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Plane-wave least-squares reverse time migration for rugged topography

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Abstract

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 PLSRTM is more robust than conventional RTM in the presence of migration velocity errors.

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Authors and Affiliations

  1. School of Geosciences, China University of Petroleum (East China), Qingdao, 266580, China

    Jianping Huang, Chuang Li & Qingyang Li

  2. College of Information and Control Engineering, China University of Petroleum (East China), Qingdao, 266580, China

    Rongrong Wang

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  1. Jianping Huang
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  2. Chuang Li
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  4. Qingyang Li
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Correspondence to Chuang Li.

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Huang, J., Li, C., Wang, R. et al. Plane-wave least-squares reverse time migration for rugged topography. J. Earth Sci. 26, 471–480 (2015). https://doi.org/10.1007/s12583-015-0556-5

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