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Diffraction imaging using shot and opening-angle gathers:A prestack time migration approach

Jianfeng Zhang  Jiangjie Zhang  
【摘要】:We have developed a migration scheme that can image weak diffractions in time.This significantly contributes to conventional interpretation in detecting small-scale faults and heterogeneities.The proposed scheme images diffractions using the shot and opening-angle gathers generated by prestack time migration(PSTM).Here,the shot and opening-angle gather represents a 2D migrated gather in terms of shot locations and opening angles between the incident- and scattered-rays.We muted the Fresnel zones related to reflections,corrected phases of diffractions,and enhanced diffractions in the migrated gathers.As a result,the proposed diffraction PSTM can image diffractions with and without phase-reversal.Moreover,the weak diffractions tangent to reflections can be clearly imaged.Diffraction PSTM can update migration velocities according to behaviors of reflection and diffraction events in the migrated gathers by scanning,thus overcoming a crucial problem in diffraction imaging.The reflector dips used in diffraction PSTM are obtained by picking the angles related to reflections in the shot and opening-angle gathers for a partial migration.Synthetic and field data tests demonstrate the validity of diffraction PSTM.

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