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Biostratigraphic and Geochemical Constraints on the Stratigraphy and Depositional Environments of the Eagle Ford and Woodbine Groups of Texas

By
Richard A. Denne
Richard A. Denne
Marathon Oil Company, 5555 San Felipe, Houston, Texas 77056, U.S.A. (e-mails: richdenne@att.net; jabreyer@marathonoil.com; t.kosanke@crazykfarm.com; jspaw@marathonoil.com)
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John A. Breyer
John A. Breyer
Marathon Oil Company, 5555 San Felipe, Houston, Texas 77056, U.S.A. (e-mails: richdenne@att.net; jabreyer@marathonoil.com; t.kosanke@crazykfarm.com; jspaw@marathonoil.com)
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Tobi H. Kosanke
Tobi H. Kosanke
Marathon Oil Company, 5555 San Felipe, Houston, Texas 77056, U.S.A. (e-mails: richdenne@att.net; jabreyer@marathonoil.com; t.kosanke@crazykfarm.com; jspaw@marathonoil.com)
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Joan M. Spaw
Joan M. Spaw
Marathon Oil Company, 5555 San Felipe, Houston, Texas 77056, U.S.A. (e-mails: richdenne@att.net; jabreyer@marathonoil.com; t.kosanke@crazykfarm.com; jspaw@marathonoil.com)
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Arden D. Callender
Arden D. Callender
ALS Ellington and Associates, 1414 Lumpkin Rd., Houston, Texas 77043, U.S.A. (e-mails: callenderardy@sbcglobal.net; rhinote@comcast.net; mohsen.kariminia@alsglobal.com; forams.tur@gmail.com)
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Russell E. Hinote
Russell E. Hinote
ALS Ellington and Associates, 1414 Lumpkin Rd., Houston, Texas 77043, U.S.A. (e-mails: callenderardy@sbcglobal.net; rhinote@comcast.net; mohsen.kariminia@alsglobal.com; forams.tur@gmail.com)
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Mohsen Kariminia
Mohsen Kariminia
ALS Ellington and Associates, 1414 Lumpkin Rd., Houston, Texas 77043, U.S.A. (e-mails: callenderardy@sbcglobal.net; rhinote@comcast.net; mohsen.kariminia@alsglobal.com; forams.tur@gmail.com)
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Nataliya Tur
Nataliya Tur
ALS Ellington and Associates, 1414 Lumpkin Rd., Houston, Texas 77043, U.S.A. (e-mails: callenderardy@sbcglobal.net; rhinote@comcast.net; mohsen.kariminia@alsglobal.com; forams.tur@gmail.com)
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Zachary Kita
Zachary Kita
Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, 1400 R St., Lincoln, Nebraska 68588, U.S.A. (e-mail: zachary.kita@gmail.com)
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Jackie A. Lees
Jackie A. Lees
Department of Earth Sciences, University College London, Gower St., London WC1E 6BT, U.K. (e-mail: j.lees@ucl.ac.uk)
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Harry Rowe
Harry Rowe
Bureau of Economic Geology, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, 10100 Burnet Rd., Bldg. 130, Austin, Texas 78713, U.S.A. (e-mail: harry.rowe@beg.utexas.edu)
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Published:
January 01, 2016

Abstract

The 130-year history of study of the Cenomanian–Turonian Eagle Ford and Woodbine Groups of Texas has created a complicated and often confusing nomenclature system. Deciphering these nomenclatures has frequently been hindered by outdated biostratigraphic studies with inaccurate age interpretations. To resolve these issues, a comprehensive compilation and vetting of available biostratigraphic, geochemical, and lithologic data from Eagle Ford and Woodbine outcrops and subsurface penetrations was undertaken, which was then tied to a large network of wells in both south and east Texas. Composite sections were built for four outcrop areas of central and north Texas (Dallas, Red River, Waco, Austin), five outcrop areas from west Texas (Langtry, Del Rio, Big Bend, Chispa Summit, Quitman Mountains), four subsurface areas from south Texas (Webb County, Atascosa County, Karnes County, DeWitt/Gonzales Counties), and two cross sections from the east Texas subsurface (basin center and eastern margin). The resulting datasets were utilized to construct age models and characterize depositional environments, including paleoceanography. In agreement with previous studies, the total organic carbon (TOC)-rich Lower Eagle Ford was interpreted to have been deposited under anoxic to euxinic conditions and the Upper Eagle Ford under dysoxic to anoxic conditions. The Oceanic Anoxic Event 2 (OAE2) interval is missing at all locations north of Atascosa County; when present it is characterized as having been deposited under oxic to suboxic conditions. High abundances of radiolaria and calcispheres identified within recrystallized medial to distal limestones of the Lower Eagle Ford indicated limestone formation during periods of enhanced water-column mixing and increased primary productivity, in contrast to proximal limestones composed of planktonic foraminifera and inoceramid prisms concentrated by bottom currents.

Standardized nomenclature systems and age models are proposed for each of the outcrop and subsurface areas. Proposed changes to existing nomenclatures include reassignment of the Tarrant Formation of the Eagle Ford to the Lewisville Formation of the Woodbine in the Dallas area and the Templeton Member of the Lewisville Formation to the Britton Formation of the Eagle Ford in the Red River area. The proposed term “Waller Member” of Fairbanks (2012) for the former Cloice Member of the Lake Waco Formation in the Austin area is recognized with a new stratotype proposed and described, although the Waller Member is transferred to the Pepper Shale Formation of the Woodbine. The Terrell Member is proposed for the carbonate-rich section at the base of the Boquillas Formation in the Langtry and Del Rio areas, restricting the Lozier Canyon Member to the organic-rich rocks underlying the Antonio Creek Member. The south Texas subsurface is divided into the Upper Eagle Ford and Lower Eagle Ford Formations, with the clay-rich Maness Shale Member at the base of the Lower Eagle Ford and the foraminifera grainstone dominated Langtry Member at the top of the Upper Eagle Ford. Use of the term “middle Eagle Ford” for the clay-rich facies south of the San Marcos arch is not recommended.

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Figures & Tables

Contents

AAPG Memoir

The Eagle Ford Shale: A Renaissance in U.S. Oil Production

John Breyer
John Breyer
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American Association of Petroleum Geologists
Volume
110
ISBN electronic:
9781629812748
Publication date:
January 01, 2016

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