| Citation: |
Jia-jia Yang, Bing-shou He, Hua-ning Xu, Jun Pan, Jun Liu, Hong Liu, 2019. Stretching correction for amplitude-preserving vector wavefield reverse-time migration, China Geology, 2, 179-188. doi: 10.31035/cg2018071
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Stretching correction for amplitude-preserving vector wavefield reverse-time migration
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Abstract
The migration of multi-wave seismic data is aimed at obtaining the P- and S-wave imaging results of the amplitude preserving. But the P- and S-wave stretching effect produced by the reverse time migration of the elastic wave equation will not only reduce the vertical resolution of the migration results and the amplitude preserving of the large reflection angle. In this paper, the reverse time migration technique of amplitude preserving vector wave-field separating is used. Based on the analysis of the stretch mechanism and the influencing factors of stretch magnitude, the paper gave the stretch correcting factors. Then, realize the stretch correction method at the time that after the reverse extrapolation and before the imaging by solving the problem which is how to calculate the P-wave and Ps-wave propagation directions of imaging points at different times. The stretch correction method can improve the vertical resolution and amplitude fidelity of the imaging results and provide high fidelity input data for seismic data interpretation and inversion. -
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Jia-jia Yang, Bing-shou He, Hua-ning Xu, Jun Pan, Jun Liu, Hong Liu, 2019. Stretching correction for amplitude-preserving vector wavefield reverse-time migration, China Geology, 2, 179-188. doi: 10.31035/cg2018071
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- Figure 1. P-wave (a–f) and S-wave (g–l) RTM images before and after migration stretching correction.
- Figure 2. Inclined layered medium model.
- Figure 3. P- and S-wave RTM images before and after migration stretching correction with the source located in (2.5 km, 0 km).
- Figure 4. Stacked P- and S-wave RTM images before and after migration stretching correction.
- Figure 5. P- and S-wave ADCIGs before and after migration stretching correction with angle range −60°−60°.
- Figure 6. The stacked P-wave RTM images before and after migration stretching correction.
- Figure 7. Local enlargement of block A, B and C of Fig. 6.