Dispersion curve extracting method for mine channel wave double-component seismic signal

A seismic signal and dispersion curve technology, applied in seismic signal processing, seismology, measuring devices, etc., can solve the problems of poor calculation effect and result error of the dispersion curve in the low frequency band of the basic mode, and achieve improved accuracy, frequency, etc. Accurate effect of scattered features

Active Publication Date: 2016-07-20
HENAN POLYTECHNIC UNIV
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Problems solved by technology

The f-k transformation method requires the data sampling intervals in the space and time domains to be equal. If the sampled data has bad sectors, it will cause a large error in the result. The τ-p transformation method has a better calculation effect on the high-order The calculation effect of the dispersion curve in the low frequency band of the first mode is poor

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  • Dispersion curve extracting method for mine channel wave double-component seismic signal
  • Dispersion curve extracting method for mine channel wave double-component seismic signal
  • Dispersion curve extracting method for mine channel wave double-component seismic signal

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Embodiment 1

[0036] This embodiment first obtains the Love-shaped groove wave signal from the two-component seismic signal of the groove wave; then performs the generalized S transform on the obtained Love-shaped groove wave signal to obtain the relationship diagram between the speed and frequency of the Love-shaped groove wave group; Connect the obtained maximum amplitude values ​​in the graph of the relationship between group velocity and frequency, and the obtained curve is the desired dispersion curve. The specific implementation process of this method is as follows.

[0037] 1. Obtain the Love-shaped groove signal from the two-component seismic signal of the groove wave.

[0038] There are two types of groove waves: Love type groove waves and Rayleigh type groove waves. The seismic data of the groove waves received by the horizontal two-component geophone used in coal mines is mainly Love type groove waves. Development, the present invention is aimed at the extraction of the dispersion cu...

Embodiment 2

[0070] Due to the unclear relationship between the particle vibration position and the wave propagation direction in the original acquisition signal, the acquired signal contains multiple types of seismic waves, which results in the unobvious dispersion law in the dispersion diagram, and the energy maximum value line diverges and is not continuous. For this reason, the present invention is further improved on the basis of the first embodiment. Before the generalized S transform is performed on the slot wave signal, the obtained dual-component slot wave signal is converted into the horizontal parallel wave propagation direction and the horizontal vertical wave propagation respectively. In order to obtain the Love-shaped groove wave signal of the particle horizontally vibrating in the vertical wave propagation direction, the dispersion calculation is performed to obtain the Love-shaped groove wave dispersion curve. The process of coordinate conversion of the slot wave signal will ...

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Abstract

The invention relates to a dispersion curve extracting method for a mine channel wave double-component seismic signal. The dispersion curve extracting method comprises the steps of firstly acquiring a Love channel wave signal from the mine channel wave double-component seismic signal; performing generalized S transformation on the acquired Love channel groove signal for obtaining a relationship diaphragm between group speed and frequency of the Love channel wave; drawing a line between maximal vibration amplitudes in the relationship diaphragm between the group speed and the frequency, and utilizing the obtained curve as the dispersion curve. According to the dispersion curve extracting method, the width of a Gauss window in S transformation is changed by means of a linearly changed adjusting parameter, thereby improving precision of a channel wave signal dispersion curve. Furthermore, according to the method, before generalized S transformation, propagation direction and polarization angle of the seismic wave are determined through calculation according to an energy distribution criterion of a longitudinal wave in the acquired signal in a double-component detector. Coordinate rotation is performed for obtaining the Love channel wave signal which horizontally vibrates in the propagation direction of the vertical wave. Then dispersion calculation is performed on the signal. The dispersion characteristic of the obtained dispersion curve is more accurate.

Description

Technical field [0001] The invention relates to a method for extracting a dispersion curve of a dual-component seismic signal of a mine groove wave, and belongs to the technical field of seismic signal processing. Background technique [0002] With the promotion of the groove wave seismograph of German DMT company in China in 2010, the mine groove wave seismic exploration technology has developed rapidly, and many domestic coal mines have actively carried out related application research. Dispersion is the most obvious feature of channel wave seismic signals, that is, the propagation speed of channel wave is a function of frequency, which is generated under the conditions of the unique lithological combination "roof-coal-floor" in the mine. The channel wave signal dispersion characteristics include surrounding rock, coal seam velocity and structure information. Based on the channel wave dispersion characteristics of coal seams of different thicknesses, scientific research units ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/63
Inventor 冯磊张玉贵周明奂
Owner HENAN POLYTECHNIC UNIV
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