Summary

In RTM imaging, double top salt (DTS) is frequently seen but difficult to remove by conventional post-RTM processing. This paper analyzes the DTS characteristics and demonstrates that the reason for DTS is shallower than true top of salt (TOS) placement or higher than true supra salt velocity or both present in the migration model. By introducing delayed imaging time (DIT) scan and DIT gathers, DTS events can be easily recognized and removed. Several field examples have shown the effectiveness of this method with greatly improved TOS images.

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