Abstract
Hydrocarbons in Frio and younger sediments in South Louisiana, both onshore and offshore, are associated with six types of structural or combination structural-stratigraphic traps: salt domes; circular or elongate End_Page 358------------------------------ domes (which are probably deep-seated salt domes); anticlinal closures associated with regional syn-depositional faults; fault closures; and stratigraphic traps on the flanks of structural noses or closures where no hydrocarbons are trapped on the apex of the structure. The total estimated ultimate recovery of 691 fields in the area is 9,057,003,000 barrels of oil, 2,223,215,000 barrels of condensate, and 85,688,836,000,000 cubic feet of gas. Using an economic value of one barrel of oil equals 15,000 cubic feet of gas, the total ultimate recovery of hydrocarbons is equivalent to 16,959,196,000 barrels of oil. Salt domes account for 17.9% of the number of producing fields, 61.09% of the ultimate oil, 18.48% of the ultimate condensate, and 19.48% of the ultimate gas recovery. Circular or elongate domes account for 20.98% of the producing fields, 18.96% of the ultimate oil, 47.94% of the ultimate condensate, and 47.15% of the ultimate gas recovery. Anticlinal closures associated with regional syndepositional faults account for 20.41% of the producing fields, 12.63% of the ultimate oil, 21.88% of the ultimate condensate, and 22.09% of the ultimate gas recovery. Fault closures account for 31.74% of the producing fields, 6.43% of the ultimate oil, 9.61% of the ultimate condensate, and 9.04% of the ultimate gas recovery. Closures on regional noses account for 3.91% of the producing fields, .56% o the ultimate oil, 1.13% of the ultimate condensate, and 1.29% of the ultimate gas recovery. Stratigraphic traps on flanks of structural noses or closures account for 5.06% of the producing fields, .36% of the ultimate oil, .86% of the ultimate condensate, and .95% of the ultimate gas recovery. End_of_Article - Last_Page 359------------
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