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Pseudo-primary for multiple migration

Figure [*] and Figure [*] show the algorithm to create the pseudo-primary data for multiple migration. I cross-correlate the primary+ multiple with the multiple at the surface and extract the zero-offset dataset and one-shot dataset for comparison.

Figure [*] shows the zero-offset dataset from both the originally recorded dataset and the pseudo-primary dataset. The zero-offset dataset is very coarse, since only 32 shots are recorded in the original dataset, while the zero-offset dataset from pseudo-primary data is continuous, since every trace in the originally recorded data can be an areal shot in the pseudo-primary data. Nevertheless, as shown in Figure [*], the zero-offset dataset from pseudo-primary data is very similar to the originally recorded data.

 
zero_d
zero_d
Figure 4
Zero offset datasets. Left: The zero offset dataset of originally recorded data. Right: The zero offset dataset of pseudo-primary data.
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Figure [*] displays the comparison between one shot from originally recorded data and one from generated pseudo-primary data. Although the pseudo-primary shot is noisy, it has a similar structure to the shot from the original data.

 
mid_shot
mid_shot
Figure 5
One shot gather at 16,000m. Left: One shot gather of primary with multiples. Right: One shot gather of pseudo-primary data.
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next up previous print clean
Next: Migration for zero-offset multiple Up: Synthetic Data Example Previous: Synthetic Data Example
Stanford Exploration Project
7/8/2003