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3-dimensional migration of irregular grids of 2-dimensional seismic data

  • US 5,079,703 A
  • Filed: 02/20/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 02/20/1990
  • Status: Expired due to Term
First Claim
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1. A method for deriving a three-dimensional seismic image from two-dimensional seismic data arranged according to a plurality of shot lines in a survey area, comprising the steps of:

  • representing said seismic data in a representation which corresponds to the spatial relationship of the shot lines in the survey area;

    for each portion of said seismic data corresponding to each of said shot lines, performing a two-dimensional migration thereof to generate migrated seismic data in the form of a plurality of migrated traces corresponding to each shot line;

    selecting a plurality of image points in said representation, said image points corresponding to points in said survey area;

    for each of said selected image points, performing the substeps of;

    selecting the migrated trace for each of said plurality of migrated shot lines that is closest to the image point in said representation; and

    for each selected migrated trace, performing a migration with respect to the image point; and

    forming a migrated three-dimensional image using the results of said migrations of said selected migrated traces with respect to said image points.

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