Four-pass technique for 3-D omega-x-y migration

Li Teng and Gopal Palacharla

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ABSTRACT

This paper tests Ristow's four-pass method of 3-D migration as an improvement on the conventional two-pass finite-difference migration. The four-pass technique consists of applying the forty-five degree finite-difference operator along the inline and crossline directions and along the other two directions at forty-five degree azimuth to the inline and crossline directions. We have derived the dispersion relation and differential equations for the four-pass technique and implemented the four-pass technique. The results show that the four-pass operator is more isotropic than the two-pass one.