Multi-Parameter Inversion of Land Seismic Data in Elastic Vertically Transversely Isotropic Media

The choice of the parameterization may influence the final waveform inversion result. An analysis based on radiation patterns can be carried out before a multi-parameter inversion. One approach is to favor the parameterizations that reduce the overlapping between the radiation patterns. While this limits the cross-talk, each parameter is sensitive to only a certain angle range. In complex geological structures, where shadow zone occur, it may become difficult to avoid inversion artefacts due to the irregular angle coverage at each sub-surface point. Another approach is to favor a parameterization containing a parameter with a full angle sensitivity. This choice may help us to reduce the inversion artefacts due to the irregular angle coverage in the recovery of the parameter with the full-angle sensitivity. The other parameters may be less well recovered depending on the angle coverage at the sub-surface point.

In this presentation, we analyse a complex land VTI elastic synthetic example. The results indicate that the parameterization containing a full-angle-sensitivity parameter is superior. This study also shows that it is important to analyse the angle coverage at each sub-surface point together with the radiation patterns.