Iteration with prestack data

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Seismic Data Analysis
Seismic-data-analysis.jpg
Series Investigations in Geophysics
Author Öz Yilmaz
DOI http://dx.doi.org/10.1190/1.9781560801580
ISBN ISBN 978-1-56080-094-1
Store SEG Online Store


To compare with iterative depth migration applied to zero-offset and CMP-stacked data, we shall examine the performance of iterative depth migration applied to prestack data. Techniques for prestack depth migration itself, however, will be reviewed in the next section. Depth migration of the prestack data using the true model (Model A) shown in Figure 8.2-11 required only one iteration to achieve convergence (Figure 8.2-24).

Next, consider Model D in Figure 8.2-25 in which the salt velocity and the base-salt boundary are incorrectly specified. After the third iteration with the prestack data, we find that convergence is achieved. Nevertheless, the final solution has converged to a velocity-depth model that is different from the true model.

If the initial model contains errors in reflector geometries only, and layer velocities are specified correctly, then convergence using the prestack data to true velocity-depth model is achievable (Figure 8.2-26).

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Iteration with prestack data
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