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A method for removing various noises under the condition of complex surface

A complex surface and noise technology, applied in the direction of seismic signal processing, etc., can solve the problem of poor noise removal effect, achieve broad market application prospects, obvious effect, and good amplitude preservation effect

Inactive Publication Date: 2015-02-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0024] The purpose of the present invention is to provide a method for removing various noises under complex surface conditions, so as to solve the problem of poor noise removal effect in the current noise removal process

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  • A method for removing various noises under the condition of complex surface
  • A method for removing various noises under the condition of complex surface
  • A method for removing various noises under the condition of complex surface

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Embodiment Construction

[0046] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0047] In order to solve the existing defects in noise removal, the present invention provides a method for removing various noises under complex surface conditions. This method can remove various noises to the greatest extent and retain effective signals in seismic signals. The flow of the method Such as figure 1 As shown, the specific steps are as follows:

[0048] 1. Perform static correction processing on the collected original seismic signals. Before noise removal, seismic data must be processed by static correction to regularize the regular interference caused by distortion caused by static correction. The processing process of static correction is as follows:

[0049] a. Establish an initial velocity model in the inverted geological region using the first arrival travel time;

[0050] b. Mesh the established initial velocity model;...

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Abstract

The invention relates to a method for removing various noises under the condition of complex surface and belongs to the technical field of petroleum and natural gas seismic data processing. The method is characterized by, to begin with, carrying out static correction processing on collected original seismic signals; then, determining noise characteristics at multiple domains and in divided frequency bands and carrying out noise removal; and finally, carrying out merging reconstruction on signals of each frequency band obtained after noise removal, and establishing full frequency band seismic signals, so that removal of the noise of the full frequency band seismic signals is realized. Accuracy of determining the noise characteristics at multiple domains of the seismic signals with different frequency bands can be guaranteed through the static correction processing; and the signals are subjected to frequency division processing, so that advantage frequency bands are centralized in some frequency band, and the noise is suppressed to the maximum degree and effective signals are kept. The method effectively overcomes the influence of the complex surface on the noise removal effect, and meanwhile, overcomes the limitation that the existing de-noising technology is only targeted for a certain kind of noise; and the method is good in amplitude-preserving performance, and obvious in effect, and has wide market application prospect.

Description

technical field [0001] The invention relates to a method for removing various noises under complex surface conditions, and belongs to the technical field of petroleum and natural gas seismic data processing. Background technique [0002] The focus of current seismic exploration has shifted to complex surface areas. The acquisition of seismic data in complex surface areas is very complicated, with various terrains and large surface undulations, and there are many factors affecting construction. Due to the influence of many factors, the collected data are also quite different. Most of the data have a low signal-to-noise ratio and a variety of noises. [0003] Noise interference is divided into regular interference and random interference. Regular interference mainly includes surface waves, sound waves, refracted waves, ghost reflections, etc. Random noise interference includes instrument noise, microseismic, human motion, and wind interference. There are always these two typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 李斌孔剑冰司卫何和英马锐蒲春志
Owner CHINA PETROLEUM & CHEM CORP
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