Converted-wave common azimuth migration: Real data results

Daniel A. Rosales, Robert G. Clapp, and Biondo L. Biondi

daniel@sep.stanford.edu, bob@sep.stanford.edu, biondo@sep.stanford.edu

ABSTRACT

The converted-wave common-azimuth migration operator (PS-CAM) and the single mode common-azimuth migration operator share the advantage that they need a 3-D prestack cube of data with four dimensions ($t, {\rm cmp}_x, {\rm cmp}_y,h_x$), instead of the entire five dimensions ($t, {\rm cmp}_x, {\rm cmp}_y,h_x,h_y$). The five dimensions can be reduced to four dimensions through different processes. This paper compares two images of the PS data set from the OBS acquisition on the Alba oil field in the North sea. The two images correspond to the following processes: 1. The common-azimuth migration of the data regularized using Normal Moveout. 2. The common-azimuth migration of the data regularized using PS Azimuth Moveout. The final results show that the image from the data regularized using PS Azimuth Moveout is significantly better than the images obtained the image from the data regularized using Normal Moveout.