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Method for suppressing random noise in seismic exploration based on VMD-TFPF

A VMD-TFPF and seismic exploration technology, applied in the field of seismic exploration, can solve the problems of effective signal component loss amplitude, poor suppression of random noise, attenuation, etc., to achieve enhanced spatial consistency, avoid inflexible selection, and reduce attenuation Effect

Inactive Publication Date: 2018-01-16
XI AN JIAOTONG UNIV
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Problems solved by technology

[0011] (1) Poor suppression of random noise of two-dimensional curved events such as polynomial fitting technique, median filter and VD method;
[0012] (2) The traditional TFPF method selects a fixed window length for filtering, and does not treat the noise-dominant and signal-dominant components differently, which will cause the loss of effective signal components and greatly attenuate the amplitude

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  • Method for suppressing random noise in seismic exploration based on VMD-TFPF

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Embodiment Construction

[0044] The present invention is based on VMD-TFPF suppression seismic prospecting random noise method, comprises the following steps:

[0045] 1) Decompose the noisy signal

[0046] Firstly, the variational mode decomposition method (VMD) is used to decompose each column of the noisy two-dimensional seismic data U(x,t), and a series of INF components c j , and these components are arranged in order from low frequency to high frequency;

[0047] 2) Calculate the cross-correlation coefficient and judge the modal component to be filtered:

[0048] First calculate the correlation coefficient between each mode, the reference formula is:

[0049]

[0050] In the formula, c i Indicates the jth mode, and j≥1; Indicates the cross-correlation coefficient between the jth and j+1th modes;

[0051] Then determine which modes need to be filtered, and use the cross-correlation coefficient to determine the boundary between the aliasing mode and the pure signal mode. Since the mode a...

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Abstract

The invention discloses a method for suppressing random noise in seismic exploration based on VMD-TFPF, which includes the following steps: (1) decomposing a noisy signal; (2) calculating the cross correlation coefficient, and judging modal components needing to be filtered; (3) filtering modes screened out; and (4) getting a de-noised signal through calculation. Seismic random noise can be effectively attenuated, and the effective signal amplitude can be well maintained in the filtering process. The algorithm of the scheme is easy to implement, and is of high operability. The problem of time-frequency peak filtering window size selection is avoided. The method is suitable for de-noising complex signals.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to a noise method, in particular to a method for suppressing random noise in seismic exploration based on VMD-TFPF. Background technique [0002] During seismic exploration, due to the influence of various factors, the collected seismic data contains a lot of noise. This noise, intertwined with available information about subsurface structure and lithology, makes the discovery and reservoir delineation of structural features such as faults, channels, and fractures, as well as features such as channel sand bodies, difficult. Therefore, it is necessary to process the collected data, extract relevant useful information from it, and then perform a series of subsequent processing. Among them, the suppression of random noise in seismic exploration is one of the key points. Due to the randomness of random noise, it is also difficult to deal with it. To obtain a better processing...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 高静怀李振
Owner XI AN JIAOTONG UNIV
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