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Robust estimation method for determining when subsequent data processing can include sign-bit representations of full-waveform seismic traces
Robust estimation method for determining when subsequent data processing can include sign-bit representations of full-waveform seismic traces
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机译:用于确定后续数据处理何时可以包括全波形地震道的符号位表示的鲁棒估计方法
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摘要
A method is disclosed for determining if sign-clipped variations of full-waveform traces can be used in subsequent cross- correlation processing without undue hardship. In accordance with one aspect, the present invention examines skewness of the amplitude spectrum of the full waveform. If the former significantly differs from conventional Gaussian distribution over the frequency range of interest, i.e., the amplitude spectrum is non-Gaussian, sign-clipped versions thereof can be used in subsequent cross-correlation processing without undue loss in processing accuracy. In another aspect, the present invention is used to edit a series of traces, one at a time, gathered by a large multichannel collection system. In this aspect, the different spectral noise estimates, including cross-correlation estimates generated from sign-clipped versions of the full-waveform traces, are advantageously used.
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