A false frequency surface wave extraction method and system
An extraction method and surface wave technology, applied in the field of false frequency surface wave extraction method and system, can solve the problem that low-pass frequency filtering cannot work, it is difficult to effectively separate false frequency surface wave and body wave field, and seismic data processing cannot be guaranteed Quality and other issues
Active Publication Date: 2021-04-20
CHINA UNIV OF GEOSCIENCES (BEIJING)
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In addition, for seismic records containing aliased surface waves, due to the large track spacing between adjacent geophones, the sampling rate of aliased surface waves in the spatial direction is insufficient, resulting in the aliased surface wave energy appearing on the negative frequency axis, Low-pass frequency filtering cannot act on negative frequency wave fields, that is, it is difficult for conventional filtering methods to effectively separate false frequency surface waves from body wave fields
The false frequency surface wave and the body wave field cannot be effectively separated, resulting in low accuracy in the processing of false frequency surface waves in oil and gas fields separated by avenues, and unable to provide high-quality shot data for seismic stacking and migration, that is, the quality of seismic data processing cannot be guaranteed
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0051] The purpose of the present invention is to provide a method and system for extracting false frequency surface waves, improve the processing accuracy of false frequency surface waves in oil and gas fields with intervals between highways, provide high-quality shot data for seismic stacking and migration, and improve the quality of seismic data processing.
[0052] In order to make the above objects, features and advantages of the present invention more com...
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The invention relates to a false frequency surface wave extraction method and system. The method includes: obtaining acquisition parameters and three-dimensional azimuth gathers containing false surface wave frequency gun records; according to the acquisition parameters and the three-dimensional azimuth gather, using the azimuth MUSIC algorithm to determine the false frequency surface wave spectrum; according to the The maximum value of the aliased surface wave spectrum determines the dispersion curve; according to the acquisition parameters of the frequency shot record containing the aliased surface wave and the dispersion curve, a phase-matched filter is used to extract the aliased surface wave. The method and system for extracting false-frequency surface waves provided by the present invention can improve the processing accuracy of false-frequency surface waves in oil and gas fields spaced apart from highways, provide high-quality shot data for seismic stacking and migration, and improve the quality of seismic data processing.
Description
technical field [0001] The invention relates to the field of false frequency surface wave extraction, in particular to a false frequency surface wave extraction method and system. Background technique [0002] Surface wave multi-scale research can realize large-scale or local area velocity structure inversion. By extracting the dispersion curves of surface waves, the researchers were able to estimate S-wave velocities, the attenuation of the Earth's medium, and gain a better understanding of geological structures. Studies have shown that although dispersion curves obtained from real data can be used to construct velocity profiles in most cases, it is difficult for researchers to obtain dispersion spectra containing spurious frequency surface waves in regions with inhomogeneous media or insufficient spatial sampling. The problem of aliased surface waves promotes the development of surface wave dispersion extraction and inversion algorithms. We need further research to explo...
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IPC IPC(8): G01V1/28G01V1/36G01V1/32
CPCG01V1/28G01V1/32G01V1/364G01V2210/43G01V2210/677
Inventor 杨春颖王赟
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)