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Method for extracting fluid factor

A fluid factor and extraction method technology, applied in the field of seismic exploration, can solve the problems of different seismic wave velocities, etc., and achieve the effects of reducing interference, accurate detection and identification

Inactive Publication Date: 2012-01-04
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

However, this method is only used to describe seismic waves without dispersion
If there is dispersion phenomenon, the velocity of seismic waves of different frequencies is different. For the same point in the formation, although the difference in velocity is small, linear frequency modulation components may still appear
Therefore, this method is not suitable for the presence of dispersion

Method used

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Embodiment Construction

[0036] Various example embodiments will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown.

[0037] figure 1 A fluid factor extraction method according to an embodiment of the present invention is shown.

[0038] In step 101, at least one piece of seismic data in the work area is detected.

[0039] In step 102, an initial value of the fractional order α for performing the fractional Fourier transform is set, where the initial value of the fractional order α can be set arbitrarily.

[0040] In step 103, the fractional order Fourier transform X of one seismic data x(t) in the at least one seismic data is calculated by applying fractional order α α (u), that is,

[0041] X α ( u ) = 1 - ...

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Abstract

The invention provides a method for extracting a fluid factor. The method comprises the following steps of: detecting at least one channel seismic data in a work area; setting an initial value of a fractional order number used for fractional order Fourier transform; calculating the fractional order Fourier transform of one channel seismic data in the at least one channel seismic data according tothe fractional order number; calculating an analytic signal of the fractional order Fourier transform, and Wigner-Ville distribution with suppressed cross terms of the analytic signal; calculating Radon transform of a band window of the Wigner-Ville distribution with the suppressed cross terms; reconstructing a time frequency distribution map according to the Radon transform of the band window; and extracting the fluid factor from the time frequency distribution map. According to the method for extracting the fluid factor, the fluid factor can be accurately extracted from seismic waves even though the seismic waves have a dispersion effect.

Description

technical field [0001] The present invention relates to the field of seismic exploration. More specifically, it relates to a fluid factor extraction method. Background technique [0002] In seismic exploration, fluid factor extraction is a very important technology. Accurate fluid factors allow for more accurate detection and identification of underground mineral deposits. Currently, seismic data can be analyzed by time-frequency analysis methods to obtain fluid factors. The time-frequency analysis method can provide the joint distribution information of the time domain and the frequency domain, and can more clearly describe the relationship between the frequency of the signal and the time variation. [0003] Below, a fluid factor extraction method in the prior art is shown. [0004] For a given seismic data x(t), its Wigner (Wigner) distribution W x (t, f) is defined as follows: [0005] W x ( t ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 邹文张洞君李忠张靖彭真明洪余刚吴秋波
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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