Kirchhoff prestack time migration (PSTM), which works trace-by-trace, remains appealing to academia and industry due to its robustness and efficiency. However, like the other prestack migration methods, Kirchhoff PSTM also suffers from the angle-dependent stretching effect, which narrows the amplitude spectra of seismic data. This effect gets more severe as the incident angle increases. In this paper, we propose a novel approach, which attaches a prediction shaping filter to the Kirchhoff PSTM, to mitigate the stretching effect. Our approach takes advantage on the trace-by-trace implementation of the PSTM algorithm, without the output of the angle-domain common-imaging gather (ADCIG). Also, our method can cascade with Q-compensation in PSTM. We examine our method with numerical examples and one field data.
|Original language||English (US)|
|Number of pages||10|
|State||Published - Sep 12 2018|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors are grateful to editor Ian F. Jones and two anonymous reviewers. The authors thanks D. Peter and J. Wang for fruitful discussions. The work was supported by the Elastic Seismic Imaging project of CNPC. The work was also supported by the King Abdullah University of Science & Technology.