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Method and system for eliminating outlier interference of seismic data

A technology of seismic data and outliers, which is applied in the field of eliminating the interference of outliers in seismic data, and can solve problems such as the adverse effects of extracting seismic attribute parameters, seismic data distortion, and inappropriate processing methods

Active Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Using the above method to eliminate outlier interference can easily lead to the influence of normal seismic data while eliminating outlier interference, which leads to the distortion of seismic data to a certain extent, which will affect the future use of prestack seismic data. Data Extraction Seismic Attribute Parameters Cause Adverse Effects
Therefore, if the outlier interference area in the actual seismic data is large, processing modules such as AAA can be used to eliminate the outlier interference, but if the outlier interference in the actual seismic data is relatively small, such a processing method is not appropriate

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  • Method and system for eliminating outlier interference of seismic data
  • Method and system for eliminating outlier interference of seismic data

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[0021] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0022] figure 1 A flow chart showing the steps of the method for eliminating outlier interference of seismic data according to the present invention.

[0023] In this embodiment, the method for eliminating outlier interference of seismic data according to the present invention may include:

[0024] Step 101, based on the original shot set data, pick the outlier trace, and determine the apparent velocity at the top of the first wave band and the time window length of the first wave ba...

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Abstract

The invention discloses a method and system for eliminating outlier interference of seismic data. The method comprises the steps of picking up an outlier trace based on original shot gather data, anddetermining the apparent velocity at the top of a head wave band and the time window length of the head wave band; calculating the top time of a head wave band time window corresponding to each seismic trace, determining the head wave band time window corresponding to each seismic trace, and obtaining a head wave horizontal time window and a reflected wave horizontal time window corresponding to each seismic trace; calculating the maximum value of the absolute amplitude of the outlier trace and the average of the maximum absolute amplitudes of adjacent normal traces within the time window, calculating an amplitude correction factor, obtaining an amplitude correction value, and obtaining an outlier trace after the amplitude correction; and carrying out spatial median filtering to obtain a median filtering value, replacing the amplitude correction value with the median filtering value to obtain a replacement seismic trace, and obtaining seismic traces with the outlier interference beingeliminated. The method can effectively eliminate the influence of outlier interference without transforming the normal seismic traces, thereby avoiding data distortion of the normal seismic traces.

Description

technical field [0001] The present invention relates to the technical field of seismic data processing, and more specifically, to a method and system for eliminating outlier interference of seismic data. Background technique [0002] In the process of seismic data processing, the interference of outliers often has a serious impact on the final processing quality of seismic data. Generally speaking, it is difficult for processors to eliminate the influence of outlier interference according to the usual formal processing procedures during the processing process. It is only possible to eliminate the influence of outlier interference through special processing technology for outlier interference. People's treatment of outlier interference has also gone through two stages: at first, when processing seismic data, the seismic traces with outlier interference are generally eliminated as abnormal traces (that is, the amplitude value of the seismic trace with outlier interference It ...

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Application Information

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IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/30G01V1/364G01V2210/324
Inventor 李文杰陈世军刘来祥
Owner CHINA PETROLEUM & CHEM CORP
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