--> ABSTRACT: Multidisciplinary Study to Optimize Reservoir Management of North Penwell (San Andres) Unit, Ector Co., Texas, by W. T. Siemers, D. R. Prezbindowski, V. L. Skinnider, L. C. Maple, M. G. Gerard, M. E. Nagaty, J. J. Howard; #91020 (1995).
[First Hit]

Datapages, Inc.Print this page

Multidisciplinary Study to Optimize Previous HitReservoirNext Hit Management of North Penwell (San Andres) Unit, Ector Co., Texas

W. T. Siemers, D. R. Prezbindowski, V. L. Skinnider, L. C. Maple, M. G. Gerard, M. E. Nagaty, J. J. Howard

A Previous HitreservoirNext Hit Previous HitcharacterizationNext Hit study of the North Penwell (San Andres) Unit was undertaken to optimize a waterflood expansion project. The Permian San Andres Formation in Penwell Field is composed of dolostones deposited as repeated, shallowing-upward, peritidal, carbonate sequences on the eastern shelf of the Central Basin Platform, forming a Previous HitreservoirNext Hit with complex internal geometry. Late-diagenetic dissolution of anhydrite and dolomite, marked by the alteration of anhydrite to gypsum within the subtidal, peloid/skeletal, grain-rich lithofacies, is the major contributor to good porosity development and determines the occurrence of improved Previous HitreservoirNext Hit quality. Ranges In Previous HitreservoirNext Hit quality are linked to variable aspect (pore/throat) ratios derived from a unique combination of iagenetically evolved polymodal pore-size distributions and unimodal throat-size distributions. The best quality Previous HitreservoirNext Hit rocks are dolomitized packstones and grainstones with a well-developed, solution-enhanced, interparticle/grain-moldic pore system of intermediate pore size. The subtidal grain-rich intervals serve as major Previous HitflowNext Hit Previous HitunitsNext Hit within the Previous HitreservoirNext Hit because of their good lateral continuity and internally consistent Previous HitflowNext Hit characteristics.

A pattern/model based on a mixed, open-restricted-closed diagenetic system is proposed in which high-quality Previous HitreservoirNext Hit Previous HitflowNext Hit Previous HitunitsNext Hit grade into layers of anhydrite-cemented dolostones representing the hydrologically less active boundaries of the Previous HitflowNext Hit Previous HitunitsNext Hit. The Previous HitflowNext Hit Previous HitunitsNext Hit defined by the distribution of porosity and permeability identified from the petrologic study were utilized to construct a preliminary 3-dimensional geocellular model. A Previous HitreservoirTop simulation pattern model was used to test the geological model by matching simulation results with field performance.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995