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• W2968164435 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2019Passive seismic full waveform inversion with unknown onsets in an orthorhombic anisotropic mediumAuthors: Hanchen WangTariq AlkhalifahHanchen WangKing 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/segam2019-3214356.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractFull-waveform inversion (FWI) based methods are getting more attractive in passive seismic (microseismic) monitoring studies. A high resolution knowledge of the medium in which the events occur is crucial to proper monitoring. In most cases, not only the velocity, but also the anisotropy has a large influence on locating passive events related to hydraulic fracturing. Due to the inherent anisotropy nature of most rocks associated with unconventional reservoirs, accounting for anisotropy is even more important in such investigations. We propose a 3D acoustic orthorhombic FWI method for passive seismic events to invert for the source image, source function and the model parameters, without any a prior knowledge about source location or source function in time. In order to mitigate the effect of the unknown source ignition time, we convolve reference traces with the observed and modeled data. A total variation regularization is applied to improve the robustness of the model parameters inversion considering the limited sources and illumination angles of microseismic experiments. The adjoint-state method is used to derive the gradient for the source image, source function and the anisotropic model parameters. The proposed method produces good estimates of the source location and the model structures for the modified orthorhombic 3D SEG/EAGE overthrust model.Presentation Date: Wednesday, September 18, 2019Session Start Time: 1:50 PMPresentation Start Time: 2:15 PMLocation: 217BPresentation Type: OralKeywords: microseismic, 3D, anisotropy, full-waveform inversion, sourcesPermalink: https://doi.org/10.1190/segam2019-3214356.1FiguresReferencesRelatedDetailsCited byDownhole microseismic data interpretation for media anisotropy evaluation with limited acquisition geometry in Western SiberiaSergey Vladimirovich Yaskevich, Anton A. Duchkov, Igor N. Kerusov, Dmitriy E. Miroshnichenko, and Georgy N. Loginov15 June 2022 | Interpretation, Vol. 10, No. 3 SEG Technical Program Expanded Abstracts 2019ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2019 Pages: 5407 publication data© 2019 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 10 Aug 2019 CITATION INFORMATION Hanchen Wang and Tariq Alkhalifah, (2019), Passive seismic full waveform inversion with unknown onsets in an orthorhombic anisotropic medium, SEG Technical Program Expanded Abstracts : 3051-3055. https://doi.org/10.1190/segam2019-3214356.1 Plain-Language Summary Keywordsmicroseismic3Danisotropyfull-waveform inversionsourcesPDF DownloadLoading ..." @default.
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• W2968164435 title "Passive seismic full waveform inversion with unknown onsets in an orthorhombic anisotropic medium" @default.
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