@article{spooner1964basal,
    author = "Spooner, Harry V.",
    title = "Basal Tuscaloosa Sediments, East-Central Louisiana",
    year = "1964",
    journal = "AAPG Bulletin",
    abstract = "The rocks of the Tuscaloosa Group, basal Upper Cretaceous unit in the eastern Gulf Coastal Province, record a complete depositional cycle. The lower Tuscaloosa comprises the transgressive stage, the middle Tuscaloosa the inundated phase, and the upper Tuscaloosa the regressive. Many stratigraphically controlled hydrocarbon traps are present in the basal part of the transgressive lower Tuscaloosa unit in east-central Louisiana. Southeastern Tensas Parish was chosen as a type area in which to analyze the lower Tuscaloosa in detail. The study of the type area revealed that although numerous lower Tuscaloosa sands produce hydrocarbons, only one, herein termed Buckhorn sand, contains significant reserves. It is concluded that this sand was deposited in depressions on the pre-Tuscaloosa erosion surface. Stratigraphic cross sections, a lower Tuscaloosa isopach map, a structure map of the pre-Tuscaloosa unconformity, and a pre-Tuscaloosa paleogeologic map can be collectively used to form interpretations of pre-Tuscaloosa topography and related Buckhorn sand distribution patterns. The interpreted sand patterns can then be presented in the form of a Buckhorn sand isopach map. If this map is considered in conjunction with a top of the lower Tuscaloosa structure map, potential hydrocarbon traps can be found. Since basal Tuscaloosa depositional patterns are similar throughout east-central Louisiana, the methods used in the type area are applicable to the entire area.",
    url = "https://doi.org/10.1306/bc743bbf-16be-11d7-8645000102c1865d",
    doi = "10.1306/bc743bbf-16be-11d7-8645000102c1865d",
    number = "1",
    pages = "1-21",
    volume = "48"
}

@article{christina1979the1,
    author = "Christina, C. C. and Martin, K. G",
    title = "The Lower Tuscaloosa trend of south- central Louisiana",
    year = "1979",
    journal = {You ain't seen nothing till you've seen the Tuscaloosa": Gulf Coast Association of Geological Societies Transactions, v. 29, p. 37-41},
    note = {talkorigins\_source = {true}; raw\_reference = {Christina, C. C., and Martin, K. G., 1979, The Lower Tuscaloosa trend of south- central Louisiana: "You ain't seen nothing till you've seen the Tuscaloosa": Gulf Coast Association of Geological Societies Transactions, v. 29, p. 37-41.}}
}

@article{joebadams1980no,
    author = "Joe B. Adams, Frank W. Harrison, Jr",
    title = "No. 1 Play in U.S.A.--South Louisiana Tuscaloosa Trend, 1975-80: ABSTRACT",
    year = "1980",
    journal = "AAPG Bulletin",
    url = "https://doi.org/10.1306/2f9195c1-16ce-11d7-8645000102c1865d",
    doi = "10.1306/2f9195c1-16ce-11d7-8645000102c1865d",
    volume = "64"
}

@article{lwfunkhouser1980deep,
    author = "L. W. Funkhouser, F. X. Bland, C. C",
    title = "Deep Tuscaloosa Gas Trend of South Louisiana: ABSTRACT",
    year = "1980",
    journal = "AAPG Bulletin",
    url = "https://doi.org/10.1306/2f918d6a-16ce-11d7-8645000102c1865d",
    doi = "10.1306/2f918d6a-16ce-11d7-8645000102c1865d",
    volume = "64"
}

@article{stevenson1980log,
    author = "Stevenson, John",
    title = "Log Evaluation of Wells in Tuscaloosa Trend of South Louisiana: ABSTRACT",
    year = "1980",
    journal = "AAPG Bulletin",
    url = "https://doi.org/10.1306/2f9196ac-16ce-11d7-8645000102c1865d",
    doi = "10.1306/2f9196ac-16ce-11d7-8645000102c1865d",
    volume = "64"
}

@article{lwfunkhouser1981deep,
    author = "L. W. Funkhouser, F. X. Bland, C. C",
    title = "Deep Tuscaloosa Gas Trend of South Louisiana: ABSTRACT",
    year = "1981",
    journal = "AAPG Bulletin",
    url = "https://doi.org/10.1306/03b599db-16d1-11d7-8645000102c1865d",
    doi = "10.1306/03b599db-16d1-11d7-8645000102c1865d",
    volume = "65"
}

