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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Glacio-Eustatic Sea Level Fluctuations and the Formation of Pennsylvanian Age Carbonate Reservoirs in the Permian Basin of West Texas
Abstract
Glacio-eustatic sea level fluctuations with magnitudes on the order of 450 feet and a frequency of approximately 100,000 years had a profound effect on the formation of many Pennsylvanian age reservoirs in the Permian Basin. These reservoirs can consist of reefs, banks, bars or shoaling-upward cycles, in either a high stand or low stand position. High stand carbonates were deposited during relatively short periods of time and subsequently underwent longer periods of subaerial exposure, dissolution and erosion. Combined with more or less continuous basin subsidence this resulted in stacked cycles on carbonate platforms such as the Horseshoe Atoll. On gently dipping shelf areas it resulted in the landward migration of successively younger reservoir systems although some stacking occurred along shelf edges. Fusulinid age dating and environment of deposition analysis from well cuttings are useful in both the exploration for and exploitation of these reservoirs.
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