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A method for extracting dispersion curve of mine channel wave two-component seismic signal

An extraction method and seismic signal 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 fundamental mode, so as to improve the accuracy and dispersion Feature Precise Effects

Active Publication Date: 2017-09-15
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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  • A method for extracting dispersion curve of mine channel wave two-component seismic signal
  • A method for extracting dispersion curve of mine channel wave two-component seismic signal
  • A method for extracting dispersion curve of mine channel wave two-component seismic signal

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Embodiment 1

[0036] In this embodiment, the Love-type channel wave signal is firstly obtained from the channel-wave dual-component seismic signal; and then the obtained Love-type channel wave signal is subjected to generalized S-transformation to obtain a relationship diagram of Love-type channel wave group velocity and frequency; Connect the amplitude maxima in the obtained group velocity versus frequency graph, and the resulting curve is the desired dispersion curve. The specific implementation process of this method is as follows.

[0037] 1. Obtain Love-type channel wave signals from channel wave dual-component seismic signals.

[0038] Channel waves are divided into two types: Love-type channel waves and Rayleigh-type channel waves. Development, the present invention is aimed at the extraction of the Loew channel wave dispersion curve. For the simple three-layer theoretical model of roof-coal seam-floor, if the excitation is in the center of the coal seam, since the seismic wave vel...

Embodiment 2

[0070] Due to the unclear relationship between the particle vibration orientation and wave propagation direction in the original acquisition signal, the acquisition signal contains many types of seismic waves, resulting in the dispersion pattern is not obvious in the dispersion diagram, and the energy maximum value connection line is divergent and discontinuous. For this reason, on the basis of Embodiment 1, the present invention has carried out further improvement, before carrying out generalized S transformation to the slot wave signal, the two-component slot wave signal obtained is respectively converted to the horizontal parallel wave propagation direction and the horizontal vertical wave propagation direction Direction, so as to obtain the Love-type channel wave signal of the particles vibrating horizontally in the vertical wave propagation direction, and then calculate the dispersion to obtain the Love-type channel wave dispersion curve. The process of coordinate conversi...

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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 mine channel wave double-component seismic signal, belonging to the technical field of seismic signal processing. Background technique [0002] With the domestic promotion of the channel wave seismograph of German DMT company in 2010, mine channel wave seismic exploration technology has developed rapidly, and many domestic coal mines have actively carried out related application research. Dispersion is the most obvious characteristic of channel wave seismic signals, that is, the propagation speed of channel waves is a function of frequency, which is produced under the condition of the unique lithology combination "roof-coal seam-floor" in mines. The dispersion characteristics of channel wave signal include surrounding rock, coal seam velocity and structure information. According to the channel wave dispersion characteristics of coal seams with different thicknesses, scientific re...

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Application Information

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Patent Type & Authority Patents(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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