Diffraction Multiple Wave Suppression Method Based on Wavefield Decomposition

A wave field decomposition and multiple wave technology, applied in seismology, instruments, measurement devices, etc., can solve the problem of inability to accurately predict the multiple wave model subtraction process, complexity, etc., to reduce complexity and improve robustness , the effect of reducing difficulty

Active Publication Date: 2022-05-27
ZHANJIANG BRANCH OF CHINA NATIONAL OFFSHORE OIL CORP
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Problems solved by technology

[0004] The purpose of the present invention is to provide a diffraction multiple wave suppression method based on wave field decomposition, by improving the conventional SRME method, to overcome the inability to accurately predict the multiple wave model and subtracting Disadvantages of extremely complicated process

Method used

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  • Diffraction Multiple Wave Suppression Method Based on Wavefield Decomposition
  • Diffraction Multiple Wave Suppression Method Based on Wavefield Decomposition
  • Diffraction Multiple Wave Suppression Method Based on Wavefield Decomposition

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Embodiment

[0062] a, the original seismic data is to use the measured data in a certain area: comprise 600 shot data altogether, each shot 480 tracks, every track 2000 sampling points, sampling interval 2ms; The original seismic data is arranged into the data matrix of total shot point record;

[0063] b. Perform linear Radon transformation on the data records of each common shot point;

[0064] c. Rearrange according to the reflection coefficient, and obtain plane wave data incident at different angles (co-p profile), in which in the co-p profile, the reflected wave is approximately linear continuous, while the diffracted wave is approximately hyperbolic ;

[0065] d. Select a time window of an appropriate size. The size of the time window is related to the data dimension, generally 10%-50% of the data dimension. In this example, 500*50; the seismic data of the extracted section will be transformed by fast Fourier transform (FFT transform) Map the data to the f-x domain to obtain the r...

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Abstract

The present invention involves a multi -wave suppression method based on the decomposition of the wave field. The seismic data is arranged to the concentration form of the concentration and the linear pulled winter transformation.The graphic wave data of the incident is separated from the difference between the reflection and the dextering of the same phase shaft according to the graphic wave incident.The form of the Taoism and reflecting the winter transformation, obtaining the separation wave field data and the reflection wave field data, subtracting the separated data from multiple wave prediction methods, and obtaining multiple waves of earthquake data.This method does not require the types of multiple waves in the original data. It can effectively distinguish the multiple waves of different types of waves, and the hierarchical multiple wave prediction results have been greatly improved, which improves the robustness of multiple wave suppression results, and reduces the robustness of multiple wave suppression results.The complexity of the predictive model and the difficulty of subsequent waves of subsequent waves.

Description

technical field [0001] The invention belongs to the technical field of geophysical signal processing, and in particular relates to a method for suppressing multiple waves, in particular to a method for suppressing diffraction multiple waves based on wave field decomposition. Background technique [0002] In recent years, offshore oil and gas exploration has developed rapidly. Seismic exploration is the main method of offshore oil and gas exploration, and the problem of multiple waves has always been the first major problem in marine seismic exploration. Multiple waves in seismic data are regular interference waves. When multiple waves and effective waves appear at the same travel time position, especially in deep water data, multiple waves with stronger energy will even cover deep effective waves. , interfere with the effective wave. The intersecting events seriously affect the quality of seismic sections, making it difficult to identify deep structures, and make subsequent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V1/364G01V2210/32G01V2210/324G01V2210/45G01V2210/46
Inventor 谢玉洪李列欧阳敏张迎朝袁全社李林盖永浩王大为杨文博邓聪吴涛邱宇
Owner ZHANJIANG BRANCH OF CHINA NATIONAL OFFSHORE OIL CORP
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