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Coherent noise suppression method based on fractional order Fourier transformation

A technology of fractional Fourier and coherent noise, which is applied in the field of eliminating noise interference and using fractional Fourier transform to suppress coherent noise, and can solve problems affecting the quality of seismic recording stacking imaging quality and lateral resolution of seismic sections

Inactive Publication Date: 2012-01-18
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

Therefore, if these coherent noises 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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  • Coherent noise suppression method based on fractional order Fourier transformation
  • Coherent noise suppression method based on fractional order Fourier transformation
  • Coherent noise suppression method based on fractional order Fourier transformation

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Embodiment Construction

[0031] Exemplary 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. The embodiments are described below in order to explain the present invention by referring to the figures.

[0032] figure 1 is a flowchart illustrating a coherent noise suppression method according to an exemplary embodiment of the present invention. Such as figure 1 As shown, the coherent noise suppression method according to the exemplary embodiment of the present invention determines the apparent inclination angle based on the apparent velocity and direction of the coherent noise, and converts the estimated coherent noise data into the fractional domain according to the apparent inclination angle, so that the fractional domain to perform coherent noise prediction. The above method can effectively predict the coherent noise in the fractional domain in the seismic data wi...

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Abstract

The invention provides a coherent noise suppression method based on fractional order Fourier transformation. The method comprises the following steps of: estimating a frequency band and an apparent velocity range of coherent noises in monitored seismic data and extracting the seismic data in the frequency band; in the apparent velocity range, determining an apparent velocity direction corresponding to the apparent velocity by aiming at the extracted seismic data in the frequency band; determining an apparent dip angle according to the apparent velocity and the corresponding apparent velocity direction; carrying out fractional order Fourier transformation on the extracted seismic data in the frequency band according to the apparent dip angle; carrying out coherent forecasting on the seismic data subjected to the fractional order Fourier transformation to obtain forecasted coherent noises; and eliminating the forecasted coherent noises from the monitored seismic data.

Description

technical field [0001] The invention belongs to the field of petroleum seismic exploration data processing, and relates to a technology for eliminating noise interference, more specifically, relates to a method for suppressing coherent noise by using fractional Fourier transform. Background technique [0002] Seismic exploration is a geophysical exploration method that uses the difference in elasticity and density of underground media to infer the nature and shape of underground rock formations by observing and analyzing the response of the earth to artificially induced seismic waves. Seismic prospecting is an important means of surveying oil and natural gas resources before drilling, and it is also widely used in coal field and engineering geological exploration, regional geological research and crustal research. In seismic exploration, the most basic and important work is how to collect field seismic data and how to process and interpret them effectively. In order to obta...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 张华陈爱萍何光明曹中林罗红明吕文彪王玉华
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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