A stable Q compensated reverse time migration method based on excitation amplitude imaging condition
- Qingqing Li (China University of Petroleum–East China) | Zhenchun Li (China University of Petroleum–East China) | Hui Zhou (China University of Petroleum–Beijing) | Xuebin Zhao (China University of Petroleum–Beijing) | Shaohuan Zu (China University of Petroleum–Beijing)
- Document ID
- Society of Exploration Geophysicists
- 2017 SEG International Exposition and Annual Meeting, 24-29 September, Houston, Texas
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Exploration Geophysicists
- Q, Imaging
- 1 in the last 30 days
- 15 since 2007
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The stability and efficiency, especially the stability, are generally concerned issues in Q compensated reverse time migration (Q-RTM). The instability occurs due to the exponential amplitude increasing during the forward or backward wavefield propagation. The regularization and low-pass filtering method are two effective strategies to overcome the instability of the wave propagation in Q-RTM. However, the regularization parameters are determined experimentally, and the wavefield cannot be recovered accurately. The low-pass filtering method cannot balance the selection of cutoff frequency for varying Q values, and may dam the effective signals. In this paper, we present a stable Q-RTM algorithm based on the excitation amplitude imaging condition, which can compensate both the amplitude attenuation and phase dispersion. Unlike the existing Q-RTM algorithms enlarging the amplitude, our new algorithm attenuates the amplitude again during both the forward and backward wavefield propagation. Therefore, the new Q-RTM algorithm is absolutely stable. We test our Q-RTM using a realistic BP gas model, and compare the Q-RTM images to the reference images obtained by the acoustic RTM with acoustic seismic data. The new Q-RTM results match the reference images quite well.
Presentation Date: Wednesday, September 27, 2017
Start Time: 1:50 PM
Presentation Type: ORAL
|File Size||1 MB||Number of Pages||5|
Dutta,G., andG. T.Schuster,2014,Attenuation compensation for least-squares reverse time migration using the viscoacoustic-wave equation:Geophysics,79, no.6,S251–S262,10.1190/geo2013-0414.1.
Li,Q.,H.Zhou,Q.Zhang,H.Chen, andS.Sheng,2016,Efficient reverse time migration based on fractional Laplacian viscoacoustic wave equation:Geophysical Journal International,204,488–504,10.1093/gji/ggv456.
Sun,J. Z.,T. Y.Zhu, andS.Fomel,2015,Viscoacoustic modeling and imaging using low-rank approximation:Geophysics,80, no.5,A103–A108,10.1190/geo2015-0083.1.
Wang,Y.,2002,A stable and efficient approach of inverse Q filtering:Geophysics,67,657–663,10.1190/1.1468627.
Yan,H., andY.Liu,2013,Visco-acoustic prestack reverse-time migration based on the time-space domain adaptive high-order finite-difference method:Geophysical Prospecting,61,941–954.10.1111/1365-2478.12046.
Yuan,S. Y.,S. X.Wang,N.Tian, andZ. J.Wang,2016,Stable inversion-based multitrace deabsorption method for spatial continuity preservation and weak signal compensation:Geophysics,81, no.3,V199–V212,10.1190/geo2015-0247.1.
Zhu,T.,J. M.Harris, andB.Biondi,2014,Q-compensated reverse time migration:Geophysics,79, no.3,S77–S87,10.1190/geo2013-0344.1.