Part 4 - Berg - Hughes Center

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The limestones are 10 to 100 ft thick and are interbedded with shales that are 10 to 30 ft thick. Similar to the other underlying Cotton Valley units, the Knowles in Louisiana grades northward into terrestrial red beds of the Schuler Formation in Arkansas, and in some areas of Louisiana it is overlain conformably by the Cretaceous Hosston Formation. Schuler Formation (Dorcheat Formation) The Schuler Formation consists mainly of shale, but in Arkansas toward the pinch- out of the unit it contains increasing amounts of sandstone (Forgotson, 1954). In fact, near the pinch-out, the formation is entirely sandstone and pebble conglomerate. In southern Arkansas, there is a predominance of nearshore to nonmarine lenticular, fine- grained, red and gray sandstone and shale or mudstone. The lenticular red beds probably accumulated as coastal plain deposits on the coastal side of a lagoon. The red terrigenous siliciclastic sediments extend south in northeastern Louisiana and western Mississippi, where the Schuler is almost totally sandstone. According to Forgotson (1954), a large delta was responsible for the thickness and distribution of the sandstones in northeastern Louisiana and western Mississippi. The Hosston Formation overlies the Schuler Formation disconformably. Approximately 45 reservoirs exist within the Cotton Valley Group. The optimum producing reservoirs consist of fine- to medium-grained, massive barrier bar sandstone and shallow marine oolitic limestone of the Terryville and Knowles formations, respectively. In northern Louisiana, depth to the top of the pay zones range from 3,600 to 14,500 ft. Net pay of the reservoirs ranges from 10 to 60 ft with porosities of 9 to 18% and permeabilities of 1 to 300 md. The produced hydrocarbons are typically 41º API gravity oil, condensate, and gas. 359
Lower Cretaceous Coahuila (Hosston, Sligo) The Sligo and Hosston Formations belong to the Lower Cretaceous Coahuilan Series. The Pearsall, the basal formation of the Trinity Group, conformably overlies the Sligo. The Sligo, consisting of gray to black shale and limestone, grades transitionally downward into the red sandstones and shales of the Hosston. Basinward, both units thicken and the base of the Sligo occurs stratigraphically lower. Hosston Formation Producing Parishes Caddo, Bossier, Webster, Claiborne, Union, Lincoln, De Soto, Bienville, Red River, Natchitoches, Jackson, Ouachita, Caldwell Deposition of predominantly fluvial-deltaic sediments continued during the early Cretaceous in the basin. During Hosston time this deposition included a large variety of lithologies from delta plain to shallow marine shelf environments. According to Rogers (1987), the Hosston Formation overlies the Dorcheat and is of early Cretaceous age. The Hosston Formation contains the early Cretaceous marker spore Cicatricosisporites angicanalis, and the Cretaceous dinoflagellate Oligosphaeridium complex. To the west in Texas, Blount et al. (1986) were able to identify the following five major lithofacies in the Hosston Formation of Trawick field, Nacogdoches County, Texas: (1) a clean, cross- bedded, tidal-channel facies; (2) a sandy, bioturbated, tidal-flat facies; (3) thin, rapidly deposited crevasse-splay deposits; (4) interdistributary bay sands, silts, and muds; and (5) partly reworked distal-deltaic sandstones. These workers observed distribution differences between the upper and lower Hosston. In the lower Hosston, the channel, 360
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 and 10: Haynesville-Buckner Formation Produ
Page 11 and 12: Caddo, Bossier, Webster, Claiborne,
Page 13: Smackover limestone. The Bossier gr
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
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Figure 345. Rock-Eval pyrolysis ana
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Figure 347. Visual kerogen analyses
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gas with some oil, not only within
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Figure 350. Burial history profile
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Figure 352. Hydrocarbon expulsion p
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Figure 354. (A) Thermal-maturity an
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Figure 356. Cross section A-A’ sh
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Figure 360. Cross section J-J’ sh
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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
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oundary between thick transitional
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Cretaceous reservoirs have shown th
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from the southern part of the basin
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Reservoir Assessment Comparison of
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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.,
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Fisher, W.L., and McGowen, J.H., 19
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Hermann, L.A., J.A. Lott, and R.E.
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Mancini, E.A., M. Badali, T.M. Puck
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McCulloh, R.P., and Eversull, L.G.,
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Source Rock Potential of Carbonate
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Salvador, A., 1991b, Triassic-Juras
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Tolson, J.S., C.W. Copeland, and B.
Page 121:
Zimmerman, R.K., 1999a, A potential
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