Broadband least-squares reverse time migration for complex structure imaging

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2014Broadband least-squares reverse time migration for complex structure imagingAuthors: Chong Zeng*Shuqian DongJian MaoBin WangChong Zeng*TGS, Shuqian DongTGS, Jian MaoTGS, and Bin WangTGShttps://doi.org/10.1190/segam2014-1283.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We propose a practical solution to overcome the frequency band limitation of conventional reverse time migration (RTM) through a least-squares migration approach. We first generate a high-frequency depth image by migrating deghosted marine seismic data using one-way wave equation migration (WEM). Then we use this high-frequency image as the initial model of band-limited least-squares reverse time migration (LSRTM) and refine the image to enhance the low-frequency components and gradually recover the weak energy from complex structures. The original high-frequency components on the WEM image are maintained. Misplaced steep dips on the WEM image due to wide-angle approximation are also corrected after LSRTM. The final output image contains not only high-frequency and high-resolution horizons but also clear complex structures with sharp geologic boundaries. Compared to the method that directly computes broadband RTM images with high frequencies (greater than 40 Hz), our broadband LSRTM approach is more computationally affordable. We demonstrate the effectiveness of the proposed broadband LSRTM work flow with 2D and 3D real data examples. Keywords: imaging, least squares, depth migration, reverse-time, broadbandPermalink: https://doi.org/10.1190/segam2014-1283.1FiguresReferencesRelatedDetailsCited ByAppendix C : Bibliography31 July 2019One-step data-domain least-squares reverse time migrationQiancheng Liu and Daniel Peter2 July 2018 | GEOPHYSICS, Vol. 83, No. 4Preconditioned acoustic least-squares two-way wave-equation migration with exact adjoint operatorLinan Xu and Mauricio D. Sacchi14 November 2017 | GEOPHYSICS, Vol. 83, No. 1A 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. 3Adaptive least-squares RTM with applications to subsalt imagingChong Zeng, Shuqian Dong, and Bin Wang2 March 2016 | The Leading Edge, Vol. 35, No. 3Adaptive least-squares RTM and application to Freedom WAZ subsalt imagingChong Zeng*, Shuqian Dong, Zhaohong Wu, Jean Ji, Darrell Armentrout, and Bin Wang19 August 2015Least-squares reverse time migration: Inversion-based imaging toward true reflectivityChong Zeng, Shuqian Dong, and Bin Wang4 September 2014 | The Leading Edge, Vol. 33, No. 9 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: 05 Aug 2014 CITATION INFORMATION Chong Zeng*, Shuqian Dong, Jian Mao, and Bin Wang, (2014), "Broadband least-squares reverse time migration for complex structure imaging," SEG Technical Program Expanded Abstracts : 3715-3719. https://doi.org/10.1190/segam2014-1283.1 Plain-Language Summary Keywordsimagingleast squaresdepth migrationreverse-timebroadbandPDF DownloadLoading ...