Computer-assisted mapping of 'Cherokee' sandstone trends, by reference to spontaneous potential curves, in parts of Creek, Lincoln, and Payne counties, Oklahoma

Scope and method of study. The purpose of this study was to see if trends of "Cherokee" sandstones within the study area could be mapped effectively, for petroleum exploration, if (a) sandstones are defined relative to the spontaneous potential curve only, if (b) sandstones are mapped by aggregate thickness, and if (c) sandstones are mapped by geologic software such as Geographix by Landmark Graphics Corporation. Data was used from scout cards, state completion reports, small scale electric logs and electronic data provided by IHS Energy. Thirteen stratigraphic cross-sections and thirteen structural cross-sections were constructed in grid pattern across the study area. Structural contour maps were and isopach maps of aggregate sand thickness were constructed for the "Cherokee" sandstones.; Findings and conclusions. Maps of the "Cherokee" sandstones could be mapped effectively for petroleum exploration using the three criteria set forth. These maps are efficient as a first-approximation for the distribution and configuration of the reservoirs. The Geographix software is adequate for providing useful documents quickly and easily. It can contour structure maps adequately but lacks the "human intuition" to contour the sandstone isopach maps reasonably.