Part 4 - Berg - Hughes Center

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Paleozoic (Pennsylvanian-Permian) The oldest sediments drilled in the subsurface of north Louisiana are in the late Pennsylvanian-Permian (310-250 mya) carbonate section over a Sabine Terrane (Lowrie et al., 1993). An example is found in a crestal area located in Sabine Parish, Louisiana (Zimmerman, 2000). In southern Arkansas and extending southward to the north side of the North Louisiana Salt Basin, folded Pennsylvanian-Mississippian sandstone and shale of the Ouachita are present. Imlay (1942) considered the Morehouse Formation as representing this unit of rocks in the deeper parts of the basin. Morehouse Formation One of the older sedimentary rocks drilled to date in the subsurface of north Louisiana is the gray shale with rare siltstone and limestone of the Morehouse Formation. It is found from 9,285 to 10,475 ft in depth in the Union Producing well (No. A-1 Tensas Delta), drilled in Morehouse Parish (Sec. 8, T. 22 N., R. 4 E) (Imlay, 1942; Bishop, 1967). Because this well was still in the Morehouse Formation at total depth and no other wells have penetrated it, the exact thickness of the formation is unknown. This well also indicated that the Morehouse is overlain directly by Werner red beds (Hazzard et al., 1947; Scott et al., 1961). According to these authors the Morehouse was deposited prior to the Eagle Mills, and later removed in south Arkansas by pre-Werner erosion. Other geologists define the Morehouse either as a marine wedge overlying the Eagle Mills or as a downdip marine facies of that formation. According to Imlay (1942), a distinctive gastropod and assemblage of other pelecypods found in cores from the No. A-1 Tensas Delta well suggest a late Paleozoic age, probably not older than Pennsylvanian, for the Morehouse Formation. In a core from 347
the same well, Pennsylvanian plant spores were recovered, which allowed Imlay (1942) to assign a middle to late Pennsylvanian age to the formation. Late Triassic-Early Jurassic (Eagle Mills) Eagle Mills Formation The Eagle Mills Formation (Fig. 315) extends in the subsurface from east Texas through south Arkansas into Alabama. However, it has not been penetrated by the drill in north Louisiana, and is absent in the Union No. A-1 Tensas Delta well (Bishop, 1967). Some early papers report the Eagle Mills to be Permian in age similar to the Morehouse and that the two formations were deposited on opposite sides of a buried ridge along the Arkansas-Louisiana line (Chapman, 1963). According to Scott et al. (1961), the Eagle Mills unconformably overlies beds of Paleozoic age and is overlapped unconformably on the north by the Jurassic Werner. These authors were unable to establish the northern depositional limit in south Arkansas, and reported that the eroded edge has been fairly well defined in the subsurface where, the Eagle Mills was found to be approximately 7,000 ft thick in the Humble No. 1 Royston well in Hempstead County, Arkansas. Based on cores from this well, Scott et al. (1961) suggested a late Triassic age for the Eagle Mills. These authors observed plant fossils, including Macrotaeniopteris magnifolia, and reported that the fossils are closely comparable with those of known late Triassic rocks, particularly the Newark Group of the eastern seaboard and the Chinle Formation of Arizona. More recent work by Dawson and Callendar (1991) and based on information from several deep wells (12,000-18,000 ft) in northeast Texas and southwest Arkansas, the Eagle Mills is considered to be of Triassic-Jurassic age. The lithology given is the 348
Page 1: time frame spanning from approximat
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 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
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Table 6. Cotton Valley-Group sample
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Table 7. Wells used to construct th
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Figure 336. Electric logs for wells
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Figure 338. Thin section micrograph
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Figure 340. Amoco CZ 5-7 well elect
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Table 9. Total organic carbon, rock
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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.,
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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Part 4 - Berg - Hughes Center

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