Modified interferometric imaging condition for reverse-time migration
Xue-Bao Guo 1 2 4 Hong Liu 1 2 Ying Shi 31 Institute of Geology and Geophysics, Chinese Academy of Sciences, Key Laboratory of Petroleum Resources Research, Beijing 100029, China.
2 University of Chinese Academy of Sciences, Beijing 100049, China.
3 Northeast Petroleum University, School of Earth Science, Science and Technology Innovation Team on Fault Deformation, Sealing and Fluid Migration, Daqing 163318, China.
4 Corresponding author. Email: guoxuebao@mail.iggcas.ac.cn
Exploration Geophysics 49(2) 202-212 https://doi.org/10.1071/EG16116
Submitted: 20 July 2016 Accepted: 1 December 2016 Published: 5 January 2017
Abstract
For reverse-time migration, high-resolution imaging mainly depends on the accuracy of the velocity model and the imaging condition. In practice, however, the small-scale components of the velocity model cannot be estimated by tomographical methods; therefore, the wavefields are not accurately reconstructed from the background velocity, and the imaging process will generate artefacts. Some of the noise is due to cross-correlation of unrelated seismic events. Interferometric imaging condition suppresses imaging noise very effectively, especially the unknown random disturbance of the small-scale part. The conventional interferometric imaging condition is extended in this study to obtain a new imaging condition based on the pseudo-Wigner distribution function (WDF). Numerical examples show that the modified interferometric imaging condition improves imaging precision.
Key words: artefacts, interferometric imaging condition, reverse-time migration, small-scale components.
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