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844 Desktop
The Gulf of Mexico (GOM) is the 9th largest body of water on earth, covering an area of approximately 1.6 million km2 with water depths reaching 4,400 m (14,300’). The basin formed as a result of crustal extension during the early Mesozoic breakup of Pangaea. Rifting occurred from the Late Triassic to early Middle Jurassic. Continued extension through the Middle Jurassic combined with counter-clockwise rotation of crustal blocks away from North America produced highly extended continental crust in the subsiding basin center. Subsidence eventually allowed oceanic water to enter from the west leading to thick, widespread, evaporite deposition. Seafloor spreading initiated in the Late Jurassic eventually splitting the evaporite deposits into northern (USA) and southern (Mexican) basins. Recent work suggests that this may have been accomplished by asymmetric extension, crustal delamination, and exposure of the lower crust or upper mantle rather than true sea floor spreading (or it could be some combination of the two).
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846
Mesozoic Carbonate Rafts Above and Keel Structures at the Base of Shallow Salt Canopies: Exotic Processes at work in the Deep-water Northern Gulf of Mexico
Seismic correlations and well data confirm that deep-water carbonate beds of Mesozoic age have been found above the shallow allochthonous salt canopy in the northern Gulf of Mexico. These rafts of carbonate strata often overlie equivalent age Mesozoic carbonates in their correct stratigraphic position below the salt canopy. The origin of keel structures is presently not well understood. As deformation occurs after shallow canopy emplacement, the keels are fairly recent developments geologically. Volumetrically few but intriguing observations suggest possible basement involvement in keel formation.
Mesozoic Carbonate Rafts Above and Keel Structures at the Base of Shallow Salt Canopies: Exotic Processes at work in the Deep-water Northern Gulf of Mexico
Mesozoic Carbonate Rafts Above and Keel Structures at the Base of Shallow Salt Canopies: Exotic Processes at work in the Deep-water Northern Gulf of Mexico
845
The Influence of Salt Structures and Salt Deformation on Petroleum Exploration in the Deep-water Northern Gulf of Mexico
Hydrocarbon exploration beneath the shallow allochthonous salt canopy of the ultra-deepwater central Gulf of Mexico has encountered three thick, sand-rich, submarine fan successions that punctuate an otherwise relatively condensed and fine-grained basin center stratigraphy. These sand-rich fans are Late Paleocene, Early Miocene, and Middle Miocene in age and each coincide with periods of very high sediment flux and basin margin instability. They are the primary exploration targets in most ultra-deepwater fields, recent discoveries, and failed exploration tests.
The Influence of Salt Structures and Salt Deformation on Petroleum Exploration in the Deep-water Northern Gulf of Mexico
The Influence of Salt Structures and Salt Deformation on Petroleum Exploration in the Deep-water Northern Gulf of Mexico
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