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Regular linear interference suppressing method based on polynomial fitting

A technology of polynomial fitting and linear interference, which is applied in seismic signal processing and other directions, can solve the problems affecting the quality of seismic recording stacking imaging and the lateral resolution of seismic sections, and achieve the effect of improving the processing quality

Active Publication Date: 2012-09-19
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Therefore, if these regular linear interferences cannot be well suppressed, it will eventually affect the stacked imaging quality of seismic records and the lateral resolution of seismic sections.

Method used

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  • Regular linear interference suppressing method based on polynomial fitting
  • Regular linear interference suppressing method based on polynomial fitting
  • Regular linear interference suppressing method based on polynomial fitting

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Embodiment Construction

[0016] Embodiments of the present invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0017] The polynomial fitting technique assumes that the signal appears on each channel in accordance with an undetermined polynomial, instead of using the assumption of the same time or linear change, and assumes that the amplitude change of each channel can also be approximated by a polynomial, so that the correlation is better. The linear interference can be fitted by a polynomial, so that regular linear interference suppression can be performed. The difference between the original data and the fitted regular linear interference data is the denoised data, so that the processed data can be kept as much as possible. The original resolution is improved, the signal-to-n...

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Abstract

The invention provides a regular linear interference suppressing method based on polynomial fitting, comprising the following steps of: (a) artificially recognizing an apparent velocity range of regular linear interferences; (b) performing frequency separation processing on the acquired seismic data through wavelet transform, thereby obtaining low frequency data and high frequency data; (c) determining an apparent dip range of noise data according to the apparent velocity range of the noise data, performing optimal mid-value scanning of apparent dips, and determining the optimal direction of the regular linear interference at the current apparent dip; (d) performing polynomial fitting on the noise data in the optimal direction of the regular linear interference; (e) repeating the steps (c) and (d) until all regular linear interferences in the low frequency data are fitted out; (f) reducing the fitted regular interference data from the original low frequency data obtained through frequency separation, thereby obtaining low frequency data after the regular interference is suppressed; and (g) obtaining the seismic data after the noise is suppressed according to a polynomial fitting rule from the low frequency data after the regular interference is suppressed and the original high frequency data after frequency separation.

Description

technical field [0001] The invention relates to petroleum seismic exploration and belongs to the field of seismic exploration data processing and interpretation. More specifically, the invention relates to a regular linear interference suppression method. Background technique [0002] The source of noise in complex mountainous seismic data is very complex, and the noise has strong interference on effective waves, especially in seismic data, there are quite serious regular linear interferences, such as shallow strong-energy surface multiple refraction waves and regular linear interference, Strong sound wave interference in the middle and deep layers, and direct waves on the surface with a wide frequency band. In general, these interferences destroy the effective reflection signal, and in severe cases, cover the entire seismic record, completely submerge the effective signal, and greatly reduce the signal-to-noise ratio of seismic data. For these interferences, the convention...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 张华陈爱萍何光明金德刚罗红明曹中林尹陈王珑
Owner BC P INC CHINA NAT PETROLEUM CORP
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