Stratigraphic analysis of reflectivity data, application to gas reservoirs in the Burgos Basin, Mexico

dc.contributor.advisorFisher, William L.en
dc.contributor.advisorHardage, Bob A.en
dc.creatorBarrios Rivera, Jorgeen
dc.date.accessioned2008-08-28T21:22:37Zen
dc.date.available2008-08-28T21:22:37Zen
dc.date.issued2003en
dc.descriptiontexten
dc.description.abstractReflectivity data derived from the inversion of post-stack seismic data can be used to improve the detection and spatial delineation of stratigraphic sequences. The enhancement in spatial resolution inherent to post-stack inversion can often substantially improve standard delineation results based on seismic amplitudes. In this research, a study is described of the use of reflectivity data to delineate stratigraphic sequences associated with gas-producing sands in a mature basin. Stratigraphic units in the Burgos Basin consist of Oligocene, wavedominated deltaic sequences within delta front and prodelta facies. Post-stack reflectivity data helped to define the lateral continuity of coast-parallel sand bodies deposited by wave action and reworking of sediments supplied by the ancient Rio Grande. An attempt was made to discriminate high-porosity, clean sands from shaly sands within a given sand unit. This was done using reflectivity data derived from pre-stack inversion. Extensive petrophysical analysis confirmed that prestack inversion could provide a quantitative method that discriminates highquality from low-quality sands. In particularly favorable situations, pre-stack inversion results could even help to discriminate between water and gas. Pre-stack inversion yielded angle-dependent reflectivities as well as density, P-wave and Swave velocities. Transformations of these properties into Lamé’s lambda*rho and mu*rho parameters were also explored to assess the influence of shale volume, total porosity, and rock type within sand and shale units delineated by post-stack inversion. Spatial delineation of sand units is presented near two key exploration wells. Success in the location of development wells is significantly constrained by the spatial delineation of reservoir units.
dc.description.departmentEarth and Planetary Sciencesen
dc.format.mediumelectronicen
dc.identifierb56717301en
dc.identifier.oclc55964888en
dc.identifier.urihttp://hdl.handle.net/2152/447en
dc.language.isoengen
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
dc.subject.lcshGas reservoirs--Mexico--Burgos Basinen
dc.subject.lcshGeology, Stratigraphicen
dc.titleStratigraphic analysis of reflectivity data, application to gas reservoirs in the Burgos Basin, Mexicoen
dc.type.genreThesisen
thesis.degree.departmentGeological Sciencesen
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen
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