Part 4 - Berg - Hughes Center

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following: green, red, and pink conglomeratic lithic arenites and fine- to coarse-grained, feldspathic arenites, interbedded with red and greenish gray shales and siltstones. Lithic arenites contain basalt, chert, quartzite, and dolomite rock fragments; plagioclase is the predominant feldspar. The sandstones have low textural and mineralogic maturities. Eagle Mills red beds and associated intrusive igneous rocks (diabase and basalt dikes and sills) represent the fillings of grabens or rift basins that actively subsided during deposition in alluvial, fluvial-deltaic, and lacustrine paleoenvironments. Middle Jurassic (Werner, Louann) Werner Formation The Werner Formation unconformably overlies both the Eagle Mills and Morehouse Formations and grades into the overlying Louann Salt; north of the limit of the salt, the Werner is overlain unconformably by the Norphlet (Bishop, 1967). Hazzard et al. (1947) mentioned the Werner contains a lower red bed member consisting of red shale and sandstone, commonly conglomeratic at the base, and an upper anhydrite member of relatively pure, dense, granular anhydrite. They reported that the members are conformable, and that the Werner-Louann sequence represents a continuous cycle of deposition. The Werner anhydrite underlies the greater part of south Arkansas and is present in north Louisiana. About 50 ft of red beds and sandstone between the Werner anhydrite and the dark shale of the Morehouse in the A-1 Tensas Delta well is probably the equivalent Werner red bed member. Several workers in the region have reported apparent excessive thickness of Louann Salt as compared to the average 50 to 100 ft of underlying Werner anhydrite (Andrews, 1960). 349
Louann Salt The Louann Salt conformably overlies the Werner anhydrite, and is unconformably overlain by the Upper Jurassic Norphlet (Bishop, 1967). This unconformity of unknown magnitude and the undetermined age of the Eagle Mills make it difficult to determine the exact age of the salt. However, most authors (Murray, 1961; Bishop, 1967) favored an early to middle Jurassic age for the Werner-Louann and gave the following reasons: (1) the evaporite sequence of the Sabinas basin of Mexico, which could be the sulfate concentrate of the Louann Salt, appears to be continuous with beds of the coastal province; (2) the formations underlie strata of known late Jurassic age, and there is no positive evidence for a pre-Mesozoic age; (3) they are stratigraphically equivalent to evaporites and red shale in the Mexican portion of the coastal province which have been determined to be approximately of middle Jurassic age and to overlie, at least in part, Lower Jurassic rocks (Murray, 1961); (4) thick (more than 2,000 ft) salt appears to occur only basinward from the Mexia-Talco, South Arkansas, and Pickens-Gilbertown fault system which also appears to be the approximate updip limit of thick Upper Jurassic sediments; and (5) spores of Mesozoic age have been identified from salt domes of northern Cuba which may be the same age as domes of the United States. Andrews (1960) described undisturbed bedded Louann Salt as being coarsely crystalline, free of terrigenous siliciclastic material, and containing anhydrite streaks. A core taken in the Ohio No. H-1 Waller well (Sec. 3, T. 23 N., R. 8 W) in Claiborne Parish, Louisiana, showed the salt to be white to gray in color. Other salt cores are pale pinkish orange, a color attributed to meteoric water percolating through the Norphlet during deposition. The salt core from this well shows an absence of spores and pollen and 350
Page 1 and 2: time frame spanning from approximat
Page 3: the same well, Pennsylvanian plant
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 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
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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
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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
Page 79 and 80:
Figure 356. Cross section A-A’ sh
Page 81 and 82:
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
Page 95 and 96:
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
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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