| 摘要 |
METHOD OF DETERMINING THE VELOCITY V AND ANELLIPTICITY n PARAMETERS FOR PROCESSING SEISMIC TRACES IN A COMMON MIDPOINT (CMP) GATHER INCLUDING AN ANELLIPTIC NMO CORRECTION, CHARACTERISED IN THAT IT COMPRISES: - A PRELIMINARY STEP TO DEFINE A PLURALITY OF NODES (DTN, t0), THE SAID NODES BEING INDICATIVE OF PARAMETERS DTN AND t0 REPRESENTING THE NMO CORRECTION FOR THE MAXIMUM OFFSET AND THE ZERO OFFSET TRAVEL TIME IN HYPERBOLIC COORDINATES, THE SAID PRELIMINARY STEP BEING FOLLOWED BY - FOR EACH NODE (DTN, t0) DEFINED IN THE PRELIMINARY STEP, THE FOLLOWING STEPS:- FOR STATIC NMO CORRECTION OF TRACES IN THE CMP GATHER AS A FUNCTION OF THE VALUES OF THE SAID PARAMETERS DTN AND t0 AT THE NODE CONSIDERED, AND CALCULATION OF THE SEMBLANCE FUNCTION ASSOCIATED WITH THE SAID NMO CORRECTION FOR THE NODE CONSIDERED; AND -FOR EACH PICKED TIME t0, A STEP INCLUDING DETERMINATION OF THE MAXIMUM SEMBLANCE NODE (DTN(t0), t0(t0),- AND A FINAL STEP TO CONVERT THE DTN(t0) AND t0 (t0) PARAMETERS SO AS TO OBTAIN THE VELOCITY V(t0) AND ANELLEPTICITY n(t0) LAWS.
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