Enhancement of temporal and spatial resolution of 2-D reflection data: application to Texaco data over Venice Dome in Plaquemines Parish, Louisiana

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dc.contributor.authorMinnich, Sara Louiseen
dc.contributor.departmentGeophysicsen
dc.date.accessioned2014-03-14T21:48:54Zen
dc.date.adate2008-11-01en
dc.date.available2014-03-14T21:48:54Zen
dc.date.issued1996en
dc.date.rdate2008-11-01en
dc.date.sdate2008-11-01en
dc.description.abstractCombined with a conventional processing scheme, applications of stretched amplitude adjustment (SAGC), pre-stack deconvolution, and post-stack migration improve the temporal and spatial resolution of Texaco Line 6, facilitating interpretation of the salt structure geometry beneath the line. Applied through DISCO (Cogniseis) processing software along with modules developed at Virginia Tech, SAGC and prediction-error deconvolution perform whitening to enhance temporal resolution while post-stack signal enhancement and a migration edge effect attenuation (MEE) scheme improve the accuracy of Kirchoff, finite-difference, omega-x, and f-k migrations to enhance spatial resolution. Synthetic seismograms generated from checkshot velocity data tie the seismic horizons to subsurface geology. Complex trace analyses, carried out using FOCUS 2-D (Cogniseis) software, elaborate on reflector continuity and hydrocarbon accumulation. Overall, amplitude spectra of pre-stack data are enhanced by a maximum of 14 decibels between 10 and 58 Hz after SAGC and 4 decibels between 17 and 58 Hz after deconvolution. Signal enhancement improves reflector amplitude to optimize hyperbola collapse through migration. MEE expands the migration cone spatially by 3,503.7 m and temporally by approximately 42 percent, and the Kirchoff algorithm provides the most accurate migration. Pre-stack migration by Texaco reveals subhorizontal strata having a minimum period of 33.3 ms near the northeast flank of Venice Dome salt; the salt has an upward extent of 2,250 ft and is covered by smooth caprock. Resolution gains after reprocessing show strata having a minimum period of 25.0 ms; the salt is imaged deeper at 2,950 ft with a more southwesterly flank and is covered by faulted caprock. Seismic horizons correlate with Pleistocene to Miocene sand and shale layers associated with hydrocarbon production; increased resolution suggests the presence of geologic discontinuities which could interfere with producibility. Increasing seismic resolution by reprocessing existing reflection data exhibits that salt structure geometry and potential hydrocarbon traps can be better evaluated so as to help identify future prospects.en
dc.description.degreeMaster of Scienceen
dc.format.extentx, 103 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11012008-063747en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11012008-063747/en
dc.identifier.urihttp://hdl.handle.net/10919/45430en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.M566.pdfen
dc.relation.isformatofOCLC# 36222427en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectseismicen
dc.subjectresolutionen
dc.subjectprocessingen
dc.subjectsalten
dc.subjectLouisianaen
dc.subject.lccLD5655.V855 1996.M566en
dc.titleEnhancement of temporal and spatial resolution of 2-D reflection data: application to Texaco data over Venice Dome in Plaquemines Parish, Louisianaen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineGeophysicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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