An iterative procedure has been developed involving two-dimensional (2D) velocity estimation followed by reflection point migration to model the velocity field and reflector locations from seismic reflection data. The method utilizes traveltimes picked from prestack seismic reflection data. At each iterative step the velocity field is obtained by a tomographic inversion procedure. The reflector locations are determined according to the location of reflection points migrated using the current velocity field. The process of reflection point migration is sufficiently fast that reflector location may be performed using an interactive graphics routine on a modern microcomputer or work station. The model can readily be constrained using a priori information at any stage. A clear appreciation is obtained of any ambiguity between the velocity field and reflector geometry that may be inherent in the data. An example is shown of the application of the method to a marine seismie reflection data set from the North Sea.
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Dyer et al. (1988) studied this question.