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dc.contributor.advisorTice, Michael M
dc.creatorKruse, Kendra
dc.date.accessioned2015-04-28T15:21:35Z
dc.date.available2015-04-28T15:21:35Z
dc.date.created2014-12
dc.date.issued2014-08-27
dc.date.submittedDecember 2014
dc.identifier.urihttp://hdl.handle.net/1969.1/153852
dc.description.abstractCarbonate precipitation can be either promoted or inhibited by microbial processes in different redox zones. It is therefore possible for basin redox evolution to indirectly control early carbonate diagenesis and modify reservoir properties of corresponding shale units. The goals of this study were to analyze geochemical characteristics of the Late Cretaceous Eagle Ford Group in McMullen County, Texas to test the hypotheses that (1) the redox state of the water column controlled carbonate cement abundance and (2) carbonate cement lowered organic matter content by volumetric dilution. An x-ray analytical microscope was used to map elemental compositions of fresh core samples within the Eagle Ford Group. Resultant maps were used to characterize carbonate cements and to estimate the redox state of the overlying water column during deposition, as indicated by the relative abundances of the trace metals Mo, V, and Cr. Results indicate that cementation occurred early relative to compaction. Ti Kal normalized Mo Kal and CaKal fluorescence intensities are positively correlated throughout the unit, suggesting that carbonate cementation was related to the redox state. Total organic carbon is negatively correlated in the upper Lower Eagle Ford with (Ca Kal)/(Ti Kal) fluorescence ratio, consistent with volumetric dilution of organic matter by diagenetic cementation prior to compaction. In contrast, there is no significant correlation between total organic carbon and carbonate content in the more organic-rich Lower Eagle Ford.en
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.subjectGeochemistryen
dc.subjectchemostratigraphyen
dc.subjectXRFen
dc.subjectEagle Forden
dc.subjectwater column chemistryen
dc.subjectpetroleumen
dc.subjectdiagenesis, carbonate precipitationen
dc.subjectcarbonate cementationen
dc.subjectcarbonateen
dc.subjectshaleen
dc.subjectorganicsen
dc.subjectredoxen
dc.subjectmicrobial respirationen
dc.titlePaleoenvrironmental Controls on Diagenesis of Organich-Rich Shales in the Eagle Ford Groupen
dc.typeThesisen
thesis.degree.departmentGeology and Geophysicsen
thesis.degree.disciplineGeologyen
thesis.degree.grantorTexas A & M Universityen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelMastersen
dc.contributor.committeeMemberPope, Michael C
dc.contributor.committeeMemberAyers, Walter B
dc.type.materialtexten
dc.date.updated2015-04-28T15:21:35Z
local.etdauthor.orcid0000-0002-5843-304X


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