Seismic Facies of Slope Basin Turbidite Reservoirs, East Breaks 160–161 Field: Pliocene-Pleistocene, Northwestern Gulf of Mexico
The East Breaks Block 160–161 oil and gas field lies 160 km (100 miles) offshore of Galveston, Texas in the northwestern Gulf of Mexico and produces from four Pliocene to Pleistocene petroleum reservoirs interpreted as deep-water turbidite deposits. The oldest (Glob Alt) reservoir is middle to late Pliocene and occurs about 80 km (50 miles) downslope from its age equivalent shelf/slope break. The youngest (Trim A) reservoir is middle Pleistocene and occurs only 10–16 km (6–10 miles) down-slope from its age-equivalent shelf/slope break. Electric-log correlations and seismic facies analysis for both of these reservoirs suggest they are channel-fill deposits that fed aggradational depositional lobes. Biofacies indicate deposition in middle to upper bathyal water depths (deeper than 200 m or 600 feet).
Seismic facies analysis shows that both the youngest and oldest reservoir intervals correlate with discontinuous, variable amplitude, hummocky reflection character. The mapped pattern of this hummocky seismic facies has a linear to lobate pattern determined by intraslope basin geometry within the Trim A and a lobate distribution at the Glob Alt. These hummocky seismic facies occur within the isochron thicks of the Block 160–161 salt-withdrawal basin and correlate with sandstone intervals in wells penetrating the hummocky facies. Depositional models for the Trim A and Glob Alt reservoirs include deltas that prograded to the shelf-edge during sea level lowstand where sands were transported to slope environments by turbidity currents following topographic lows. Sediments accumulated as aggradational thicks consisting of sheet, lobe, and channel deposits within the intraslope basin.
The Trim A reservoir is interpreted as a small, intraslope basin, turbidite system. The Glob Alt reservoir is interpreted as a local depositional lobe of a much larger slope basin, turbidite system.
KeywordsSeismic Profile Seismic Facies Turbidite System Crevasse Splay Reservoir Interval
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