Q-compensated least-squares reverse time migration using low-rank one-step wave extrapolation

By Junzhe Sun, Sergey Fomel, T. Zhu, Jingwei Hu. 2016

102 citations recorded by the source corpus.

ABSTRACTAttenuation of seismic waves needs to be taken into account to improve the accuracy of seismic imaging. In viscoacoustic media, reverse time migration (RTM) can be performed with Q-compensation, which is also known as Q-RTM. Least-squares RTM (LSRTM) has also been shown to be able to compensate for attenuation through linearized inversion. However, seismic attenuation may significantly slow down the convergence rate of the least-squares iterative inversion process without proper preconditioning. We have found that incorporating attenuation compensation into LSRTM can improve the speed of convergence in attenuating media, obtaining high-quality images within the first few iterations. Based on the low-rank one-step seismic modeling operator in viscoacoustic media, we have derived its adjoint operator using nonstationary filtering theory. The proposed forward and adjoint operators can be efficiently applied to propagate viscoacoustic waves and to implement attenuation compensation. Recognizing that, ...

Subfields: Geophysics, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/67b2064752882484b1dd66364942062666a5eef5

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In Geophysics

1. Xiongqiang Ma
2. Hui Zhou
3. Yufeng Wang
4. Yangkang Chen

In Ocean Engineering

1. Xiongqiang Ma
2. Hui Zhou
3. Yufeng Wang
4. Yangkang Chen

Citations in the corpus

• L1−2 minimization for exact and stable seismic attenuation compensation (2018, background): “…by guest on 26 March 2018 1630 Y. Wang et al. Mittet 2007; Zhang et al. 2012), Q-compensated reverse time migration (Zhang et al. 2010; Zhu et al. 2014; Li et al. 2016b; Sun et al. 2016) and Q-compensated Gaussian beam migration (Bai et al. 2016).”