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dc.contributor.advisorSarg, J. F. (J. Frederick)
dc.contributor.authorAl Ibrahim, Mustafa Ali H
dc.date.accessioned2007-01-03T05:27:31Z
dc.date.accessioned2022-02-09T08:57:35Z
dc.date.available2007-01-03T05:27:31Z
dc.date.available2022-02-09T08:57:35Z
dc.date.issued2014
dc.date.submitted2014
dc.identifierT 7663
dc.identifier.urihttps://hdl.handle.net/11124/17017
dc.description2014 Fall.
dc.descriptionIncludes illustrations (some color), maps (some color).
dc.descriptionIncludes bibliographical references.
dc.description.abstractCarbonate mudrocks are heterogeneous at different scales. Linking the large-scale heterogeneity (e.g., sedimentary structure, and rock types) to the small-scale variations (e.g., micrite textures, pore types, and organic content) is essential for hydrocarbon exploration. This study examines a basinal interval of the Tuwaiq Mountain and Hanifa formations, Saudi Arabia, in an attempt to establish this linkage. Five lithofacies have been identified from core and thin sections. At this location, the Tuwaiq Mountain Formation is composed of shelf-derived wackestones to grainstones, and is dominated by a highstand systems tract. The Hanifa Formation is composed mainly of laminated mudstones and wackestones, capped by a sequence boundary and a lowstand systems tract composed of packstones and anhydrite. Multi-scale automated electrofacies analysis using self-organizing maps and hierarchical clustering shows good correlation with lithological variations observed and the sequence stratigraphic interpretation. Elemental analysis allows for the creation of redox and paleoproductivity indices. High total organic carbon content occurs in transgressive system tracts and correlates well with intervals with suboxic to anoxic conditions and relatively high paleoproductivity. Cyclostratigraphic analysis done with borehole images using the Modified Fischer Plot approach shows distinct thinning and thickening stacking patterns. These are correlatable with independently defined sequence stratigraphic surfaces. Spectral analysis shows viable correlation with Milankovitch cycles. High-resolution scanning electron and confocal microscope images show different micrite textures ranging from porous subrounded to tightly fused micrite. Variations in texture are mainly attributed to sediment composition. Shelf-derived sediments are dominant in the highstand systems tract and are metastable, resulting in recrystallization and tight micrite formation. Transgressive systems tracts contain a relatively higher proportion of coccoliths. These are relatively more stable, so a porous texture is observed due to lack of recrystallization. Coccoliths can also bind with organic matter, which results in an increase in settling velocity, leading to enhanced preservation of organic matter. Depositional processes related to the sequence stratigraphic framework are interpreted to control microscale variations in terms of micrite texture, porosity, and total organic content.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2010-2019 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.subjectmicrite
dc.subjectFischer plots
dc.subjectcarbonate
dc.subjectmudrocks
dc.subjectSaudi Arabia
dc.subjectunconventional
dc.subject.lcshLithofacies -- Saudi Arabia
dc.subject.lcshFormations (Geology) -- Saudi Arabia
dc.subject.lcshCarbonate rocks -- Saudi Arabia
dc.subject.lcshRocks -- Permeability -- Saudi Arabia
dc.subject.lcshSequence stratigraphy
dc.subject.lcshGeochemistry -- Saudi Arabia
dc.subject.lcshHydrocarbons -- Saudi Arabia
dc.titleMulti-scale sequence stratigraphy, cyclostratigraphy, and depositional environment of carbonate mudrocks in the Tuwaiq Mountain and Hanifa formations, Saudi Arabia
dc.typeText
dc.contributor.committeememberHumphrey, John D.
dc.contributor.committeememberHurley, Neil F.
dc.contributor.committeememberCantrell, Dave
thesis.degree.nameMaster of Science (M.S.)
thesis.degree.levelMasters
thesis.degree.disciplineGeology and Geological Engineering
thesis.degree.grantorColorado School of Mines


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