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dc.contributor.advisorTatham, R.H. (Robert H.), 1943-
dc.creatorBain, Kevin Alan, 1977-
dc.date.accessioned2016-10-04T14:21:16Z
dc.date.available2016-10-04T14:21:16Z
dc.date.issued2007-05
dc.identifierdoi:10.15781/T2TB0XW94
dc.identifier.urihttp://hdl.handle.net/2152/41439
dc.description.abstractThe sensitivity of transmission and reflection coefficients to varying physical parameters of a hydrocarbon fluid is examined. In particular, earlier work on generalized fluid properties is extended to consider realistic hydrocarbon properties at in-situ conditions. I also expand previous studies of P-P reflectivity, including Biot theory fluid effects, to include P-Sv mode-converted reflections. The goal is to understand how the reflection coefficients change as individual fluid parameters, such as density or viscosity, are varied, which fluid parameters have the greatest affect on the transmission and reflection coefficients, and what actual hydrocarbon and reservoir properties are involved. There is no sensitivity to a fluid or hydrocarbon parameter if the transmission and reflection coefficients do not change as that parameter is varied. The sensitivity analysis is further refined by calculating partial derivates of the reflection coefficients with respect to fluid viscosity. Special attention is given to viscosity because viscosity may act as a proxy for permeability as well as partial gas-saturation in common reservoir sands. To this end I am able to quantitatively describe the degree of gas-saturation and its influence on reflection coefficients. This might provide a technique to lessen the uncertainty encountered in the fizz-gas risk phenomenon. In the gas-oil interfaces, I find that the changes in the P-P reflectivity to be as much as 1.3% for a decrease in oil viscosity corresponding to a change from 1 to 99% gassaturation. In the oil-brine interfaces, the changes in the P-P reflectivity are estimated to be a maximum of 2.6% for a decrease in oil viscosity corresponding to a change from 1 to 99% gas-saturation. Changes in P-SV reflectivity are negligible (<1%) for both models at typical seismic frequencies (~100 Hz).en_US
dc.format.mediumelectronicen_US
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.subjectHydrocarbonsen_US
dc.subjectPorous mediaen_US
dc.subjectSensitivity of transmission and reflectionen_US
dc.titleSensitivity of AVA reflectivity to fluid hydrocarbon properties in porous mediaen_US
dc.typeThesisen_US
dc.description.departmentGeological Sciencesen_US
dc.type.genreThesisen_US
thesis.degree.departmentGeological Sciencesen_US
thesis.degree.disciplineGeological Sciencesen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
dc.rights.restrictionRestricteden_US


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