Reverse time migration of multiples: Reducing migration artifacts using the wavefield decomposition imaging condition
| Autor: | Yibo Wang, Xu Chang, Yi Luo, Tong W. Fei, Qingfeng Xue, Yikang Zheng |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Noise (signal processing) business.industry Acoustics Seismic migration Function (mathematics) 010502 geochemistry & geophysics Wave equation 01 natural sciences Synthetic data symbols.namesake Geophysics Optics Geochemistry and Petrology symbols Decomposition (computer science) Hilbert transform business Geology Multiple 0105 earth and related environmental sciences |
| Zdroj: | GEOPHYSICS. 82:S307-S314 |
| ISSN: | 1942-2156 0016-8033 |
| Popis: | In the implementation of migration of multiples, reverse time migration (RTM) is superior to other migration algorithms because it can handle steeply dipping structures and offer high-resolution images of the complex subsurface. However, the RTM results using two-way wave equation contain high-amplitude, low-frequency noise and false images generated by improper wave paths in migration velocity model with sharp velocity interfaces or strong velocity gradients. To improve the imaging quality in RTM of multiples, we separate the upgoing and downgoing waves in the propagation of source and receiver wavefields. A complex function involved with the Hilbert transform is used in wavefield decomposition. Our approach is cost effective and avoids the large storage of wavefield snapshots required by the conventional wavefield separation technique. We applied migration of multiples with wavefield decomposition on a simple two-layer model and the Sigsbee 2B synthetic data set. Our results demonstrate that the proposed approach can improve the image generated by migration of multiples significantly. |
| Databáze: | OpenAIRE |
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