1887
24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery
  • ISSN: 2202-0586
  • E-ISSN:

Abstract

We introduce a new practical least-squares reverse-time migration (LSRTM) scheme and derive a steepest descent method for optimal imaging by adapting reverse-time migration (RTM) and demigration (RTDM) as the migration and modelling operators to maximize the cross-correlation between simulated and acquired seismic data. Through real data experiments, we demonstrate that the proposed LSRTM provides high quality images with balanced amplitudes, improved focusing and enhanced resolution. The method is also capable of removing the free surface ghosts generated in towed streamer acquisition and filling holes in the imaged structures due to imperfect acquisition.

Together with impedance perturbation technique, the proposed method is a useful tool for both seismic imaging and inversion.

© 2015 ASEG
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/content/journals/10.1071/ASEG2015ab009
2015-12-01
2026-01-23

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References

  1. Dai, W., Wang, X. and Schuster, G., 2011, Least-squares migration of multisource data with a deblurring filter: Geophysics, 76, No. 5, 135-146.
  2. Dong, S., Cai, J., Guo, M., Suh, S., Zhang, Z., Wang, B. and Li, Z., 2012, Least-squares reverse time migration: towards true amplitude imaging and improving the resolution, 83rd Annual International Meeting, SEG, Expanded Abstracts, 1425-1429.
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  7. Yao, G. and Jakubowicz, H., 2012, Least-squares reverse-time migration, 83rd Annual International Meeting, SEG, Expanded Abstracts, 3406-3410.
  8. Zhang, Y. and Sun, J., 2009, Practical issues of reverse time migration: true-amplitude gathers, noise removal and harmonic-source encoding, First Break, 26, 19-25.
  9. Zhang, Y. and Duan, L., 2012, Predicting multiples using a reverse time demigration: 83rd Annual International Meeting, SEG, Expanded Abstracts, 520-524.
  10. Zhang, Y., Duan, L. and Roberts, G., 2013, True Amplitude Reverse Time Migration-From Reflectivity to Velocity and Impedance Perturbations, 75th EAGE Conference & Exhibition, Expanded Abstracts.
  11. Zhang, Y., Duan, L. and Xie, Y., 2014, A stable and practical implementation of least-squares reverse time migration, Submitted to Geophysics.
/content/journals/10.1071/ASEG2015ab009
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  • Article Type: Research Article
Keyword(s): Acquisition Footprint Removal; Band-limited Impedance Inversion; Cross-Correlative Matching; Least-Squares; Reverse Time Migration

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