Wave‐equation migration velocity analysis using extended images

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2009Wave‐equation migration velocity analysis using extended imagesAuthors: Tongning YangPaul SavaTongning YangCenter for Wave Phenomena, Colorado School of MinesSearch for more papers by this author and Paul SavaCenter for Wave Phenomena, Colorado School of MinesSearch for more papers by this authorhttps://doi.org/10.1190/1.3255640 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Wave‐equation migration velocity analysis (WEMVA) is a velocity estimation technique designed to invert for velocity information using migrated images. Its capacity for handling multi‐pathing makes it appropriate in complex subsurface regions characterized by strong velocity variation. WEMVA operates by establishing a linear relation between a velocity model perturbation and a corresponding migrated image perturbation. The linear relationship is derived from conventional extrapolation operators and it inherits the main properties of frequency‐domain wavefield extrapolation. A key step in implementing WEMVA is to design an appropriate procedure for constructing image perturbations. Using time‐lag extended images, one can characterize the error in migrated images by defining the focusing error as the shift of the focused reflection along the time‐lag axis. Under the linear approximation, the focusing error can be transformed into an image perturbation by multiplying it with an image derivative taken relative to the time‐lag parameter. The resulting image perturbation is thus a mapping of the velocity error in image space. This approach is computationally efficient and simple to implement, and no further assumptions about smoothness and homogeneity of the velocity model and reflector geometry are needed. Synthetic examples demonstrate the successful application of our method to a complex velocity model.Permalink: https://doi.org/10.1190/1.3255640FiguresReferencesRelatedDetailsCited byImage-domain DAS 3D VSP elastic transmission tomography28 October 2022 | Geophysical Journal International, Vol. 232, No. 3True-amplitude migration through regularized extended linearized waveform inversionEttore Biondi, Mark A. Meadows, and Biondo Biondi10 November 2021 | GEOPHYSICS, Vol. 87, No. 1Amplitude preserving migration through extended acoustic least-squares RTMEttore Biondi, Mark Meadows, and Biondo Biondi10 August 2019Coherence-based time migration velocity analysis by the use of supergathersMomoe Sakamori and Ricardo Biloti11 January 2018 | GEOPHYSICS, Vol. 83, No. 2Offset domain common image gather based wave-equation migration velocity analysisZhennan Yu and Yang Liu31 May 2017Differential semblance optimization method with angle-domain CigsRen Fang1 September 2016Simultaneous inversion of full data bandwidth by tomographic full-waveform inversionBiondo Biondi and Ali Almomin22 May 2014 | GEOPHYSICS, Vol. 79, No. 3Tomographic full-waveform inversion (TFWI) by combining FWI and wave-equation migration velocity analysisBiondo Biondi and Ali Almomin3 September 2013 | The Leading Edge, Vol. 32, No. 9Fast 3D migration-velocity analysis by wavefield extrapolation using the prestack exploding-reflector modelClaudio Guerra and Biondo Biondi23 November 2011 | GEOPHYSICS, Vol. 76, No. 5Correlation‐based wave‐equation migration velocity analysisAli Almomin25 May 2012Extended imaging conditions for wave-equation migration13 December 2010 | Geophysical Prospecting, Vol. 59, No. 1Moveout analysis of wave-equation extended imagesTongning Yang and Paul Sava10 September 2010 | GEOPHYSICS, Vol. 75, No. 4Wave‐equation migration velocity analysis with extended common‐image‐point gathersTongning Yang and Paul Sava21 October 2010 SEG Technical Program Expanded Abstracts 2009ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2009 Pages: 4338 publication data© 2009 Copyright © 2009 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 14 Oct 2009 CITATION INFORMATION Tongning Yang and Paul Sava, (2009), "Wave‐equation migration velocity analysis using extended images," SEG Technical Program Expanded Abstracts : 3715-3719. https://doi.org/10.1190/1.3255640 Plain-Language Summary PDF DownloadLoading ...