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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
The Cogdell Field Study, Kent and Scurry Counties, Texas: A Post-Mortem
Abstract
The Cogdell Field, a large, sea level highstand bank complex in the eastern portion of the Horseshoe Atoll, was originally divided into six discrete zones (in 1974) based on fusulinids. Two of these zones could then be further subdivided on the basis of facies correlations, exposure surfaces and log correlations for a total of nine zones. Facies distributions were originally mapped within each zone based on cores and samples and related to porosity and permeability trends. The results of this study were used to re-direct the waterflood and drill infill wells to improve production under secondary recovery.
Comparisons are drawn between what could be done in 1974 and what can be done in 1991, to understand the reservoir response to waterflooding. The more detailed biostratigraphic zonation available today, along with a better understanding of glacio-eustatic controls on carbonate cycles and facies, allows a much more detailed breakdown of a large carbonate reservoir system, which in turn allows a much better understanding of how the buildup functions as a reservoir.
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