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Chemostratigraphy of the Upper Jurassic (Oxfordian) Smackover Formation for Little Cedar Creek and Brooklyn Fields, Alabama

1
Department of Geology & Geological Engineering, The University of Mississippi, 120A Carrier Hall, University, MS 38677, USA
2
Naval Oceanographic Office, Naval Meteorology and Oceanography Command, Stennis Space Center, 1100 Balch Blvd, Hancock County, MS 39529, USA
3
Mississippi Mineral Resource Institute, The University of Mississippi, 111 Brevard Hall, University, MS 38677, USA
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(6), 269; https://doi.org/10.3390/geosciences9060269
Received: 2 June 2019 / Revised: 14 June 2019 / Accepted: 17 June 2019 / Published: 20 June 2019
(This article belongs to the Section Geochemistry)
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Abstract

The Upper Jurassic (Oxfordian Age) Smackover Formation is a significant source for hydrocarbon production in southwest Alabama. Brooklyn Field is in southeast Conecuh County, Alabama, and has been a major producer of oil and natural gas for the state. The Smackover is a carbonate formation that has been divided into seven distinct lithofacies in the Brooklyn and Little Cedar Creek fields. In southwest Alabama, the facies distribution in the Smackover Formation was influenced by paleotopography of the underlying Paleozoic rocks of the Appalachian system. The goal of this study is to determine elemental ratios in rock core within the Smackover Formation using an X-ray fluorescence (XRF) handheld scanner and to correlate these elemental characteristics to the lithofacies of the Smackover Formation in the Brooklyn and Little Cedar Creek fields. Eight wells were used for the study within Brooklyn Field and Little Cedar Creek fields. Cores from the eight wells were scanned at six-inch intervals. Chemical logs were produced to show elemental weights in relation to depth and lithofacies. The chemical signatures within producing zones were correlated to reservoir lithofacies and porosity. Aluminum, silicon, calcium, titanium, and iron were the most significant (>95% confidence level) predictors of porosity and may be related to the depositional environment and subsequent diageneses of the producing facies. The XRF data suggests relative enrichments in iron, titanium, and potassium. These elements may be related to deposition in relatively restricted marine waters. View Full-Text
Keywords: X-ray fluorescence; paleo-depositional environments; porosity X-ray fluorescence; paleo-depositional environments; porosity
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Yarbrough, L.D.; Engle, R.A.; Easson, G. Chemostratigraphy of the Upper Jurassic (Oxfordian) Smackover Formation for Little Cedar Creek and Brooklyn Fields, Alabama. Geosciences 2019, 9, 269.

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