@article{alan1982preservation,
    author = "Alan, Thomson",
    title = "Preservation of Porosity in the Deep Woodbine/Tuscaloosa Trend, Louisiana",
    year = "1982",
    journal = "Journal of Petroleum Technology",
    abstract = "Summary Cores of the Woodbine/Tuscaloosa formation from False River field, Pointe Coupee Parish, LA. contain sandstones from 20,000 ft (6562 m) with anomalously high porosities and permeabilities. Porosities greater than 25\% and permeabilities of hundreds of millidarcies are common. Scanning electron microscopy (SEM) shows that individual grains of these olive-green semifriable sandstones are coated with chlorite. The chlorite occurs as 7 to 10 micron- (µm-) wide hexagonal plates that arrange themselves edgewise one crystal thick on grain surfaces. Sandstones with continuous chlorite coatings around quartz grains display little framework compaction and minor development of secondary quartz overgrowths; however, interbedded sandstones with little or no chlorite often are cemented completely by secondary quartz. Intermediate between these extremes are sandstones with incomplete or poorly developed chlorite coatings; these display outgrowths of secondary quartz rather than overgrowths of an envelope nature. Petrographic and SEM data indicate an early diagenetic origin for the chlorite, which apparently ceased to form once detrital grains were coated with a single layer of crystals. This layer was sufficient to mask nucleation sites for silica overgrowths, and in addition may have prevented compaction by pressure solution, thereby allowing the sandstones to be buried to great depths without appreciably reducing porosity. A late dissolution event resulted in the formation of some secondary porosity, but the bulk of the observed porosity is relict primary in origin, formed in the manner previously described. Reservoir engineers and petrophysicists might ask themselves what effects the micropore system produced by the chlorite coatings will have on irreducible and critical water saturations as well as porosity logs. Introduction In mid-1965, Chevron Oil Co. discovered a deep gas accumulation in Pointe Coupee Parish, LA, in what is now called False River field. The field is 12 miles (20.81 km) downdip of the Lower Cretaceous Edwards shelf margin (Fig. 1) and production is from Woodbine/Tuscaloosa sandstones at about 20,000 ft (6462 m). A core of a water-bearing sandstone was taken from below 21,000 ft (6890 m) in the discovery well, Alma Plantation Well 1, with reported measured porosity values up to 26\% (unstressed) and permeability values as much as 200 md. With this well the deep Woodbine/Tuscaloosa play was born. That these porosity values are anomalously high is illustrated in Fig. 2, which plots porosity vs. depth for an average reservoir sandstone. The high porosity values for the Alma Plantation Well 1 depart markedly from the normal trend. This observation prompted our study. Chlorite in a Deeply-Buried Sandstone Petrography Selected portions of the deep sandstone core in the Alma Plantation Well 1 are shown in Fig. 3, along with petrophysical data. Intervals with high porosity were recovered as crumbly fragments and are semifriable. The sandstones are fine grained and well sorted. The only important internal sedimentary structure is a faint graded bedding. A few marine shells are present, but adjacent shales are barren of fossils. Core samples from the nearby Crochet Well 1 also were examined. These samples ranged from crumbly and semi friable to hard and almost quartaitic. Core analyses of selected intervals from the two wells are shown in Tables 1 and 2. Petrography Selected portions of the deep sandstone core in the Alma Plantation Well 1 are shown in Fig. 3, along with petrophysical data. Intervals with high porosity were recovered as crumbly fragments and are semifriable. The sandstones are fine grained and well sorted. The only important internal sedimentary structure is a faint graded bedding. A few marine shells are present, but adjacent shales are barren of fossils. Core samples from the nearby Crochet Well 1 also were examined. These samples ranged from crumbly and semi friable to hard and almost quartaitic. Core analyses of selected intervals from the two wells are shown in Tables 1 and 2.",
    url = "https://doi.org/10.2118/10137-pa",
    doi = "10.2118/10137-pa",
    number = "05",
    pages = "1156-1162",
    volume = "34"
}

@article{richardpmcculloh1983hydropressure,
    author = "Richard P. McCulloh, Mark D. Purcel",
    title = "Hydropressure Tongues Within Regionally Geopressured Lower Tuscaloosa Sandstone, Tuscaloosa Trend, Louisiana: ABSTRACT",
    year = "1983",
    journal = "AAPG Bulletin",
    url = "https://doi.org/10.1306/ad460774-16f7-11d7-8645000102c1865d",
    doi = "10.1306/ad460774-16f7-11d7-8645000102c1865d",
    volume = "67"
}

@article{mcculloh1985fluidflow,
    author = "McCulloh, Richard P.",
    title = "Fluid-Flow Patterns in Central Tuscaloosa Trend, Louisiana: ABSTRACT",
    year = "1985",
    journal = "AAPG Bulletin",
    url = "https://doi.org/10.1306/ad462d71-16f7-11d7-8645000102c1865d",
    doi = "10.1306/ad462d71-16f7-11d7-8645000102c1865d",
    volume = "69"
}

@article{smith1985decade,
    author = "Smith, Guy W.",
    title = "Decade of Exploration in Deep Lower Tuscaloosa Gas Trend in Southern Louisiana: ABSTRACT",
    year = "1985",
    journal = "AAPG Bulletin",
    abstract = "The deep lower Tuscaloosa gas trend, now in a mature stage of exploration, was discovered in 1975. Production is from lower Tuscaloosa sandstones of Late Cretaceous age. During the past decade, the petroleum industry has drilled approximately 217 new-field wildcats and 232 development wells in the trend. This exploration effort has discovered 24 fields. Most of these fields produce from depths between 15,000 and 20,000 ft. In February 1984, the average daily production was 426.6 mmcf of gas and 18,350 bbl of liquid hydrocarbons from approximately 115 wells. Five fields, False River, Irene, Judge Digby, Moore-Sams, and Port Hudson, all discovered prior to 1980 and concentrated northwest of Baton Rouge, Louisiana, have produced about 72\% of the cumulative gas and 80\% of the cumulative liquids. Reservoirs in deep lower Tuscaloosa occur in a terrigenous clastic sequence, which thickens rapidly downdip from a carbonate shelf of Early Cretaceous age. Occurrences of commercial hydrocarbons in the trend are primarily dependent on depositional environment, syndepositional tectonics, source rock, original sand mineralogy, and burial diagenesis. Salt diapirism is locally important.",
    url = "https://doi.org/10.1306/ad4623d0-16f7-11d7-8645000102c1865d",
    doi = "10.1306/ad4623d0-16f7-11d7-8645000102c1865d",
    number = "2",
    pages = "308-308",
    volume = "69"
}

@incollection{weedman1994deep,
    author = "Weedman, Suzanne D. and Guber, Albert L. and Engelder, Terry",
    title = "Deep Pressure in the Lower Tuscaloosa Formation, Louisiana Gulf Coast",
    year = "1994",
    booktitle = "Basin Compartments and Seals",
    url = "https://doi.org/10.1306/m61588c6",
    doi = "10.1306/m61588c6"
}