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Spectrum analysis method of seismic signal and apparatus thereof

A spectrum analysis device and seismic signal technology, which is applied in the field of spectrum analysis of seismic signals, can solve problems affecting the time-frequency resolution of seismic signal spectrum analysis, and achieve the effect of high time-frequency resolution

Active Publication Date: 2012-05-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Description
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  • Application Information

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Problems solved by technology

[0026] The main purpose of the embodiments of the present invention is to provide a method and device for spectral analysis of seismic signals to solve the problem of WVD in the prior art that affects the time-frequency resolution of spectral analysis of seismic signals due to the existence of cross terms

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  • Spectrum analysis method of seismic signal and apparatus thereof
  • Spectrum analysis method of seismic signal and apparatus thereof
  • Spectrum analysis method of seismic signal and apparatus thereof

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Embodiment 1

[0047] The embodiment of the present invention provides a seismic signal spectrum analysis method, figure 1 Is the flow chart of the method, such as figure 1 As shown, the method includes:

[0048] Step 101: Obtain seismic signals;

[0049] Step 102: Perform Hilbert transform operation on the seismic signal to obtain an analytical signal of the seismic signal;

[0050] Step 103: WVD processing the analytical signal;

[0051] Step 104: Determine a Gaussian window function and attenuation coefficient according to the result of the WVD processing;

[0052] Step 105: Perform a smooth pseudo WVD distribution time-frequency analysis process on the result of the WVD processing according to the determined Gaussian window function and attenuation coefficient.

[0053] It can be seen from the above description that by smoothing the pseudo WVD distribution time-frequency analysis processing on the result of the WVD processing according to the determined Gaussian window function and attenuation co...

Embodiment 2

[0089] The embodiment of the present invention also provides a seismic signal spectrum analysis device, which is preferably used to implement the method in the first embodiment, such as Image 6 As shown, the device includes:

[0090] The seismic signal acquisition unit 1 is used to acquire seismic signals;

[0091] The analytical signal obtaining unit 2 is used to perform Hilbert transform operation on the seismic signal to obtain the analytical signal of the seismic signal:

[0092] WVD processing unit 3 for WVD processing the analytical signal;

[0093] The Gaussian function determining unit 4 is used to determine the Gaussian window function and the attenuation coefficient according to the result of the WVD processing;

[0094] The smoothing pseudo WVD processing unit 5 is configured to perform smoothing pseudo WVD distribution time-frequency analysis processing on the result of the WVD processing according to the determined Gaussian window function and attenuation coefficient.

[00...

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Abstract

The invention provides a spectrum analysis method of a seismic signal and an apparatus thereof. The method comprises the following steps: acquiring the seismic signal; carrying out Hilbert transformation operation on the seismic signal to obtain an analytic signal of the seismic signal; carrying out WVD processing on the analytic signal; according to a result of the WVD processing, determining a Gauss window function and an attenuation coefficient; according to the determined Gauss window function and the attenuation coefficient, carrying out smooth pseudo-WVD distribution time frequency analysis processing on the result of the WVD processing. Through the method and the apparatus in the invention, a high time frequency resolution of seismic signal spectrum analysis can be obtained.

Description

Technical field [0001] The present invention relates to the technical field of seismic exploration, and in particular to a method and device for spectrum analysis of seismic signals. Background technique [0002] Seismic signal processing is a new spectrum analysis technology, which is mainly used in reservoir structure description and fluid property identification of oil and gas reservoirs to provide information for oil and gas reservoir exploration and development, thereby reducing risk costs and improving oil and gas production efficiency. At present, the spectrum analysis of seismic signals can be implemented in the following three ways: [0003] (1) Short Time Fourier Transform (Short Time Fourier Transform, STFT) [0004] In order to obtain the frequency information of the local signal at a certain moment, in 1946, Gabor proposed the short-time Fourier transform (STFT) concept: [0005] Given a signal f(t)∈L 2 (R), its Fourier transform is: [0006] f ^ ( ω ) = ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 李向阳吴小羊陈双全戴恒昌
Owner BC P INC CHINA NAT PETROLEUM CORP
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