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Abstract

Summary

We consider the elastic effects on an acoustic full waveform inversion generated by a synthetic pre-salt model of Santos basin, Brazil. We used P/S-velocity and density models to generate shot-gathers with acoustic, elastic (isotropic), constant and variable density modelling. The comparison of the amplitudes of the shot-gathers already provides a clue to the challenges acoustic FWI may face, as acoustic modelling is not able to provide the correct amplitude for the elastic data. This test is complemented with a constant-density acoustic FWI inversion, for all the different datasets, but with the same algorithm and parameterization. FWI with acoustic data was able to retrieve the correct information of high velocity sediments in the post/pre-salt environment and the stratification of the evaporitic sequence. On the other hand, the inversion of elastic data could not properly invert anything underneath the top of salt. The comparison of the inversion results indicates a direction in which algorithm and simplifications can be done to pursue an adequate property inversion.

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/content/papers/10.3997/2214-4609.20141219
2014-06-16
2024-04-25

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20141219
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Numerical Experiments of Full Waveform Inversion on a Typical Pre-salt Model - Part 2 - Elastic Effects
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20141219
/content/papers/10.3997/2214-4609.20141219
/content/papers/10.3997/2214-4609.20141219
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