Mirror migration on the downgoing waves produced superior images than the upgoing waves, especially on the shallow section for OBS data. However, similar to upgoing waves, the downgoing waves contain source-generated multiples. These source-side multiples often interfere with the reservoir signals, making interpretation difficult. I extended the wavefield extrapolation demultiple technique designed for upgoing waves to handle the multiples on the downgoing waves. The new workflow was successfully applied to the Atlantis OBS nodes data.


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