Abstract: Regional Correlations and Reservoir Characterization Studies of the Morrow Group in the Anadarko Basin Area of Western Oklahoma
Craig M. Williams, Walter J. Hendrickson, Paul W. Smith
Reservoir characterization studies of numerous fields within the Anadarko Basin area have demonstrated nomenclature problems regarding Morrowan Aged reservoirs. The Morrow can be overlaid by strata as young as basal Des Moinesian and underlaid by strata that is Springeran to Chesterian in Age. This problem has led to Morrow production being erroneously called as young as Red Fork (Des Moinesian) and as old as Chester. To further complicate nomenclature, a correlative and equivalent formation may be called various names from one region of the basin to another and/or may be known by local names from one field to another. Misallocated Morrow production is carried incorrectly throughout the production history of the well. Further, this misallocated production is then used by arious State and Federal agencies to model reserves and to create energy policies. To date, few detailed regional cross-sections have been available (or even exist outside proprietary studies) showing the most up-to-date logs correlated throughout the basin. By using regional cross-sections the stratigraphic relationships between the Morrow and overlying and underlying formations are clearly demonstrated.
Reservoir characterization occurs after cross-section grids have established that all log correlations tie intra-field as well as inter-field. Production was allocated by comparing the perforated interval to the log which was correlated to the correct reservoir. Characterization of the reservoirs was conducted to include geologic and engineering data such as depths, thicknesses, porosities, permeabilities, pressures, water saturations, area, spacings, and heterogeneities along with a correlated reservoir specific type log. The results of those studies are presented.
AAPG Search and Discovery Article #90957©1995 AAPG Mid-Continent Section Meeting, Tulsa, Oklahoma