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Noise elimination method based on signal and noise separation

A technology of signal-to-noise separation and noise, applied in the field of geophysical exploration, can solve the problems of single application of denoising methods, and achieve the effect of overcoming single technical application, obvious effect, and good amplitude preservation

Inactive Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a noise removal method based on signal-to-noise separation to solve the problem of single limitation in technical application of existing denoising methods

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  • Noise elimination method based on signal and noise separation
  • Noise elimination method based on signal and noise separation
  • Noise elimination method based on signal and noise separation

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Embodiment Construction

[0025] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] The present invention adopts the idea of ​​"protecting effective waves to the greatest extent and suppressing interference waves to the greatest extent", and its process is as follows figure 1 As shown, the following figure 2 The original pre-stack seismic data is given as an example to describe the denoising process of the present invention in detail, which specifically includes the following steps.

[0027] 1. Separation of signal and noise from raw prestack seismic records

[0028] The existing multi-domain denoising technology is used to perform multi-domain denoising on pre-stack seismic data. The multi-domain denoising technology here includes T-P domain, F-K domain, F-X domain and T-W domain. Remove as much noise as possible to ensure that the denoising is as thorough as possible. After denoising, the primary signal model an...

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Abstract

The invention relates to a noise elimination method based on signal and noise separation, and belongs to the technical field of geophysical exploration. The thought that effective waves are protected to the maximum degree and interference waves are suppressed to the maximum degree is adopted, firstly, signal and noise separation is conducted on a pre-stack seismic record, the pre-stack seismic record is separated into a signal model and a noise model, signal and noise separation is conducted on the noise model again, and the noise model is separated into a secondary signal model and a secondary noise model; the process is repeated two to three times; finally, data reconstruction is conducted on all the signal models separated previously, and then seismic data including most of effective signals are acquired, wherein noise of the seismic data is completely removed. The influences of all kinds of noise caused by the complex near-surface condition are avoided, the limitation that an existing denoising method is single in technology application is overcome, and the method has the advantages of being good in amplitude preservation, obvious in effect and wide in market application prospect.

Description

technical field [0001] The invention relates to a noise removal method based on signal-to-noise separation, and belongs to the technical field of geophysical exploration. Background technique [0002] With the advancement of seismic exploration technology, the volume of seismic data collected in the field is getting larger and larger. Along with the increase in the amount of effective reflected wave information, various interference waves are also highlighted. With the continuous deepening of the exploration target layer, it is required that the seismic section can better reflect the seismic features of the deep layer. How to remove the noise and protect the low-frequency effective information has become an important link in the deep seismic data processing. At present, the exploration target layer is deep, with complex structure, low signal-to-noise ratio and various interference waves. [0003] Pre-stack denoising technology is a crucial link in seismic data processing, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 司卫商建立李斌万城程马锐王雷
Owner CHINA PETROLEUM & CHEM CORP
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