Seismic channel set wavelet stretching correction method and device based on multi-wavelet decomposition

Abstract

The invention discloses a seismic channel set wavelet stretching correction method and device based on multi-wavelet decomposition. Reference channels are selected first; Fourier transformation is utilized to calculate the peak frequency of the reference channels and channels to be corrected; the reference channels and channels to be corrected are decomposed, and best wavelets are of the referencechannels and channels to be corrected are searched; the best wavelets of the reference channels are utilized to conduct stretching correction on the best wavelets of the channels to be corrected; thebest wavelets undergoing stretching correction are re-constructed to obtain a seismic channel set undergoing stretching correction. By adopting the seismic channel set wavelet stretching correction method and device, a stretching phenomenon is completely eliminated, the main frequencies of the channels are basically consistent, large-angle and large-offset radio-frequency components and amplitude-preserving processing are restored to the most degree, and accurate amplitude information is provided for analysis on follow-up amplitude change with amplitude offset.

Description

Technical field [0001] The invention relates to the technical field of oil and gas resource exploration, in particular to a seismic gather wavelet stretching correction method and device based on multiwavelet decomposition. Background technique [0002] In the process of seismic data processing, both dynamic correction and migration processing will cause the wavelet stretching phenomenon at large angles and cannon offsets. The wavelet stretching phenomenon reduces the main frequency and resolution of the seismic data, which is not conducive to the migration of the seismic amplitude. The analysis of distance changes greatly affects the accuracy of pre-stack parameter inversion and post-stack interpretation. Therefore, the correction or elimination of the wavelet stretching phenomenon is extremely important in oil and gas exploration. [0003] Wavelet stretching includes two types: offset stretching and dynamic correction stretching. The offset stretching is the waveform stretching ...

AI Technical Summary

Problems solved by technology

However, this method has the following two problems: 1. Accurate angle information is often not obtained in actual processing; 2. Harmonic effects often occur in the process of using the stretch factor to transform the spectrum, resulting in that the corrected seismic trace cannot maintain the amplitude Unaltered, will destroy the amplitude vs. offset effect

However, due to the technical problems that the existing wavelet stretching correction method cannot realize the complete elimination of stretching and amplitude preservation correction, it will still affect the correctness of the attribute extraction of amplitude changing with offset

[0005] To sum up, in the prior art, there is still no effective solution to the problem that the complete elimination of stretching and amplitude preservation correction cannot be realized

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