroleum Geology of Boatwright Sandstones (Springer Group) in Parts of Caddo, Canadian, and Blaine Counties, OK

Abstract

Primary objectives of this study were to examine the depositional setting and establish sandstone facies, distribution, and petroleum geology for the Boatwright sandstones. Depositional setting was determined from cross-section generation, core analysis, and core-correlated wireline electrofacies. All data were integrated to explain the petroleum geology of the hydrocarbon-bearing zones. Boatwright sand deposition occurred in a shelf setting and is characterized as two cycles of regression to transgression in response to basin subsidence and sea-level fluctuations. Glacially-induced sea-level change is proposed as a possible mechanism for Boatwright depositional pattern. Tectonism is also a possible mechanism for Boatwright deposition. Distributary channel, sheet sandstone, valley-fill sandstone, and marine shale facies are proposed for the Boatwright interval. The Boatwright hot shale represents maximum flooding during the Boatwright cycle. The boundary between the Boatwright and overlying Britt cycle is placed at the erosional surface beneath the Old Woman Channel. Boatwright sandstones are high volume petroleum reservoirs that trap due to facies changes, variable porosity, and up-structure termination of sandstone.