Updating the Hydrogeologic Framework for the Northern Portion of the Gulf Coast Aquifer Page: III
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Final Report- Updating the Hydrogeologic Framework for the Northern Portion of the Gulf Coast Aquifer
Table of Contents
Executive Sum m ary..................................................................................................................... xiii
1.0 Introduction........................................................................................................................ 1-1
1.1 Approach for Defining Stratigraphy ........................................................................ 1-2
1.2 Approach for Defining Lithology and Generating Sand Maps ................................ 1-3
2.0 Gulf Coast Aquifer Geologic Setting ................................................................................ 2-1
2.1 Overview ................................................................................................................... 2-1
2.2 Structural Features ................................................................................................... 2-4
2.2.1 Faulting and Subsidence.............................................................................. 2-4
2.2.2 Salt Domes in Southeast Texas and Southwest Louisiana ........................... 2-7
2.2.2.1 Salt Dom e Geology..................................................................... 2-8
2.2.2.2 Natural Resources ..................................................................... 2-12
2.2.2.3 Groundwater Chem istry............................................................ 2-16
2.3 Depositional System s............................................................................................. 2-17
2.4 Depositional History .............................................................................................. 2-18
3.0 Stratigraphic and Hydrogeologic Fram ework ................................................................... 3-1
3.1 Previous Studies....................................................................................................... 3-1
3.2 Flem ing Group: Oakville and Lagarto Form ations ................................................ 3-4
3.3 Goliad Form ation..................................................................................................... 3-8
3.4 W illis Form ation.................................................................................................... 3-12
3.5 Lissie Form ation.................................................................................................... 3-13
3.6 Beaum ont Form ation ............................................................................................. 3-13
3.7 Holocene Deposits................................................................................................. 3-14
4.0 Inform ation sources............................................................................................................ 4-1
4.1 Geophysical Logs .................................................................................................... 4-1
4.1.1 Resistivity Logs........................................................................................... 4-2
4.1.2 Spontaneous Potential Logs ........................................................................ 4-3
4.1.3 Am erican Petroleum Institute Form at .......................................................... 4-4
4.2 Approach for Obtaining Geophysical Logs............................................................. 4-5
4.2.1 Geophysical logs' Sources ........................................................................... 4-6
4.2.2 Geophysical Logs Selected for the Study.................................................... 4-6
4.3 Literature Review ................................................................................................ 4-7
4.4 Paleontology Data............................................. 4-8
5.0 Approach for Stratigraphic Interpretation ........................................................................ 5-1
5.1 Chronostratigraphic Conceptual Framework.......................... 5-1
5.2 M ethodology................................................ 5-4
6.0 Gulf Coast Aquifer Stratigraphy ...................................................................................... 6-1
6.1 Chronostratigraphic Surfaces and Aquifer Boundaries .......................................... 6-1
6.2 Structural Configuration of Surfaces ...................................................................... 6-211iii
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Young, Steven C.; Ewing, Tom; Hamlin, Scott; Baker, Ernie & Lupton, Daniel. Updating the Hydrogeologic Framework for the Northern Portion of the Gulf Coast Aquifer, report, June 2012; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth542209/m1/5/?q=%22~1~1~1~1%22~1: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.