Evaluating Kirchhoff migration using wave-equation generated maximum amplitude traveltimes

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2020Evaluating Kirchhoff migration using wave-equation generated maximum amplitude traveltimesAuthors: Hu JinJohn EtgenHu JinBP and John EtgenBPhttps://doi.org/10.1190/segam2020-3425618.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractSurface-offset gathers are often preferred to subsurface angle gathers during tomographic velocity updates and velocity model QC. This is because angle gathers have few live traces in the deeper parts of a seismic image even though fold or data redundancy is the highest at late times and deep depths. Wave-equation based surface-offset gathers can be generated, but they are usually seen to be too expensive to be used in common practice. Therefore, we still often rely on conventional ray-based Kirchhoff migration to output surface-offset gathers. Its main limitation is traveltime computation, which is not accurate in complex velocity models. There exist methods of maximum-amplitude traveltime computation based on the wave equation, which produce traveltime maps that can be applied to Kirchhoff migration. Following those ideas, we perform a Kirchhoff migration to output surface offset gathers using traveltime computation by an excitation-amplitude imaging condition. With both synthetic and real data examples, we evaluate the method by comparing with wave-equation Kirchhoff migration.Presentation Date: Wednesday, October 14, 2020Session Start Time: 1:50 PMPresentation Time: 4:45 PMLocation: 362DPresentation Type: OralKeywords: Kirchhoff, depth migration, common offset, wave equationPermalink: https://doi.org/10.1190/segam2020-3425618.1FiguresReferencesRelatedDetailsCited byWave-equation traveltime and amplitude for Kirchhoff migrationYu Pu, Gang Liu, Diancheng Wang, Hui Huang, and Ping Wang1 September 2021Improving seismic images for frontier exploration in East Coast Canada: Lessons learnedJun Cai, Jin Tan, Xiaojing Liu, Pengfei Dong, Timmy Dy, and Weiping Gou1 September 2021 SEG Technical Program Expanded Abstracts 2020ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2020 Pages: 3887 publication data© 2020 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 30 Sep 2020 CITATION INFORMATION Hu Jin and John Etgen, (2020), "Evaluating Kirchhoff migration using wave-equation generated maximum amplitude traveltimes," SEG Technical Program Expanded Abstracts : 2968-2972. https://doi.org/10.1190/segam2020-3425618.1 Plain-Language Summary KeywordsKirchhoffdepth migrationcommon offsetwave equationPDF DownloadLoading ...