Method for depth-frequency analysis of Rayleigh surface waves

A Rayleigh surface wave and frequency analysis technology, applied in the field of Rayleigh surface wave depth-frequency analysis, which can solve problems such as limited information and affecting Rayleigh surface waves.

Inactive Publication Date: 2014-07-09
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

In fact, the hidden information in the Rayleigh surface wave is very rich. Since this method only establishes the relationship between the propagation velocity of the Rayleigh surface wave and the wavelength, the obtained information is limited, which affects the ability of the Rayleigh surface wave to solve practical geological problems. ability

Method used

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  • Method for depth-frequency analysis of Rayleigh surface waves
  • Method for depth-frequency analysis of Rayleigh surface waves
  • Method for depth-frequency analysis of Rayleigh surface waves

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Embodiment

[0054] Taking an actual single-shot surface wave seismic record with 100 traces, 1000 sampling points per trace, and a time sampling rate of 4ms as an example to illustrate the implementation steps of this example:

[0055] The first step is to read the single-shot Rayleigh surface wave seismic records with 100 traces, each trace has 1000 sampling points, and the time sampling rate is 4ms into a two-dimensional array g middle;

[0056] second step, yes g Perform a two-dimensional Fourier transform to get f-k spectrum; the two-dimensional discrete Fourier transform is:

[0057]

[0058]

[0059]

[0060]

[0061]

[0062] in, k is the wave number, is the wavenumber sampling rate, j 0 =1, 2, ..., 100, is the wave number sampling serial number; f is the frequency, is the frequency sampling rate, l 0 =1, 2, ..., 1000, is the frequency sampling number; j =1, 2, ..., 100, is the track number; l= 1, 2, ..., 1000, is the sampling point serial number; is ...

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Abstract

A Rayleigh surface wave depth-frequency analysis method, the steps are: 1. Read the single-shot Rayleigh surface wave seismic record containing m channels, each channel has n sampling points, and the time sampling rate into a two-dimensional array g middle; second, perform two-dimensional Fourier transform on g to obtain f-k spectrum; third, establish penetration depth (h) and velocity (v), frequency (f), wave number (k), wavelength (λ), Poisson Ratio (σ); the fourth step, according to Rayleigh surface wave penetration depth (h) and velocity (v), frequency (f), wave number (k), wavelength (λ), Poisson's ratio (σ ), map the energy corresponding to the (k, f) coordinate in the f-k spectrum to the position corresponding to the (f, h) coordinate in the h-f spectrum, select the coordinate range of the h-f spectrum output and make a graph; the fifth step, Based on the h-f spectrum, the strong energy clusters in the h-f spectrum are picked up sequentially from shallow to deep, and the corresponding (f, h) coordinate values ​​are extracted to form a depth-frequency (h-f) curve. Information extraction is simple and convenient.

Description

technical field [0001] The invention belongs to the field of seismic Rayleigh surface wave velocity parameter extraction, in particular to a Rayleigh surface wave depth-frequency analysis method. Background technique [0002] Rayleigh surface wave is a very effective seismic exploration method in the study of the earth's internal structure and various engineering exploration problems near the surface, especially in the acquisition of near-surface strata structure and attribute characteristics. Due to the dispersion characteristics of Rayleigh waves, the existing methods are mainly based on f-k Rayleigh surface wave dispersion curves are extracted from the spectrum, and the corresponding formation structure, structure and other information can be extracted according to the characteristics of the dispersion curves. In fact, the hidden information in the Rayleigh surface wave is very rich. Since this method only establishes the relationship between the propagation velocity of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 沈鸿雁赵晓奇胡桢干李朋波刘建杰
Owner XI'AN PETROLEUM UNIVERSITY
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