Method for improving surface wave attenuation performance in seismic data processing

A seismic data and seismic wave technology, applied in the field of geophysical exploration, can solve the problems of improving and limiting the signal-to-noise ratio and resolution of seismic data processing, and achieve the effect of improving signal-to-noise and ratio resolution and improving attenuation performance

Active Publication Date: 2011-06-01
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

This attenuation method is to process the surface wave of a single seismic trace, and does not distinguish between the effective signal and the surface wave during attenuation, so that

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  • Method for improving surface wave attenuation performance in seismic data processing
  • Method for improving surface wave attenuation performance in seismic data processing
  • Method for improving surface wave attenuation performance in seismic data processing

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Embodiment 1

[0027] Embodiment 1 is a process in which the method for improving the surface wave attenuation performance in seismic data processing of the present invention is applied to single shot recording of actual seismic data, figure 1 is the single shot record of raw seismic data: figure 2 is true figure 1 Single-shot recording after surface wave attenuation was performed. right figure 1 The single-shot record calculates that the surface wave velocity roughly ranges from 800 m / s to 2200 m / s, and the surface wave energy is relatively strong and concentrated, so the time window is selected to be 100 milliseconds, and the spatial seismic traces are selected to be 9 seismic traces.

[0028] From figure 1 and figure 2 From comparative analysis, it can be seen that figure 1 The surface wave in is attenuated by the signal effect, and the event axis of the effective signal is in figure 1 It is blurry in the middle, but after the surface wave is attenuated figure 2 But it is very c...

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Abstract

The invention relates to a method for improving a seismic processing signal to noise ratio and resolution ratio for geophysical exploration seismic data processing, comprising: determining the apparent velocity of the surface wave according to a single shot record; carrying out small time window and space window division on the single-shot seismic record data; carrying out linear energy dip angle scanning on the divided space window; selecting the dig angle of the strongest linear energy; when the speed corresponding to the line of the maximum value of the amplitude quadratic sum is between the maximum apparent velocity and the minimum apparent velocity of the surface wave, attenuating because of determining as the surface wave; and otherwise, carrying no attenuation because of determining as the effective signal. The linear energy scanning method favorably separates the surface wave and the effective signal, and then the surface wave is attenuated to protect the effective signal; meanwhile, the purpose of improving the signal to noise ratio and the resolution ratio in the seismic data processing can be realized; and surface wave attenuation performance is improved.

Description

technical field [0001] The invention relates to geophysical prospecting technology, and is a method for improving the signal-to-noise ratio and resolution of seismic data processing in geophysical prospecting seismic data processing. Background technique [0002] In geophysical seismic data processing technology, surface wave attenuation is an important link in seismic data processing, and it is also an important measure to improve the signal-to-noise ratio and resolution of seismic data. Attenuation of surface waves distributed in the domain. The main principle of this high-pass filter surface wave attenuation method is based on the characteristics of the relatively low surface wave frequency of seismic data. Generally, the surface wave frequency of seismic data is concentrated around 10 Hz, while the frequency of effective reflection seismic data is generally around 8 to 150 Hz. In this way, the surface wave can be attenuated according to the difference in frequency distr...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 熊定钰赵波
Owner BC P INC CHINA NAT PETROLEUM CORP
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