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Joint denoising method of coal seam hydraulic fracturing microseismic signal based on wavelet packet multiple thresholds and improved empirical mode decomposition

A technology of empirical mode decomposition and wavelet packet decomposition, applied in seismic signal processing, seismology, instruments, etc., can solve problems that are difficult to balance high resolution and adaptability, and achieve good denoising effect and strong applicability Effect

Active Publication Date: 2020-07-31
NORTH CHINA INST OF SCI & TECH
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Problems solved by technology

Based on the above analysis, it can be seen that the denoising processing of coal seam hydraulic fracturing microseismic signals cannot be carried out only in the time domain or frequency domain. HHT denoising (poor frequency domain resolution) and other methods are difficult to take into account the characteristics of high resolution and adaptability

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  • Joint denoising method of coal seam hydraulic fracturing microseismic signal based on wavelet packet multiple thresholds and improved empirical mode decomposition
  • Joint denoising method of coal seam hydraulic fracturing microseismic signal based on wavelet packet multiple thresholds and improved empirical mode decomposition
  • Joint denoising method of coal seam hydraulic fracturing microseismic signal based on wavelet packet multiple thresholds and improved empirical mode decomposition

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Embodiment Construction

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0063] The combined noise reduction method for coal seam hydraulic fracturing microseismic signals based on wavelet packet multiple thresholds and improved empirical mode decomposition provided by the present invention comprises the following steps:

[0064] Step 1: Import the coal seam hydraulic fracturing microseismic signal S(n) collected on site

[0065] Import and collect the mine coal seam hydraulic fracturing microseismic signal time series S(n), n=1, 2, ..., N, wherein N is the total number of sampling points of the coal seam hydraulic fracturing microseismic signal, and its sampling frequency is 1000Hz;

[0066] Step 2: Signal preprocessing, including signal triggering and interception, etc.;

[0067] The trigger algorithm of the signal is the improved time window en...

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Abstract

The invention discloses a coal bed hydrofracture micro-earthquake signal combined noise reduction method based on wavelet packet multithreshold and improved experience mode decomposition. The coal bedhydrofracture micro-earthquake signal combined noise reduction method based on wavelet packet multithreshold and improved experience mode decomposition comprises the following steps: step 1, guidingan acquired micro-earthquake coal and rock fracture signal time sequence S (n); step 2, preprocessing of signals: triggering and intercepting signals; step 3, carrying out wavelet packet decompositionon hydrofracture micro-earthquake signals; step 4, wavelet packet multithreshold noise reduction; step 5, carrying out improved HHT secondary noise reduction treatment; and step 6, reconstructing signals. The problem of noise reduction of hydrofracture micro-earthquake signals is solved effectively. The coal bed hydrofracture micro-earthquake signal combined noise reduction method based on wavelet packet multithreshold and improved experience mode decomposition has the characteristics of good noise reduction effect and high applicability.

Description

technical field [0001] The invention relates to the intersection field of mine safety and signal processing, in particular to a noise suppression method for low signal-to-noise ratio and low-energy coal seam hydraulic fracturing microseismic signals, which is a combination of wavelet packet multiple thresholds and improved Hilbert-Huang transform. denoising method. Background technique [0002] Rockburst disaster is one of the coal-rock dynamic disasters that seriously threaten the safe production of mines in my country. It has the characteristics of strong suddenness, short process and strong destructive power. Using hydraulic fracturing technology to carry out the prevention and control of rockburst in coal seams is the current A popular direction of punching technology. Hydraulic fracturing technology originated from the field of oil and gas exploitation, and has developed into a hot technology at present. Hydraulic fracturing technology is an important technical means to...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/32
Inventor 朱权洁
Owner NORTH CHINA INST OF SCI & TECH
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