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

A correction method and seismic gather technology, applied in the field of oil and gas resource exploration, can solve the problems of affecting the correctness of the amplitude, the inability to completely eliminate the stretching, the correction of the amplitude, and the lack of solutions, etc., to achieve the effect of improving the resolution

Active Publication Date: 2018-09-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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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Embodiment Construction

[0055] The present invention will be further described below with reference to the drawings and embodiments.

[0056] It should be pointed out that the following detailed descriptions are all illustrative and are intended to provide further explanations for the application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0057] It should be noted that the terms used here are only for describing specific implementations, and are not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate There are features, steps, operations, devices,...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36
Inventor 张繁昌兰南英桑凯恒张佳佳梁锴
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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