G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 1/32 (2006.01)
Patent
CA 2568113
Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. The seismic data is transformed from the offset-time domain to the time-slowness domain using a Radon transformation. Preferably, the Radon transformation is applied within defined slowness limits p min and p max, where p min is a predetermined minimum slowness and p max is a predetermined maximum slowness, and an offset weighting factor x n is applied to the amplitude data, wherein 0 < n < 1. A high resolution Radon transformation preferably is used, where the transformation is performed according to an index j of the slowness set and a sampling variable .DELTA.p; wherein (see formula I) .DELTA.p is from about 0.5 to about 4.0 µsec/m, p max is a predetermined maximum slowness, and p min is a predetermined minimum slowness. A high-low, preferably a time variant, high low corrective filter is then applied to enhance the primary reflection signal content of the data and to eliminate unwanted noise events. The tau-P filter is defined by reference to the velocity function of the primary reflection signals, and preferably is expressed as: (see formula II) where r1 and r2 are percentages expressed as decimals. The slowness limits typically are set within ~ 15% of the velocity function, and r1 and r2 may be set accordingly. After filtering, the enhanced signal content is inverse transformed from the time-slowness domain back to the offset-time domain using an inverse Radon transformation.
Robinson John M.
Smart & Biggar
LandOfFree
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