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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Permian Clear Fork, North Robertson Unit: New Insights into Old Problems
Abstract
Systematic study of new and existing core samples from the Clear Fork Group (Leonardian) in North Robertson Unit suggests a new facies model for deposition of this interval. This model proposes deposition took place under hot and humid conditions in a complex array of specific environments, ranging from nearshore marine, shoal, reef, and island complexes, to lagoonal, tidal flat, and supratidal settings. Vegetal covering of island and supratidal areas was intermittently widespread. In the upper part of the Clear Fork, where peritidal and lagoonal facies dominate, solution collapse breccias testify to fresh water invasion during periods of sea level lowstand. The implications of this new model for Clear Fork reservoir development are significant. Targeted infill drilling of lagoonal facies and more study of solution breccias in the upper part of the Clear Fork, to determine their reservoir or “thief zone” potential, are among such implications.
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