Near-surface conditions and source variability generate surface-consistent changes in amplitudes that need to be corrected in processing. Typical amplitude compensation methods are sensitive to surface-consistent noise since prestack RMS amplitudes are used for the estimation of signal amplitude. TGS’ method is much less sensitive to the effects of noise since estimates of signal amplitude are obtained from crosscorrelations of prestack traces with stacked traces.

Vertical bands of high and low amplitudes on CDP, source and receiver stacks indicate that amplitude compensation is required. TGS is able to remove these vertical bands of amplitude from the data, as illustrated in the following receiver stacks before and after correction.

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Before SCORE
SC Amplitude after