Abstract：Generalized screen propagators(GSP)can be considered to be super-wide-angle one-way propagators with implementation in dual domains,which neglect reverberations between heterogeneities but correctly handle the forward multiple scattering,including focusing/defocusing,diffraction,refraction and interference of waves.Due to the recent progress in the domain,new versions of dual-domain methods can calculate propagating of large-angle waves quite accurately in strong velocity contrast media,resulting in superior image quality (high resolution/high fidelity) economically and efficiently for complex geological regions.In the article,advantages and limitations of the traditional Kirchhoff migration and time-space domain finite difference migration when applied to 3-D complicated structures,are first analyzed.Then a brief history,principle and methodology,features and applications of GSP are given.Two versions of GSP,i.e.the hybrid pseudo-screen propagator and the wide-angle Padé-screen propagator are presented.some examples of 2-D and 3-D migration imaging and modeling using GSP method are given.
