Estimation of Shear wave velocities from P-P and P-S seismic data using Equivalent Offset Migration

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atmire.migration.oldid411
dc.contributor.advisorBancroft, John Campbell
dc.contributor.authorGuirigay, Thais America
dc.date.accessioned2012-10-03T21:16:22Z
dc.date.available2012-11-13T08:01:48Z
dc.date.issued2012-10-03
dc.date.submitted2012en
dc.description.abstractPrestack migration of converted wave data requires accurate acoustic and shear wave velocities Vp and Vs. This thesis presents new methods to estimate the shear velocities using a single converted wave velocity Vc, that combines Vp and Vs. The acoustic velocity Vp, and a constant value for the Vp/Vs ratio are used to make an initial estimate of the converted wave velocity, Vc. Narrow range gathers are formed using the initial estimate of Vc that are then processed to obtained a refined value of Vc. This refined value is then used to estimate Vs. The estimated Vs is used with Vp in a full prestack migration using the equivalent offset method (EOM) to form complete prestack migration gathers. Velocity analysis of these gathers produces a more accurate Vc which is used to complete the prestack migration. The quality of the method is demonstrated for the cases of one synthetic dataset and two real datasets. The results show superior imaging when compared with alternative migration algorithms.en_US
dc.identifier.citationGuirigay, T. A. (2012). Estimation of Shear wave velocities from P-P and P-S seismic data using Equivalent Offset Migration (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/25959en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/25959
dc.identifier.urihttp://hdl.handle.net/11023/280
dc.language.isoeng
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectGeophysics
dc.subject.classificationConverted waveen_US
dc.subject.classificationImagingen_US
dc.subject.classificationshear velocitiesen_US
dc.subject.classificationEquivalent offset migrationen_US
dc.subject.classificationMigrationen_US
dc.titleEstimation of Shear wave velocities from P-P and P-S seismic data using Equivalent Offset Migration
dc.typemaster thesis
thesis.degree.disciplineGeoscience
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue

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