Abstract:Seismic wavelet estimated by conventional methods is inaccurate due to earth attenuation. To solve this problem, we propose in this paper time-variant mixed-phase seismic wavelet estimation method based on spectral modeling in the time-frequency domain. First non-stationary seismic record is transformed into the time-frequency domain with the improved generalized S-transformation, and processed with time-frequency filtering. And then amplitude spectrum of time-variant wavelet is estimated using spectral modeling method. With the assumption of time-invariant wavelet phase, mixed phase is estimated by the bi-spectrum. Finally the time-variant mixed-phase seismic wavelet is estimated with the joint use of amplitude spectrum and phase spectrum. Compared with conventional sectional methods for time-variant wavelet estimation, this method can accurately estimate time-variant seismic wavelet without sectional stationary wavelet even in the case of big wavelet change in adjacent strata. Theoretical analysis and synthetic example results show that the proposed method is effective and feasible.
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