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Method for attenuating rayleigh wave scattered noise in earthquake data-handling

A technology for scattering noise and seismic data, applied in the field of attenuating Rayleigh wave scattering noise, and can solve problems such as loss of effective waves

Inactive Publication Date: 2008-12-31
徐基祥
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Problems solved by technology

The filtering method can effectively remove surface wave interference, but the biggest defect of the filtering method is that it also loses part of the effective wave while removing the noise.

Method used

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  • Method for attenuating rayleigh wave scattered noise in earthquake data-handling
  • Method for attenuating rayleigh wave scattered noise in earthquake data-handling
  • Method for attenuating rayleigh wave scattered noise in earthquake data-handling

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Embodiment Construction

[0071] In order to improve the signal-to-noise ratio of seismic data, the present invention proposes a method for attenuating Rayleigh wave scattering noise in seismic data processing. In this method, the linear wave field transform, wavelet transform and α-trimmed filter technology are used to extract the incident wave field of Rayleigh wave scattering and calculate the wavelet. The estimated scattered wavefield is subtracted from the wavefield, thereby effectively improving the signal-to-noise ratio of the seismic data.

[0072] The method of attenuating Rayleigh wave scattering noise in seismic data processing includes the following steps:

[0073] (1) In the favorable zones for oil and gas exploration preliminarily determined by geological work and other geophysical prospecting work, arrange survey lines and gun positions according to a certain observation system, use explosion source or vibrator to excite seismic waves, and use seismograph to record the seismic wave field...

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Abstract

The invention provides a method for attenuating Rayleigh wave scattering noise during the seismic data processing, the method only carries out the scattering noise attenuation processing of a frequency band which mainly contains a scattering wave field and does not affect the characteristics of the original wave fields of other frequency bands, so the method is the noise removing method with the relative fidelity. The method comprehensively utilizes the linear wave field transform, the wavelet transform and the Alpha-trimmed filtering technology to extract the Rayleigh wave scattering incident wave field and calculate the wavelet, then the best estimation of the scattering wave field is realized through the inversion technology of the scattering wave field, and the estimated scattering noise is further subtracted from the original wave fields, thereby effectively improving the signal-to-noise ratio of seismic information.

Description

technical field [0001] The invention relates to a seismic data processing method, in particular to a method for attenuating Rayleigh (Rayleigh) wave scattering noise in the field of seismic data processing in geophysical exploration. Background technique [0002] Seismic exploration is a method of geophysical prospecting that uses artificial seismic technology to stimulate seismic waves and study the propagation of seismic waves in the formation to find out the geological structure or lithology characteristics of the underground and serve the purpose of finding oil and gas reservoirs or other exploration purposes. Seismic exploration is the most effective method among the various geophysical prospecting methods for oil exploration. [0003] The production work of seismic exploration can basically be divided into three links: seismic data acquisition, seismic data processing, and seismic data interpretation: [0004] The first link is seismic data acquisition. The main task...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 徐基祥杨旭明胡英张才
Owner 徐基祥
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