Peak noise suppression method of variable-window weighted seismic data

A spike noise and seismic data technology, applied in the field of seismic data processing, can solve problems such as signal loss, non-recoverability, and increased acquisition costs, and achieve the effects of ensuring data quality, retaining signal energy, and achieving fast speed

CN110542927AActive Publication Date: 2019-12-06JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-12-06

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Abstract

The invention relates to a peak noise suppression method of variable-window weighted seismic data and aims at solving various problems that peak noise has characteristics of high energy, occurrence time randomness and wide frequency band, a noise source is complicated and variable to cause that a plurality of peak noises have different continuous time and frequency band widths, the peak noise cannot be favorably suppressed by a fixed-window peak noise suppression method and the applicability is poor. Through experiment, the method has a favorable suppression effect on seismic data disturbed bystrong peak noise with different continuous time, the peak noise is effectively suppressed, and the characteristic of a signal can be maintained according to a detected peak noise changing window length autonomous estimation weight. Compared with an existing mid-value substitution method, the peak noise suppression method has the advantages that the resolution of identifying the peak noise is higher, and the signal energy is fully maintained; and meanwhile, the peak noise suppression method is applicable to different environmental situations, the characteristic of the peak noise is analyzed in real time, the peak noise is suppressed, and the quality of acquired data is effectively ensured.
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Description

Technical field:

[0001] The invention relates to a seismic data processing method, in particular to a duration-based variable window weighted seismic data spike noise suppression method, which is especially suitable for denoising processing of seismic signals seriously interfered by spike noise. Background technique:

[0002] The noise environment in the process of seismic exploration data acquisition is very complex. In addition to random noise and power frequency interference, the collected seismic data also has significant spike noise. As the signal-to-noise ratio of the data decreases, the frequency of spike noise increases. The quality dropped drastically. The peak noise is usually similar to the signal amplitude or significantly higher than the signal and other types of noise in terms of signal amplitude. Therefore, the existence of a large number of spike noise makes it difficult to detect and identify effective signals.

[0003] At present, the commonly used suppres...

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Embodiment Construction

[0040] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail

[0041] The technical feature of the method of the present invention is that, according to the characteristic that the peak noise energy changes quickly and the duration is short, firstly, the number, position and duration of the spike noise are judged by using the ratio of the amplitude variation, and the duration and the ratio of the spike noise to the signal energy are automatically Adaptive gives the median calculation window and weight of each spike noise point.

[0042] The variable window weighted seismic data peak noise suppression method includes the following steps:

[0043] a. Given an ideal vibroseis output signal s(n) without noise, n∈[1,N] as an ideal signal, such as figure 1 (a) shown. x(n) is the received random noise r(n) and spike noise r 1 (n), r 2 (n) and r 3 The vibroseis seismic signal of (n) has a time shift of 2s from s(n)...