1. Oversea Business Department, Geophysical Research Institute, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 2. Geological Research Center, Geophysical Research Institute, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：With the popularization of “wide azimuth，wide frequency band and high density” seismic acquisition and processing technique，rich dip and azimuth information about wave fields such as reflection waves，diffraction waves，and diving waves is retained in full-azimuth dip gathers generated by pre-stack depth migration of local angle domain. The different seismic wave fields are easier to identify and distinguish in the full-azimuth dip gathers，laying a foundation for the pre-stack reflection wave field separation and imaging. In the full-azimuth dip gather modeled by the theoretical model，the reflection energy is significantly stronger than the energy of other wave fields，and there are kinematic differences between reflection waves and diffraction waves. Based on this，the processing workflow of reflection wave separation from actual full-azimuth dip gathers is formulated. Then，the pre-stack full-azimuth dip gather after wave field separation is superimposed to improve the imaging quality of the target area by reflection stacking and imaging. The method has been applied to 3D actual data in Kazakhstan，and the results show that the fault imaging of the western fractured zone in the exploration area is clearer to notably improve the imaging quality by the proposed technology，which lays a foundation for fine structure interpretation and geological research in this area.
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