Dissertation/Thesis Abstract

Facies and Log Analysis of the Tuscaloosa Marine Shale
by Weitkunat, Sydney, M.S., University of Louisiana at Lafayette, 2015, 79; 1596664
Abstract (Summary)

The purpose of this study is to delineate lithological fairways through which hydraulic fracturing could produce optimal flow results, and to point towards repeatable data that reflect these optimal lithologies. Consideration of unconventional petroleum system characteristics and the evaluation of the lithofacies, parasequences, and geomechanical rock properties were required to reach this goal. Equally of interest was whether these rock properties presented a logical map pattern and whether connections could be made throughout the sequences. This study included core descriptions of 9 conventional cores, along with analysis of samples for geochemical and petrophysical data. Well log evaluation across the play included a sequence stratigraphic evaluation to tie the rock to the log, and reveal continuities. The results showed a distinction of the TMS-East versus TMS-West by a drastic difference in lithology, where TMS-East is dark, laminated mudstone that is rich in organic matter, TMS-West is primarily mottled, calcareous mudstone. Brittleness index increased from .3 in the East to as high as .65 in the West. Total Organic Carbon was found to be higher in the East, with an average maximum of 2.2%, while Western sediments had an average maximum of 1.2%. Eastern samples showed more range of kerogen types, from Type III to Type II/III, while the Western TMS samples showed less variety and a median range of Type III or gas prone kerogen. Incorporating stratigraphic sequence analysis, as many as 16 parasequences were found within the TMS-West and 8 were seen in the TMS-East. These parasequences, topped by flooding surfaces, appear to be locally correlative, and only major flooding surfaces, regionally. Comparison of vertical and horizontal, lithological, and geochemical characteristics revealed that within the TMS-East, where the TOC, Maturation, geochemical, and mechanical properties yield the most prolific combination lies approximately 30–40 feet above the base of the TMS.

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Indexing (document details)
Advisor: Lock, Brian
Commitee: Borrok, David, Richter, Carl
School: University of Louisiana at Lafayette
Department: Geology
School Location: United States -- Louisiana
Source: MAI 55/01M(E), Masters Abstracts International
Subjects: Geology, Sedimentary Geology, Petroleum engineering, Geochemistry
Keywords: Facies, Lithofacies, Mineralogy, Parasequence, Shale, Tuscaloosa marine shale
Publication Number: 1596664
ISBN: 9781321984897
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