Structure-distortion monitoring in time-migrated sections based on velocity trap curve L-Va

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Structure-distortion monitoring in time-migrated sections based on velocity trap curve L-VaAuthors: Shunjun LiangShiyu ZhouXiao LiangLiwei YouFu SunWei JiangShunjun LiangBGP Southwest Branch, CNPCSearch for more papers by this author, Shiyu ZhouBGP Southwest Branch, CNPCSearch for more papers by this author, Xiao LiangGeology & Exploration Research Institute, CDCC, CNPC and the State Key Laboratory of “Oil & Gas Geology and Production Engineering”, Chengdu University of TechnologySearch for more papers by this author, Liwei YouBGP Southwest Branch, CNPCSearch for more papers by this author, Fu SunBGP Southwest Branch, CNPCSearch for more papers by this author, and Wei JiangBGP Southwest Branch, CNPCSearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2985275.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractVelocity variations in complex structures will lead to velocity trap effect, distorting structures in time migrated sections. In seismic data interpretation of complex structures, it is important and challenging to predict structure distortion and to evaluate reasonability of seismic sections. The paper proposes a method to monitor structure distortion in time migrated sections. Weighted average velocity along the target stratum is calculated to obtain velocity trap curve L-Va, based on a model which integrates structure and interval velocity. Distortion, the extent of distortion, anticline crest deviation and deviated distance can be determined by observing patterns of L-Va curves. The method can help eliminate velocity trap effect during viable velocity time-depth conversion, effectively correcting distortion in time migrated sections. The reasonability and accuracy of structures and crest location in depth sections can be checked, delivering improved precision in structural trap confirmation.Presentation Date: Monday, October 15, 2018Start Time: 1:50:00 PMLocation: 210A (Anaheim Convention Center)Presentation Type: OralKeywords: velocity analysis, time migration, monitoring, steep dipPermalink: https://doi.org/10.1190/segam2018-2985275.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Shunjun Liang, Shiyu Zhou, Xiao Liang, Liwei You, Fu Sun, and Wei Jiang, (2018), "Structure-distortion monitoring in time-migrated sections based on velocity trap curve L-Va," SEG Technical Program Expanded Abstracts : 1504-1508. https://doi.org/10.1190/segam2018-2985275.1 Plain-Language Summary Keywordsvelocity analysistime migrationmonitoringsteep dipPDF DownloadLoading ...