A Method and Device for Wavelet Stretching Correction of Seismic Gauge Based on Multi-Wavelet Decomposition

Abstract

The invention discloses a seismic trace set wavelet stretch correction method and device based on multi-wavelet decomposition. Firstly, a reference trace is selected; Fourier transform is used to calculate the peak frequency of the reference trace and each trace to be corrected; the reference trace and the trace to be corrected are decomposed. For each track to be corrected, search for the best wavelet of the reference track and each track to be corrected; use the best wavelet of the reference track to perform stretch correction on the best wavelet of each track to be corrected; The Jia wavelet is reconstructed to obtain the stretch-corrected seismic gather. The invention completely eliminates the stretching phenomenon, makes the main frequency of each channel basically the same, recovers the high-frequency components of large angle and large offset and maintains the amplitude to the greatest extent, and provides accurate analysis for the subsequent analysis of the change of the amplitude with the offset. amplitude information.

Description

technical field [0001] The invention relates to the technical field of oil and gas resource exploration, in particular to a seismic gather wavelet stretch correction method and device based on multi-wavelet decomposition. Background technique [0002] In the process of seismic data processing, both motion correction and migration processing will cause wavelet stretching at large angles and large offsets. Wavelet stretching will reduce the main frequency and resolution of seismic data, which is not conducive to seismic amplitude migration This greatly affects the accuracy of pre-stack parameter inversion and post-stack interpretation. Therefore, the correction or elimination of wavelet stretching is of great significance in oil and gas exploration. [0003] Wavelet stretching includes two types: offset stretching and dynamic correction stretching. Offset stretching is a waveform stretching phenomenon caused by comparing the input ray time interval to the same vertical space ...

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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