The Gaussian beam is the solution of paraxial approximation equation achieved in ray-centered coordinate.The Gaussian beam
depth migration (GBM) contains the single Gaussian beam solution and the imaging stack by all Gaussian beams.The single
Gaussian beam is obtained in two steps,including kinematical ray tracing to get ray-path & traveling-time of central ray and
dynamic ray tracing to get high-frequency energy near central ray.Wavefield propagation characterization by using
independently-individual Gaussian beam preserves the kinematical characteristics while it keeps the dynamic characteristics of
wavefield.By utilizing the independently-individual Gaussian beam for imaging stack,GBM can solve the multi-path problem for
ray-tracing methods;meanwhile,it is characterized by the flexibility of first-arrival Kirchhoff integral migration and the accuracy
of wave equation migration.In addition,GBM isn’t restricted by dip,while avoids the static correction problem and improves
the imaging accuracy in rugged topography.Theoretical model and actual data proved the effectiveness and advantages of the
technique.
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