Construction of deep-water deposits by subaqueous-transitional flows

dc.contributor.advisorMohrig, David
dc.contributor.committeeMemberSteel, Ronald J
dc.contributor.committeeMemberKim, Wonsuck
dc.contributor.committeeMemberCovault, Jacob A
dc.contributor.committeeMemberSylvester, Zoltan
dc.creatorKoo, Woong Mo 2018
dc.description.abstractUnderstanding the transitional-sediment-gravity flow is essential to predicting the quality of hydrocarbon reservoirs because the transitional flow is an important carrier of muddy sands into deep water. I studied the deposition and reworking processes in transitional flows, and I investigated how these sedimentary processes produce divergent stratigraphy patterns of deep-water deposits. Physical experiments were conducted in a three-dimensional tank for observing transitional flows and their deposits directly under the known boundary conditions. The experiment data from the series of single-event flows demonstrated that two types of remobilizations occur in single-event transitional flows. In the early stage of a flow, the autogenic remobilization occurs via sliding on a muddy layer lubricated by a dewatering basal sand layer. In the late stage, a flow overrunning the initial deposit without lubricating layers drags the underlying deposit. These remobilizations in a single transitional flow produce the basal sand and capping mud couplets that are similar to interpreted turbidite-debrite-like couplets in nature systems. The data also demonstrates that the sediment concentrations explain the overall simplicity of lobate deposits (i.e., geometries of deposits), but the autogenic remobilizations in a single flow increase the complexity of deposits (i.e., morphology and lithofacies of deposits). The data from sequentially generated two transitional flows presented the spatial stacking pattern of deposits. The acoustic data and cores demonstrates that the rheology of a flow changes as a result of interaction with substrates. The rheology change results in the hybrid-stepping of litholofacies boundaries in deposits. The hybrid-stepping is characterized by an advancing deposit margin and a retreating sand margin of a bed when compared with those of older beds. Conceptual models for the stacking of transitional flow deposits demonstrate that identical transitional flows can develop divergent stratigraphies depending on the consolidation of muddy substrates
dc.description.departmentEarth and Planetary Sciences
dc.subjectSubaqueous-transitional flow
dc.subjectPhysical modeling
dc.subjectTransitional-flow deposit
dc.subjectGeometry of lobate deposit
dc.subjectFlow-substrate interaction
dc.subjectStacking patterns of lobate deposit
dc.titleConstruction of deep-water deposits by subaqueous-transitional flows
dc.type.materialtext Sciences Sciences University of Texas at Austin of Philosophy

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