3D-9C seismic survey for direct S-wave processing and interpretation

PreviousNext No AccessSecond International Meeting for Applied Geoscience & Energy3D-9C seismic survey for direct S-wave processing and interpretationAuthors: Rui ZhangZhiwen DengYuanyuan YueYan WangRui ZhangUniversity of Louisiana at LafayetteSearch for more papers by this author, Zhiwen DengBGP Inc., China National Petroleum CorporationSearch for more papers by this author, Yuanyuan YueBGP Inc., China National Petroleum CorporationSearch for more papers by this author, and Yan WangBGP Inc., China National Petroleum CorporationSearch for more papers by this authorhttps://doi.org/10.1190/image2022-w16-05.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractConventional P-wave seismic data showed widespread gas clouds in Sanhu area from Qaidam Basin, west China, which made it difficult to map out the subsurface structure because the P-wave is strongly attenuated by the gas clouds. This leads us to use 3D-9C seismic survey to obtain the direct S- wave seismic image by using a S-wave source, which is believed to be little affected by the gas clouds and produce clearer subsurface structure. By using a powerful S-wave vibrator, we can utilize most conventional P-wave seismic data processing techniques to process the direct S-wave data, except the shear wave splitting. Shear wave splitting is an intrinsic characteristic of S-wave propagation through anisotropic media, which splits the incident S-wave into fast (S1) and slow (S2) S-waves. To obtain the reliable split S- wave images from 3D-9C datasets, three kinds of techniques were used: (1) Source correction; (2) radial-transverse (RT) rotation; (3) S-waves splitting. Sanhu area suffers from the strong near surface weathering layer, which results in a thick low-velocity-zone. To address this issue, a ground roll inversion-based surface statistics method was used to improve the quality of S-wave image. The obtained split S- wave images show much clearer subsurface structure, which allows us to study the deposition history and map out the distribution of the channels with lower uncertainty than using P-wave seismic data. The S-wave data is also used for reservoir characterization through S-wave inversion results in collaboration with well-log data.Keywords: direct S-wave, shear wave splittingPermalink: https://doi.org/10.1190/image2022-w16-05.1FiguresReferencesRelatedDetails Second International Meeting for Applied Geoscience & EnergyISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2022 Pages: 3694 publication data© 2022 Published in electronic format with permission by the Society of Exploration Geophysicists and the American Association of Petroleum GeologistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 15 Aug 2022 CITATION INFORMATION Rui Zhang, Zhiwen Deng, Yuanyuan Yue, and Yan Wang, (2022), "3D-9C seismic survey for direct S-wave processing and interpretation," SEG Technical Program Expanded Abstracts : 3676-3680. https://doi.org/10.1190/image2022-w16-05.1 Plain-Language Summary Keywordsdirect S-waveshear wave splittingPDF DownloadLoading ...