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Unsteady seismic data time-frequency analysis method, computer storage medium and system

A technology of time-frequency analysis and seismic data, applied in the field of seismic exploration, can solve problems such as failure to meet reservoir description requirements, failure to identify thin layers, low resolution, etc., to avoid cross-item interference, reduce calculation time, and improve accuracy Effect

Pending Publication Date: 2021-02-02
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the prior art, due to the low resolution of the time-frequency analysis method, problems such as the inability to meet the requirements of reservoir description and the inability to identify thin layers, etc.

Method used

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  • Unsteady seismic data time-frequency analysis method, computer storage medium and system
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  • Unsteady seismic data time-frequency analysis method, computer storage medium and system

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Embodiment 1

[0058] This embodiment provides a time-frequency analysis method for unsteady seismic data, figure 1 Show the flow chart of the method of the embodiment of the present invention, as figure 1 As shown, it mainly includes the following steps S101 to S105.

[0059] In step S101, since the non-stationary seismic records have time-varying characteristics, the time-varying characteristics need to be considered when constructing the wavelet library, so the time-varying wavelet library is constructed. Further, the time-varying wavelet library is composed of multiple Reckel wavelets , the Lake wavelet has the highest similarity with the real seismic wavelet, and it is also one of the most commonly used wavelets in seismic exploration. Therefore, the Lake wavelet is selected to construct the time-varying wavelet library. The construction of the time-varying wavelet library mainly includes the following steps S1011 Go to step S1012.

[0060]In step S1011, the Reich wavelets with the sa...

Embodiment 2

[0121] This embodiment provides a computer storage medium, and a computer program is stored in the computer storage medium. When the computer program is executed by one or more processors, the time-frequency analysis method as described in Embodiment 1 is executed.

Embodiment 3

[0123] This embodiment provides a computer system, which includes a processor and a memory. A computer program is stored in the memory. When the processor executes the computer program, it executes the time-frequency analysis method described in Embodiment 1.

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Abstract

The invention discloses an unsteady seismic data time-frequency analysis method, a computer storage medium and a system. The method comprises the steps: determining a time-varying seismic record according to a time-varying wavelet library and a time-varying wavelet decomposition coefficient; estimating the value of the time-varying wavelet decomposition coefficient based on a kernel sparse regression method according to the time-varying wavelet library, and then constructing a time-varying wavelet subset; and determining time-frequency distribution of the time-varying seismic record based on aWigner-Willeigh distribution algorithm. The computer storage medium stores a computer program, the method is performed when the computer program is executed by a processor, the system comprises a processor and a memory, the processor performs the method when executing the computer program stored in the memory. According to the invention, the sparse kernel regression method is introduced, the time-varying wavelet is used as a learning sample, and the Wigner Willeigh distribution algorithm is combined to obtain the time-frequency domain distribution characteristics of the seismic data so that the cross term interference of the Wigner Willeigh distribution algorithm is avoided, and the accuracy of time-frequency analysis is improved.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a time-frequency analysis method for unsteady-state seismic data, and also relates to a storage medium and a system applying the time-frequency analysis method. Background technique [0002] Seismic waves are often affected by factors such as absorption and attenuation when they propagate underground, which makes seismic records appear as unstable. Time-frequency analysis method is a commonly used technical method in seismic data processing and interpretation. Transform the time-domain seismic signal into the time-frequency domain, and through the analysis of the time-frequency domain characteristics of the unsteady seismic signal, the attenuation characteristics or various attributes related to the reservoir can be obtained, which is beneficial to reservoir evaluation, gas-bearing prediction, etc. Describe link. [0003] Time-frequency analysis methods in the prior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/306
Inventor 纪永祯
Owner CHINA PETROLEUM & CHEM CORP
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