Velocity model building using FWI and LSRTM: Case study on 3D OBN dataset acquired from offshore Saudi Arabia

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2020Velocity model building using FWI and LSRTM: Case study on 3D OBN dataset acquired from offshore Saudi ArabiaAuthors: Young Seo KimMaxim DmitrievTong W. FeiYi LuoYoung Seo KimSaudi AramcoSearch for more papers by this author, Maxim DmitrievSaudi AramcoSearch for more papers by this author, Tong W. FeiSaudi AramcoSearch for more papers by this author, and Yi LuoSaudi AramcoSearch for more papers by this authorhttps://doi.org/10.1190/segam2020-3416120.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractWe studied applying Full Waveform Inversion (FWI) and Least Squares Reverse Time Migration (LSRTM) on a marine seismic data set for building 3D velocity models. The data set is acquired in Saudi Arabia from a 3D Ocean Bottom Node (OBN) survey with very large offsets and considerable low frequencies. In our study, first, FWI is performed with the tomographic part of the gradient kernel to obtain long-wavelength background velocity. The tomographic part of the kernel was formed from forward-propagated source signals and backward-propagated wavefields. Second, we run LSRTM to reveal detailed structures on top of the smoothed FWI model. In the LSRTM step, we also incorporated wavefield decomposition technique in order to recover correct reflectivity. We evaluated the proposed approach by analyzing the quality of depth migration images and the flatness of angle-domain common image gathers.Presentation Date: Tuesday, October 13, 2020Session Start Time: 9:20 AMPresentation Time: 11:25 AMLocation: Poster Station 3Presentation Type: PosterKeywords: full-waveform inversion, least-squares migration, ocean-bottom nodePermalink: https://doi.org/10.1190/segam2020-3416120.1FiguresReferencesRelatedDetails 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 Young Seo Kim, Maxim Dmitriev, Tong W. Fei, and Yi Luo, (2020), "Velocity model building using FWI and LSRTM: Case study on 3D OBN dataset acquired from offshore Saudi Arabia," SEG Technical Program Expanded Abstracts : 815-819. https://doi.org/10.1190/segam2020-3416120.1 Plain-Language Summary Keywordsfull-waveform inversionleast-squares migrationocean-bottom nodePDF DownloadLoading ...