3D Time Domain Full Waveform Inversion with Reconstructed Wavefield

PreviousNext No Access15th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 31 July-3 August 20173D Time Domain Full Waveform Inversion with Reconstructed WavefieldAuthors: Chao WangDavid YingstPaul FarmerGary MartinJacques LeveilleChao WangIONSearch for more papers by this author, David YingstIONSearch for more papers by this author, Paul FarmerIONSearch for more papers by this author, Gary MartinIONSearch for more papers by this author, and Jacques LeveilleIONSearch for more papers by this authorhttps://doi.org/10.1190/sbgf2017-056 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Conventional full waveform inversion (FWI) has been an important tool for retrieving subsurface geology information. It has been successfully applied to real seismic data for both production and research purposes. The underlying theory has been well developed and the ultimate goal is to produce high-fidelity earth models by minimizing the difference between the acquired seismic data and computer synthesized data obtained by solving the wave equation exactly. In practice, FWI is still a beneficial but challenging method for updating the subsurface model parameters. A local optimization scheme is used to solve the minimization problem and it does not prevent convergence towards local minima because of the nonlinearity and ill-posedness of the problem. For example, it may suffer from cycle skipping problems if there is a lack of low frequency data. It may also converge to a local minimum from an inaccurate starting model. To mitigate some of the issues associated with conventional FWI, we propose a new approach to time domain full waveform inversion with the reconstructed wavefield method (RFWI). RFWI replaces the exact solution of the wave equation in conventional FWI with an L2 approximation. RFWI estimates earth models and jointly reconstructs the source wavefield by minimizing a penalized objective function that includes both the data misfit and wave equation error. By extending the search space, RFWI offers potential benefits of avoiding cycle skipping and overcoming some of the problems with local minima. RFWI demonstrates more advantages in areas with strong velocity contrasts. In this paper, we first present the theory and method of time domain RFWI. We also discuss the differences and similarities between conventional FWI and RFWI. Finally, the benefits and applicability of RFWI are demonstrated using two 3D field data sets. Keywords: full-wave inversion, reconstruction, time-domainPermalink: https://doi.org/10.1190/sbgf2017-056FiguresReferencesRelatedDetailsCited bySeismic inversion method of prestack waveform of isotropic elastic medium and its application for exploration targets of shale reservoirZhanqing Yu and Cheng Wang1 September 2021 15th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 31 July-3 August 2017ISSN (online):2159-6832Copyright: 2017 Pages: 1876 publication data© 2017 Published in electronic format with permission by the Brazilian Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished Online: 03 Aug 2017 CITATION INFORMATION Chao Wang, David Yingst, Paul Farmer, Gary Martin, and Jacques Leveille, (2017), "3D Time Domain Full Waveform Inversion with Reconstructed Wavefield," SEG Global Meeting Abstracts : 285-290. https://doi.org/10.1190/sbgf2017-056 Plain-Language Summary Keywordsfull-wave inversionreconstructiontime-domainPDF DownloadLoading ...