Part 4 - Berg - Hughes Center

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the high iron content seems to support the existence of the pre-Norphlet unconformity. From subsurface control, it appears as though the salt is laterally continuous and underlies parts of Texas, Arkansas, Alabama, and Mississippi, and nearly all of Louisiana (Andrews, 1960). A maximum thickness of 1,300 ft was recorded in the Placid No. 3 Freeman-Smith (Sec. 14, T. 16 S., R. 13 W.), Calhoun County, Arkansas, and more than 3,300 ft (still in salt at total depth of 14,890 ft) in the C.V.O.C. No. 2 Banks well (Sec. 34, T. 21 N., R. 10 W.), Webster Parish, Louisiana. The thickness is believed to be associated with salt flowage, and may have been the result of basinward thickening of the salt. An original deposition of about 5,000 ft of bedded salt has been postulated but because of the topographically irregular floor of the basin, the thickness was not uniform (Parker and McDowell, 1955; Andrews, 1960). Bishop (1967) reported that precipitation of as much as 5,000 ft of Louann Salt was the result of concentrated marine waters flowing periodically into the basin, more or less isolated from the open sea by barrier bars. The CaCO3 and CaSO4 were precipitated, and the produced concentrated brines of NaCl were deposited in the basin. Upper Jurassic Louark (Norphlet, Smackover, Haynesville-Buckner) Norphlet Formation The Norphlet unconformably overlies the Louann Salt and older units near the margins of the basin where the Louann was not deposited or has been removed by erosion. Based on the relation of the Norphlet to the overlying Smackover, it has been assigned to the Upper Jurassic (Hazzard et al., 1947; Bishop, 1967). The Norphlet of Arkansas, Louisiana, and Texas attains a maximum thickness of about 150 ft and is composed primarily of red and gray shale and sandstone. The northernmost area of 351
Norphlet deposition, in southern Arkansas and northeastern Texas, is characterized by gravel with interbedded red and gray mudstone and is largely fluvial. Basinward, the Norphlet is believed to be composed of lagoonal deposits that are transitional with the lower Smackover; a minor diastem may separate the fluvial equivalents of these rocks from the limestone of the Smackover. Smackover Formation Producing Parishes Bossier, Webster Claiborne, Lincoln, Union The Smackover Formation conformably overlies the Norphlet. It consists mainly of carbonate mud with pyrite and carbonaceous material deposited in a quiet, toxic environment and non-skeletal carbonate grains deposited in a shallow water environment (Hazzard et al., 1947; Bishop, 1968, 1971). It is reported that the deposition of these non-skeletal particles in the late Smackover sea is similar to those of the present Bahama Banks. Likewise, pellet-mud was deposited in warm, quiet, shallow, water followed by slight differential uplift causing turbulence in local areas, and deposition of mixed facies. Dickinson’s (1969) work was used successfully in predicting productive trends, and for reconstructing the environment of deposition of the upper Smackover section (late Jurassic) at North Haynesville field, Claiborne Parish, Louisiana. The oolitic limestone (mudstone, wackestone, packstone) and pelletoid "B" reservoir studied was believed to contain an estimated 16 million barrels of oil in place. Analysis of dry holes in North Haynesville field indicates that nondeposition or complete cementation of the reservoir facies is more important than present structure in limiting the productive area. However, 352
Page 1 and 2: time frame spanning from approximat
Page 3 and 4: the same well, Pennsylvanian plant
Page 5: Louann Salt The Louann Salt conform
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
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
Page 71 and 72:
gas with some oil, not only within
Page 73 and 74:
Figure 350. Burial history profile
Page 75 and 76:
Figure 352. Hydrocarbon expulsion p
Page 77 and 78:
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
Page 85 and 86:
of secondary, non-associated thermo
Page 87 and 88:
RESULTS AND DISCUSSION Geologic His
Page 89 and 90:
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
Page 101 and 102:
The Upper Jurassic to Lower Cretace
Page 103 and 104:
Bishop, W.F., 1968, Petrology of up
Page 105 and 106:
Dawson, W.C., and Callender, C.A.,
Page 107 and 108:
Fisher, W.L., and McGowen, J.H., 19
Page 109 and 110:
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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