Abstract

Reservoir characterization studies of numerous fields within the Anadarko Basin area have demonstrated nomenclature problems regarding Morrowan Aged reservoirs. The Morrowan strata can be underlaid by strata that is Springeran to Chesterian in age, and overlaid by strata that can be as young as basal Des Moinesian. This problem has led to Morrowan production being erroneously allocated to formations as old as Chester and as young as Red Fork (Des Moinesian). To the authors' knowledge, few detailed regional cross sections have been available, or even exist outside of proprietary studies, showing log correlations throughout the basin. By using regional cross sections the stratigraphic relationships between the Morrowan strata and the underlying and overlying formations are clearly demonstrated.

Reservoir characterization studies were conducted 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 then 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, field specific reservoir type log.