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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
B.C. Canyon Field: A Low Sea Level Stand, Early Canyon Carbonate Buildup
Abstract
During Late Early Canyon time, a series of glacio-eustatically controlled sea level low stands resulted in a carbonate buildup seaward of the Horseshoe Atoll in Howard County, Texas. The resulting satellite or pinnacle reef consists of fringing boundstones, high energy shelf grainstones and lower energy shelf packstones and wackestones with erosional disconformities and associated karst features, and thin, high sea level stand black shales and mudstones.
The original areal extent and thickness of reservoir units were extensively modified by karsting and subaerial exposure. Seismic definition of these fields is complicated by large amounts of clean, non reservoir quality conglomerate derived from the buildups themselves, and by more shaly conglomerates encasing the reservoir package, deposited during rising sea levels. These conglomerates tend to fill in lows between karsted, in situ limestones, thus concealing the topographic relief of reservoir facies.
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