Abstract:Zero-phase seismic data has the advantages of high resolution and easy interpretation. However, the deconvolution processing under the assumption of minimum phase is difficult to ensure that the seismic data is zero-phase, so it is necessary to estimate the residual phase through subsequent technical means for zero-phase correction. By studying the phase-shift characteristics of Ricker wavelet, it is found that there is a time difference at the peak time of Ricker wavelet with different dominant frequencies after rotating the same phase, which has a linear relationship with phase rotation. Under the assumption of constant phase, the seismic data with unknown phase are filtered twice, and the time difference of the same reflecting interface is calculated based on the filtered data. Then the phase estimation is realized by the linear relationship between the time difference and the phase. This method is free from the restriction of discriminant criterion. The feasibility and effectiveness of the method have been verified by synthetic records and real data.
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