| 摘要 |
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. 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: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. Suitable forward and reverse Radon transformations incorporating an offset weighting factor x<n >and its inverse p<n>, where 0<n<1, include the following continuous transform equations, and discrete versions thereof that approximate the continuous transform equations:
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