Seismic adaptive optics (2014)

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2014Seismic adaptive opticsAuthors: John T. Etgen*Imtiaz AhmedMin ZhouJohn T. Etgen*BP, Imtiaz AhmedBP, and Min ZhouBPhttps://doi.org/10.1190/segam2014-0867.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Wave equation migration can usually produce high-quality images below complex overburden given sufficient data and an accurate velocity model. However, inaccurately estimated high-contrast, short-wavelength, buried velocity anomalies disrupt the images of seismic reflections from deeper layers. Currently we solve this problem by building velocity models either with tomographic techniques or interpretation-based techniques. Existing velocity model construction methods based on interpretation and insertion of complex model boundaries are time consuming, tedious to implement, and error-prone. More-automated velocity model construction methods such as tomography (Stork, 1992), wave equation migration velocity analysis (Biondi and Sava, 1999) and FWI (Sirgue and Pratt, 2003) tend not to have enough resolution to define boundaries with sufficient sharpness, or may not have sufficient depth of investigation to handle very complex velocity boundaries at arbitrary locations in the model. Velocity anomalies that are rapidly varying in space have similarity to one of the problems encountered in ground-based optical astronomy. Resolution and accuracy of astronomical images is often limited by "atmospheric seeing", the temporal and spatial variation in the speed of light due to localized temperature-induced density differences in air. In optical astronomy this problem is addressed by physically adjusting optical elements or "adapting" the optical imaging system to remove the phase errors in the wavefronts before they reach the imaging sensor (Beckers, 1993). We suggest a similar approach for the problem of short-wavelength velocity anomalies for seismic waves. We adaptively sense seismic wavefront errors during the wave propagation calculations in migration, and adjust the seismic imaging system either by applying phase/time shifts to the wavefield or by adjusting velocity boundaries automatically to improve seismic images below the complex velocity structure. Keywords: imaging, velocity, depth migration, extrapolationPermalink: https://doi.org/10.1190/segam2014-0867.1FiguresReferencesRelatedDetailsCited byLeast-squares reverse time migration in the presence of velocity errorsJizhong Yang, Yunyue Elita Li, Arthur Cheng, Yuzhu Liu, and Liangguo Dong16 October 2019 | GEOPHYSICS, Vol. 84, No. 6Improving seismic image using the common-horizon panelLu Liu6 September 2019 | GEOPHYSICS, Vol. 84, No. 5Improve seismic image using plane-wave time-lag panelLu Liu and Yi Luo27 August 2018Optimal stacking for CIGs gathersLinbin Zhang and Paul Williamson27 August 2018A guide to least-squares reverse time migration for subsalt imaging: Challenges and solutionsChong Zeng, Shuqian Dong, and Bin Wang15 May 2017 | Interpretation, Vol. 5, No. 3Residual Redistribution for Robust InversionMadhav Vyas and John Etgen17 August 2017Improving the stacking quality of angle-domain common-image gathers based on local warping and simulated annealingHejun Zhu17 August 2017Seismic adaptive optics with a guide imageSimon Luo, John Etgen, and Min Zhou17 August 2017Seismic Processing: Migration II Complete Session17 August 2017The Garden Banks model experienceJoe Dellinger, Andrew J. Brenders, J. R. Sandschaper, Carl Regone, John Etgen, Imtiaz Ahmed, and K. J. Lee31 January 2017 | The Leading Edge, Vol. 36, No. 2Deepwater fold-and-thrust imaging: A case study with joint inversion, tomography, and dense velocity analysisChung-Chi Shih, Luca Masnaghetti, Marco Mantovani, Luciana Luca, Kate Hayo, Tien-Huei Wang, Zengbao Chen, Eva Reid, Scott Langdale, and August Lau1 September 2016Seismic Velocity Estimation Complete Session1 September 2016Adaptive least-squares RTM with applications to subsalt imagingChong Zeng, Shuqian Dong, and Bin Wang2 March 2016 | The Leading Edge, Vol. 35, No. 3Subsalt image enhancement by automatic picking top of salt using RTM time-lag gathers and surface warpingChaoshun Hu, Uwe Albertin, and Konstantin Osypov19 August 2015 SEG Technical Program Expanded Abstracts 2014ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2014 Pages: 5183 publication data© 2014 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 05 Aug 2014 CITATION INFORMATION John T. Etgen*, Imtiaz Ahmed, and Min Zhou, (2014), "Seismic adaptive optics," SEG Technical Program Expanded Abstracts : 4411-4415. https://doi.org/10.1190/segam2014-0867.1 Plain-Language Summary Keywordsimagingvelocitydepth migrationextrapolationPDF DownloadLoading ...