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Volume 26 Issue 4
Aug 2015
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Jianping Huang, Chuang Li, Rongrong Wang, Qingyang Li. Plane-Wave Least-Squares Reverse Time Migration for Rugged Topography. Journal of Earth Science, 2015, 26(4): 471-480. doi: 10.1007/s12583-015-0556-5
Citation: Jianping Huang, Chuang Li, Rongrong Wang, Qingyang Li. Plane-Wave Least-Squares Reverse Time Migration for Rugged Topography. Journal of Earth Science, 2015, 26(4): 471-480. doi: 10.1007/s12583-015-0556-5

Plane-Wave Least-Squares Reverse Time Migration for Rugged Topography

doi: 10.1007/s12583-015-0556-5
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  • Corresponding author: Chuang Li, chli0409@126.com
  • Received Date: 01 Aug 2014
  • Accepted Date: 03 Dec 2014
  • Publish Date: 12 Aug 2015
  • We present a method based on least-squares reverse time migration with plane-wave encoding (P-LSRTM) for rugged topography. Instead of modifying the wave field before migration, we modify the plane-wave encoding function and fill constant velocity to the area above rugged topography in the model so that P-LSRTM can be directly performed from rugged surface in the way same to shot domain reverse time migration. In order to improve efficiency and reduce I/O (input/output) cost, the dynamic encoding strategy and hybrid encoding strategy are implemented. Numerical test on SEG rugged topography model show that P-LSRTM can suppress migration artifacts in the migration image, and compensate amplitude in the middle-deep part efficiently. Without data correction, P-LSRTM can produce a satisfying image of near-surface if we could get an accurate near-surface velocity model. Moreover, the pre-stack P-LSRTM is more robust than conventional RTM in the presence of migration velocity errors.

     

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