Subsurface-offset wave-equation migration velocity analysis with angle filtering

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Subsurface-offset wave-equation migration velocity analysis with angle filteringAuthors: Lei FuLei FuRice UniversitySearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2998369.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Migration velocity analysis (MVA) based on subsurface offset extended image provides a way to update the velocity model by measuring the focusing of the extended migrated image. The focusing property is introduced by a horizontal subsurface shift in the imaging condition, which expresses consistency between data and velocity model and can be understood as non-local stress-strain relations in acoustic case. However, under prototypical conditions of acquisition geometry, the existence of artefacts is very likely to deviate the velocity update from its path to the correct velocity. The cause of those artefacts can be studied by means of asymptotic analysis and numerical examples. Here, in order to mitigate those artefacts, a taper in scattering angle domain depending on acquisition geometry and imaging point is introduced. The application of the proposed new method is demonstrated by 2D synthetic examples, which shows migration velocity analysis becomes more robust. Presentation Date: Monday, October 15, 2018 Start Time: 1:50:00 PM Location: Poster Station 16 Presentation Type: Poster Keywords: velocity analysis, inversion, reflection, 2D, gathersPermalink: https://doi.org/10.1190/segam2018-2998369.1FiguresReferencesRelatedDetails 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 Lei Fu, (2018), "Subsurface-offset wave-equation migration velocity analysis with angle filtering," SEG Technical Program Expanded Abstracts : 5223-5227. https://doi.org/10.1190/segam2018-2998369.1 Plain-Language Summary Keywordsvelocity analysisinversionreflection2DgathersPDF DownloadLoading ...