Near-surface azimuthal anisotropy analysis based on first arrival traveltime

Ma Qingpo,Ning Hongxiao,Kong Fanyong,Wang Liye,Yang Xiaoling

doi:10.1190/segam2020-3426339.1

Ma Qingpo, Ning Hongxiao + Show 3 more

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PreviousNext No AccessSEG Technical Program Expanded Abstracts 2020Near-surface azimuthal anisotropy analysis based on first arrival traveltimeAuthors: Ma QingpoKong FanyongNing HongxiaoYang XiaolingWang LiyeMa QingpoBGP, CNPCSearch for more papers by this author, Kong FanyongBGP, CNPCSearch for more papers by this author, Ning HongxiaoBGP, CNPCSearch for more papers by this author, Yang XiaolingBGP, CNPCSearch for more papers by this author, and Wang LiyeBGP, CNPCSearch for more papers by this authorhttps://doi.org/10.1190/segam2020-3426339.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractNot only does the near surface azimuthal anisotropy affect P-wave travel time and amplitude of deep target, it has a great influence on first arrival traveltime. The near surface model building and static correction methods based on isotropy assumption can’t solve this problem effectively. To understand the effects of the near surface azimuthal anisotropy on the first arrival traveltime, firstly, the basic isotropic refraction equation is extended to the azimuthal anisotropic medium; and then through a very simple two-layer HTI medium model, the effect of the near surface azimuthal anisotropy on the first arrival traveltime and the regular variations of the first arrivals of the same offset with the observation directions are shown, which is consistent with the variation of the first arrival traveltime observed in practice. Compared with the effect of azimuthal anisotropy on travel time, the effect of near surface azimuthal anisotropy on the delay time is relatively small. Also, the estimated result of the near surface anisotropic parameters by using the variation of the first arrivals with the azimuth on real data are shown, and the maximum amplitude of the anisotropy reaches 32%. This information provides the possibility of eliminating the influence of the near surface azimuthal anisotropy on seismic imaging.Presentation Date: Wednesday, October 14, 2020Session Start Time: 1:50 PMPresentation Time: 3:30 PMLocation: Poster Station 5Presentation Type: PosterKeywords: near surface, anisotropy, azimuth, traveltime, refractionPermalink: https://doi.org/10.1190/segam2020-3426339.1FiguresReferencesRelatedDetails 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 Ma Qingpo, Kong Fanyong, Ning Hongxiao, Yang Xiaoling, and Wang Liye, (2020), "Near-surface azimuthal anisotropy analysis based on first arrival traveltime," SEG Technical Program Expanded Abstracts : 2039-2043. https://doi.org/10.1190/segam2020-3426339.1 Plain-Language Summary Keywordsnear surfaceanisotropyazimuthtraveltimerefractionPDF DownloadLoading ...

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