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System and method for eliminating random noise in seismic signals

A random noise and seismic signal technology, applied in the direction of seismic signal processing, etc., can solve the problem that the random noise of seismic signal cannot be eliminated, and achieve the effect of widening the frequency band and improving the resolution

Inactive Publication Date: 2018-02-27
YANGTZE UNIVERSITY
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Problems solved by technology

[0006] In order to solve the problem that the existing techniques for improving the resolution of seismic data cannot eliminate the random noise in the seismic signal, it is necessary to provide a system and method for eliminating the random noise in the seismic signal

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  • System and method for eliminating random noise in seismic signals
  • System and method for eliminating random noise in seismic signals
  • System and method for eliminating random noise in seismic signals

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Embodiment Construction

[0029] Such as figure 1 As shown, a system for eliminating random noise in seismic signals includes the following units:

[0030] The curvelet transform unit is used to read the original seismic signal data, and perform curvelet transform decomposition on the original seismic signal data to obtain the first frequency subband and the representation The second frequency subband of the spatial features of the image, wherein the frequency range of the first frequency subband is 10-20Hz, representing different geological components for the seismic section, and the frequency range of the second frequency subband is 50-200Hz, representing the details part.

[0031] Since there are many limitations in analyzing seismic signals in the spatial domain for noise suppression and frequency band expansion, the embodiments of the present invention project the seismic signals in the spatial domain to the curvelet domain through curvelet transform, and there are many problems in the curvelet d...

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Abstract

The present invention provides a system for eliminating random noise in seismic signals, which includes the following units: a curvelet transform unit, which is used to read the original seismic signal data, and decompose the curvelet transform to obtain the first frequency subunits in each scale and direction in the curvelet domain. The band and the second frequency sub-band; the threshold optimization unit is used to determine the threshold of the curvelet coefficient in different scales and different directions; and obtain the optimal threshold that makes the generalized cross-validation criterion risk assessment function have a minimum value through the genetic algorithm; the threshold is removed The noise unit is used to perform threshold denoising on the first frequency sub-band and the second frequency sub-band obtained by decomposition; the filter design unit is used to design different adaptive spectral whitening filters; the spectral whitening processing unit is used for processing Effective signals of different scales and directions in the first frequency sub-band and the second frequency sub-band are spectrally whitened; the curvelet inverse transformation unit is used for reconstruction through the curvelet inverse transformation to obtain denoised and improved resolution Earthquake signal data.

Description

technical field [0001] The invention relates to the technical field of seismic signal denoising, in particular to a system and method for eliminating random noise in seismic signals. Background technique [0002] As the main energy source in today's society, oil and gas resources continue to promote human progress, and people's growing demand for oil and gas energy puts forward higher requirements for oil and gas exploration. However, with the continuous deepening of exploration, the difficulty of exploration is also increasing, mainly reflected in the exploration of hidden oil and gas reservoirs with complex structures and difficult to identify seismic profile features. Therefore, the signal is denoised and the resolution of seismic data is improved. It is of great significance to the exploration and development of subtle oil and gas reservoirs with small area but capable of increasing reserves and production. [0003] Aiming at the problem of improving the resolution of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 文畅
Owner YANGTZE UNIVERSITY
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