METHOD FOR PREQUENCY DOMAIN SEISMIC DATA PROCESSING ON A MASSIVELY PARALLEL COMPUTER

摘要

A FREQUENCY DOMAIN METHOD OF PROCESSING GEOPHYSICAL DATA ON A COMPUTER HAVING MASSIVELY PARALLEL PROCESSORS. THE METHOD INVOLVES ASSIGNING DATA SLICE PARTITIONS TO EACH PROCESSOR, PRECOMPUTING A VELOCITY MODEL CORRESPONDING TO THE GEOPHYSICAL DATA, AND MIGRATING THE DATA ON EACH SLICE WITHIN EACH PROCESSOR USING A ONE-PASS, SPLIT WAVE EQUATION FINITE DIFFERENCE TECHNIQUE FOR DEPTH MIGRATION AND EITHER PHASE SHIFT OR RECURSIVE TECHNIQUES FOR TIME MIGRATION. A SEQUENCE OF TRANSFORMS AND TRANSPOSITIONS BETWEEN PROCESSORS ASSIGNED PARTITIONS ON EACH FREQUENCY SLICE TRANSFORMS THE DATA INTO THE FREQUENCY-WAVENUMBER DOMAIN AND ALLOWS THE MIGRATION CALCULATIONS TO BE DIRECTLY PERFORMED BY EACH PROCESSOR TO BE INDEPENDENT OF EACH OTHER PROCESSOR. THE TRANSFORMS AND TRANSPOSES ALSO ALLOW FOR DEPTH MIGRATION ERROR CORRECTION AND FILTERING IN THE FREQUENCY-WAVENUMBER DOMAIN.