Stratigraphic framework and reservoir characteristics of the 'Springer' sandstones, eastern Anadarko Basin, Oklahoma

Scope and Method of Study: The Springer interval was analyzed in a nine square township area within the eastern Anadarko Basin, Oklahoma. Data from core and 640 wireline logs were integrated to determine electrofacies, map distribution of sandstones, determine depositional environments and characterize lithotypes and porosity.;Findings and Conclusions: The Springer interval in the eastern Anadarko Basin, Oklahoma contains at least three prominent depositional cycles that are bounded by disconformities and contain sandstone, gray marine shale, and thin radioactive "hot" shale. Evidence for the sequence bounding disconformities includes deeply incised valleys that erode the underlying "hot shale" in the subjacent sequence. These "hot shales", which are interpreted as representing maximum flooding surfaces, form the basis for the chronostratigraphic framework for the Springer interval. Core analysis, sandstone distribution and geometry were used to establish that Springer sandstones in the study area are dominantly of marine origin and contain normal marine fauna and evidence of bidirectional flow. No cores were taken in the incised valley fill sandstone bodies and their interpretation is based on distribution patterns and their spatial relationship with older "hot" shale markers. The majority of Springer sandstones mapped as narrow, elongate, northwest to southeast trending sand bodies, and exhibited log profiles indicative of marine offshore bars. The other trend observed in thickness mapping and electrofacies interpretation contained anomalously thick sands that trended primarily north to south. Analysis of log profile geometry and thickness mapping provided the interpretation of a north/south trending incised channel complex, which is an extension of the Old Woman Channel (Davis 1973) mapped in T.14N.,R.11W.