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Conclusions

We showed how different modes of multiple reflections present in Sigsbee2b data behave after migration. The multiple reflections we face are not surface-related; therefore, they can still persist after multiple attenuation during processing. As the model used to compute this dataset is based on a realistic geological setting, the same behavior is likely to happen in real data. We explored the separability of primaries from multiples after migration by applying simple $ k_x-k_h$ filters. Once discriminated, primaries and multiples were submitted to a simultaneous, adaptive, non-stationary filtering to adjust amplitude and phase and decrease the cross-talk between them. The adapted multiples were then subtracted from the migrated data.

The inversion results show that, if the physics of the wave-propagation is not adequate to account for all the propagation modes in the migrated data, coherent noise - in our case multiples - will dominate the residual space, decreasing the efficiency of inversion. It is imperative, therefore, to make data satisfy the physical approximations by means of pre-processing that, in some sense reconciles processing and inversion.


next up previous [pdf]

Next: Bibliography Up: Reconciling processing and inversion: Previous: Results

2009-04-13