Multi-component seismic surface wave exploration method

Abstract

The invention belongs to the field of near-surface seismic exploration, and particularly relates to a multi-component seismic surface wave exploration method, which comprises the steps of 1, designingmulti-component surface wave exploration observation system parameters including a survey line position, a channel spacing dx, a sampling rate t, a sampling length T, an arrangement length L and a minimum offset x1 in combination with the actual situation of a research area, 2, acquiring multi-component surface wave seismic data in a rolling manner, 3, extracting Z-component seismic data in the single-shot seismic record, 4, performing damping least square inversion on the extracted Z component frequency dispersion curve f-vRZij, 5, extracting H-component seismic data in the single-shot seismic record, performing wave field transformation on the H-component seismic record, and extracting an H-component frequency dispersion curve f-vRHij, and 6, taking Xz(vS, h) as an initial model for theextracted H component frequency dispersion curve, and performing iterative inversion by referring to the step 4 to obtain a final stratum inversion result XH(vS, h).

Description

technical field [0001] The invention belongs to the field of near-surface seismic exploration, and in particular relates to a multi-component seismic surface wave exploration method. Background technique [0002] In multi-component seismic exploration, three-component geophones are used to obtain the fluctuation information of the X, Y, and Z directions when the wave propagates in the medium. The seismic records thus obtained contain more abundant geological information of the underground medium, which is helpful for improving The signal-to-noise ratio and resolution of seismic records play an important role. This method has been effectively applied in reflection seismic, but it is more practical for multi-channel transient surface wave exploration, because Rayleigh waves travel in an inverse ellipse near the medium interface. The form propagates forward, and its energy is unequally distributed in the X and Z components, while the predecessors only used the Z component seism...

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Problems solved by technology

[0002] In multi-component seismic exploration, three-component geophones are used to obtain the fluctuation information of the X, Y, and Z directions when the wave propagates in the medium. The seismic records thus obtained contain more abundant geological information of the underground medium, which is helpful for improving The signal-to-noise ratio and resolution of seismic records play an important role. This method has been effectively applied in reflection seismic, but it is more practical for multi-channel transient surface wave exploration, because Rayleigh waves travel in an inverse ellipse near the medium interface. The form propagates forward, and its energy is unequally distributed in the X and Z components, while the predecessors only used the Z component seismic records for dispersion imaging and inversion, due to factors such as random noise, near-field effects and P waveguide waves It is difficult to effectively identify and separate the Rayleigh waves of each order mode in the spectrogram, and even cannot be realized. If the H component information is combined with mutual constraints, the above problems can be effectively alleviated, and the H component seismic signal attenuates faster and has a better High-speed high-order Rayleigh waves are more prominent in certain frequency bands than the fundamental-order modes in the H-component spectrum diagram. Therefore, it is necessary to design and study a multi-component seismic surface wave exploration method for multi-component seismic surface wave exploration, which can be combined with Dispersion imaging and inversion of the seismic surface wave information of the two components of X and Z to improve the accuracy of picking up the dispersion curve and the accuracy of the inversion results

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