Abstract: With the fast development of multi-component digital seismograph and the improvement of acquisition methods, 3D converted wave seismic exploration tends to be more and more applied to global oil-gas exploration. However, most of real effects are almost all less than those by theoretical expectations. One important reason is that the 3D converted wave processing is to be improved for it does not allow to be processed by conventional P-wave technique. This paper presents the research of this 3D converted wave processing technique by the wide-azimuth 3D and 3-component data from Xinchang area, including coordinate rotation from acquired coordinate to processing coordinate, vector filter for denoise based on non-correlation between the signals and the noises, structural time-controlling converted wave static correction, four-parameter anisotropic velocity analysis and converted wave pre-stack Kirchhoff time migration techniques. Following processing by these techniques, the pre-stack time migration-stack profiles are clearer in imaging, more accurate in location, better in geological configuration and more accordant with the P-wave profiles in structure.

Key words: 3D converted wave, static correction, anisotropy, pre-stack migration, Xinchang area