Mississippi Canyon

The Mississippi Canyon is an undersea canyon, part of the Mississippi Submarine Valley in the North-central Gulf of Mexico, south of Louisiana. According to the U.S. Geological Survey GLORIA Mapping Program, it is the dominant feature of the north-central Gulf of Mexico. According to GCAGS Transactions, it has an average width of 8 kilometres (5.0 mi), and a length of 120 kilometres (75 mi). The US Minerals Management Service (MMS) applies the name Mississippi Canyon to numbered federal oil and gas lease blocks over a large offshore area centered on, but mostly outside, the submarine canyon.

According to "Deepwater Gulf of Mexico 2004: America's Expanding Frontier", a report issued by the Minerals Management Service (MMS) Gulf of Mexico OCS Region, of the ten deepwater discoveries in water depths greater than 7,000 ft (2,134 m), three were in the Mississippi Canyon area: Aconcagua project, area/block MC305, 7,379 ft (2,249 m) deep; and Camden Hills project, MC348, 7,530 ft (2,300 m) deep, both discovered in 1999; and Blind Faith project, MC696, 7,116 ft (2,169 m) deep, discovered in 2001. In a separate section of the same report, note is made of acreage in the Thunder Horse project, MC778, acquired in 1988. Other projects noted for Mississippi Canyon include Thunder Horse areas/blocks MC775-778 and MC819-822, listed as completed grid PEA (programmatic environmental assessment) by BP.

An MMS list of 80 development systems of productive deepwater Gulf of Mexico projects from 1979 to 2003 includes 29 projects in the Mississippi Canyon area:

Five of the top 20 deepwater Gulf of Mexico production blocks for 2000-01 were in the Mississippi Canyon, including the top 2: Project Mars, 2,933 feet (894 m) deep, 137 million barrels (21.8×10^⁶ m³) of oil equivalent (BOE); project Ursa, 3,800 feet (1,200 m) deep, 93 million barrels (14.8×10^⁶ m³) of BOE; project Mensa, 5,280 feet (1,610 m), 27 million barrels (4.3×10^⁶ m³) of BOE; Cognac, 1,023 feet (312 m), 23 million barrels (3.7×10^⁶ m³) of BOE; Crosby, 4,259 feet (1,298 m), 18 million barrels (2.9×10^⁶ m³) of BOE, all managed by Shell.

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