Part 4 - Berg - Hughes Center

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northern Louisiana. Dickinson stated that the lower member of the Buckner is time- equivalent to part of the upper member of the Smackover, but the upper Buckner grades basinward into the Bossier Formation. The Buckner calcarenite zones coalesce at the south edge of the Haynesville field to form a bank up to 600 ft thick, which extends regionally along the basinward edge of the shelf slope, a zone of active subsidence. Dickinson (1969) stated that the older zones of the Buckner calcarenite appear to be limited to the south flanks of Haynesville and Red Rock fields, and that the "A" zone is developed on a regional scale across North Louisiana and is known to extend from Texas nearly to Mississippi. The trends vary from east to west to northwest, with a beach deposit forming at the seaward edge of the shelf-slope break during the Buckner regression. In summary, the Haynesville-Buckner consists of fine-grained sandstones, shales, bedded anhydrite, and oolitic limestone that were deposited in a shallow marine environment. Hydrocarbons were primarily sourced from the underlying Smackover Formation basinal deposits and are stratigraphically trapped in multiple, stacked, ooid shoal pinch-outs. With respect to the reservoirs, the depth to top of pay is from 9,400 to 10,750 ft. Porosity ranges from 9 to 16% and permeability from 50 to 400 md. Produced hydrocarbons consist of 42º API gravity oil, condensate, and gas. Upper Jurassic (Cotton Valley) Cotton Valley Group Producing Parishes 355
Caddo, Bossier, Webster, Claiborne, Lincoln, Union, Ouachita, De Soto, Bienville, Winn, Natchitoches, Jackson, Morehouse The Cotton Valley Group in southern Arkansas and northern Louisiana has been extensively studied (Crider, 1938; Imlay, 1943; Swain, 1944; Forgotson, 1954; Sloane, 1958; Mann and Thomas, 1964; Thomas and Mann, 1966; Collins, 1980; Coleman and Coleman, 1981; Eversull, 1985; Zimmerman, 2000). The Cotton Valley consists of the Schuler and Bossier formations and lies unconformably on the Louark Group. The uppermost Schuler Formation, predominantly composed of sandstone and siltstone, is unconformable to and oversteps the Bossier Formation (mainly shale) near the basin margins. Continuous deposition occurred in the deeper parts of the basin. The basal Cretaceous Coahuilan Series rests unconformably on the Schuler Formation of the Upper Jurassic Cotton Valley Group. Swain and Anderson (1993), in ascending order, divided the Cotton Valley Group into the Millerton, Shongaloo, and Dorcheat formations. They defined the Millerton as dominantly a siliciclastic shelf unit that was deposited over the Haynesville Formation and used it in place of the Bossier Shale. These authors described the Shongaloo Formation as typical foreshelf and shelf edge silty shales and sandstones, in part, calcareous. They assigned the name Dorcheat Formation to the uppermost unit below the Hosston Formation and used it in reference to the Schuler. Kornfeld (1985) described the sandstones of the upper Cotton Valley Group of Mississippi, northern Louisiana, and eastern Texas as being deposited on a stable but subsiding shelf. The quartz-rich regressive sandstones are described as being deposited in a complex of deltaic and marine systems. The sediments of the Cotton Valley fluvial- deltaic systems were derived from Paleozoic and younger highlands to the north and 356
Page 1 and 2: time frame spanning from approximat
Page 3 and 4: the same well, Pennsylvanian plant
Page 5 and 6: Louann Salt The Louann Salt conform
Page 7 and 8: Norphlet deposition, in southern Ar
Page 9: Haynesville-Buckner Formation Produ
Page 13 and 14: Smackover limestone. The Bossier gr
Page 15 and 16: Lower Cretaceous Coahuila (Hosston,
Page 17 and 18: system that includes a variety of d
Page 19 and 20: greater than 90 md, most of the Tra
Page 21 and 22: contains approximately 13 producing
Page 23 and 24: Pine Island shale, averaging 250 ft
Page 25 and 26: 10%. Calcite-lined vugs and intergr
Page 27 and 28: Lake Anhydrite was deposited above
Page 29 and 30: Sabine, Franklin, Tensas Shallow wa
Page 31 and 32: Across northern Louisiana in the pr
Page 33 and 34: Taylor Group Producing Parishes Cad
Page 35 and 36: 2,000 to 2,500 ft with net pay of 1
Page 37 and 38: productive in east-central Louisian
Page 39 and 40: North Louisiana Salt Basin. The str
Page 41 and 42: Louisiana Salt Basin. Lower Cretace
Page 43 and 44: Table 2. Oil and gas production for
Page 45 and 46: 1987; Claypool and Mancini, 1989; M
Page 47 and 48: Figure 329. Cross section A-A’. G
Page 49 and 50: generation (Table 4). The following
Page 51 and 52: Table 5. Cotton Valley-Bossier Grou
Page 53 and 54: Table 6. Cotton Valley-Group sample
Page 55 and 56: Table 7. Wells used to construct th
Page 57 and 58: Figure 336. Electric logs for wells
Page 59 and 60: Figure 338. Thin section micrograph
Page 61 and 62:
Figure 340. Amoco CZ 5-7 well elect
Page 63 and 64:
Table 9. Total organic carbon, rock
Page 65 and 66:
Figure 343. HI versus OI diagram. T
Page 67 and 68:
Figure 345. Rock-Eval pyrolysis ana
Page 69 and 70:
Figure 347. Visual kerogen analyses
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gas with some oil, not only within
Page 73 and 74:
Figure 350. Burial history profile
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Figure 352. Hydrocarbon expulsion p
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Figure 354. (A) Thermal-maturity an
Page 79 and 80:
Figure 356. Cross section A-A’ sh
Page 81 and 82:
Figure 360. Cross section J-J’ sh
Page 83 and 84:
Figure 364. Seismic cross section B
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of secondary, non-associated thermo
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RESULTS AND DISCUSSION Geologic His
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peripheral fault trend and numerous
Page 91 and 92:
oundary between thick transitional
Page 93 and 94:
Cretaceous reservoirs have shown th
Page 95 and 96:
from the southern part of the basin
Page 97 and 98:
Reservoir Assessment Comparison of
Page 99 and 100:
For example, Upper Cretaceous sands
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The Upper Jurassic to Lower Cretace
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Bishop, W.F., 1968, Petrology of up
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Dawson, W.C., and Callender, C.A.,
Page 107 and 108:
Fisher, W.L., and McGowen, J.H., 19
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Hermann, L.A., J.A. Lott, and R.E.
Page 111 and 112:
Mancini, E.A., M. Badali, T.M. Puck
Page 113 and 114:
McCulloh, R.P., and Eversull, L.G.,
Page 115 and 116:
Source Rock Potential of Carbonate
Page 117 and 118:
Salvador, A., 1991b, Triassic-Juras
Page 119 and 120:
Tolson, J.S., C.W. Copeland, and B.
Page 121:
Zimmerman, R.K., 1999a, A potential
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