3-D Prestack Migration: Two Implementations , by John T. Etgen

Two techniques for prestack migration in two dimensions, the finite-difference reverse-time method and the Kirchhoff integral method, can be used for prestack migration in three dimensions. Because of the tremendous amount of data present in a 3-D survey, the migrations are posed as individual shot profile migrations. If the data for one field profile are collected on an x,y grid (areal data) then the reverse-time prestack migration is an appropriate method for 3-D prestack migration. This is most common for high-resolution 3-D land surveys. If the data for one field profile are collected only along a line, then the Kirchhoff integral method is appropriate. Non-uniform spatial sampling is more easily accommodated by the Kirchhoff integral method.


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