MIOCENE EXAMPLE OF A MEANDERING SUBMARINE CHANNEL-LEVEE SYSTEM FROM 3-D SEISMIC REFLECTION DATA, GULF OF MEXICO BASIN
JOHN T. ROBERTS, BEHTAZ COMPANI, 1996. "MIOCENE EXAMPLE OF A MEANDERING SUBMARINE CHANNEL-LEVEE SYSTEM FROM 3-D SEISMIC REFLECTION DATA, GULF OF MEXICO BASIN", Stratigraphic Analysis Utilizing Advanced Geophysical, Wireline and Borehole Technology for Petroleum Exploration and Production, Jory A. Pacht, Robert E. Sheriff, Bob F. Perkins
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Submarine fan models and outcrop studies of turbidites have emphasized sand-rich systems which correspond to Type I and II fans of Mutti (1985). Type III fans, which are channel-levee systems, have been considered to be shaly “slope fans,” but can occur as “basin floor fans.” They can contain good quality sand and laminated sand/shale reservoirs in channel, levee, and splay facies, as illustrated by well logs and outcrops of analog Paleozoic and Mesozoic rocks. Characteristics of channel-levee systems are known chiefly from seismic and sonar studies of Pleistocene to Recent sediments and the defining characteristics of these systems are difficult to recognize in outcrop. We illustrate a Miocene example of two adjacent meandering channel-levee systems with associated splays using a flattened time slice and sections from a 3-D survey. The systems are located about 75 miles (120 km) south of the coeval shelf edge, in what was deep bathyal water. They are not interpretable as such on 2-D seismic data, nor are the details of the channels and splays mappable on 2-D seismic data. Logs from a well which penetrated levee facies about 150 feet (45m) thick indicate 60/40 sand/shale with good laminated reservoir quality. Channels about 500 feet(150m) wide meander over a belt nearly 2 miles (3.2 km) wide and have levees forming a belt over 2.5 miles (4km) across. Splays up to a mile (1.6 km) across are present and may be the best targets for drilling.