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• W2892065326 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Subspace methods for time-lapse elastic full-waveform inversionAuthors: Zhen-dong ZhangTariq AlkhalifahZhen-dong ZhangKing Abdullah University of Science and TechnologySearch for more papers by this author and Tariq AlkhalifahKing Abdullah University of Science and TechnologySearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2986775.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract The application of elastic full waveform inversion on time-lapse seismic data is arising from the boom in conventional full waveform inversion. In the past few years, many different inversion strategies are introduced for the time-lapse case, taking advantage of the power of FWI in capturing small changes. However, all methods tend to suffer from the imperfect repeatability of the data acquisition and the weakness in FWI in focussing on the affected areas (i.e. the reservoir). Thus, we modify the subspace method and apply it to time-lapse elastic full waveform inversion. A soft mask calculated using the gradients of the baseline and monitoring data, which acts as a preconditioner, is introduced to localize the update area to the affected regions. Specifically, we suppress the similarities of the two gradients and at the same time highlight their differences when calculating the soft mask. The calculated soft mask can reduce the dimensionality of the inverse problem with a delicately selected threshold, which provides a feasible way to calculate the reduced Hessian matrix. Besides, it is a data-driven approach free of human intervention or apriori knowledge. For comparison, we also use a hard mask surrounding the injection area. The numerical example shows that the proposed soft mask performs better than the hard mask. Presentation Date: Tuesday, October 16, 2018 Start Time: 8:30:00 AM Location: 204C (Anaheim Convention Center) Presentation Type: Oral Keywords: elastic, time-lapse, full-waveform inversion, reservoir characterizationPermalink: https://doi.org/10.1190/segam2018-2986775.1FiguresReferencesRelatedDetailsCited byScatterer identification in a 2D geophysical medium using an augmented computational time reversal method1 January 2021 | International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 45, No. 7 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 Zhen-dong Zhang and Tariq Alkhalifah, (2018), Subspace methods for time-lapse elastic full-waveform inversion, SEG Technical Program Expanded Abstracts : 5298-5302. https://doi.org/10.1190/segam2018-2986775.1 Plain-Language Summary Keywordselastictime-lapsefull-waveform inversionreservoir characterizationPDF DownloadLoading ..." @default.
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• W2892065326 title "Subspace methods for time-lapse elastic full-waveform inversion" @default.
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