The local singularity of signal often carries a great deal of important information. Unlike Fourier transform, the wavelet transform has good local property in time and frequency domains, and it is suitable for analyzing the non-stationary signal. A new wavelet basis named impedance basis is proposed on the basis of the properties of impedance data in the paper, which can indicate discontinuity of impedance data in time. The wavelet transform based on impedance basis can effectively extract the information about impedance interfaces. The analysis for Marmousi impedance model and real seismic impedance data shows that the presented approach is applicable to detection of impedance interfaces. In addition, it is also beneficial to identification and interpretation of thin-bed.


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