Gas content detection method based on maximum entropy Wigner-Ville distribution

A detection method and maximum entropy technology, which is applied in natural gas exploration and development, and petroleum fields, can solve the problem of low accuracy of gas detection and achieve the effect of accurate judgment

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a gas-containing detection method based on the maximum entropy Wegener-Will distribution in view of the low accuracy of gas-containing detection in the prior art

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  • Gas content detection method based on maximum entropy Wigner-Ville distribution
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  • Gas content detection method based on maximum entropy Wigner-Ville distribution

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing, the present invention is described in detail.

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0045] Such as figure 1 As shown, a kind of gas-containing detection method based on the maximum entropy Wegener-Will distribution of the present invention comprises:

[0046] For seismic signals, S100 obtains high-precision time-spectrum (that is, high-resolution time-spectrum) through the method of maximum entropy Wegener-Will distribution;

[0047] In recent years, methods including Wegener-Will distribution, wavelet transform, S-transform and matching pursuit have appeared, and these techniq...

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Abstract

The invention discloses a gas-containing property detection method based on maximum entropy Wigner-Ville distribution, which adopts Wigner-Ville time-frequency distribution, and utilizes an MEM method to extrapolate a kernel function in the Wigner-Ville time-frequency distribution to fill up data outside an observation interval so as to eliminate cross terms of the Wigner-Ville time-frequency distribution. According to the method, the high-precision time-frequency spectrum is obtained, and then the instantaneous frequency is obtained according to the high-precision time-frequency spectrum to judge the reservoir gas well, so that the actual gas-bearing condition is more objectively inverted, and the type (gas producing well or dry well) of the gas well can be more accurately judged.

Description

technical field [0001] The invention relates to the field of oil and natural gas exploration and development, in particular to a gas-containing detection method based on the maximum entropy Wegener-Will distribution. Background technique [0002] Seismic signals are non-stationary signals, and their instantaneous frequency varies with time. The traditional calculation of instantaneous frequency is realized by using complex traces of Hilbert transform. In recent years, with the emergence of time-frequency analysis method technology, the instantaneous frequency is obtained by time-frequency analysis method with higher precision. The commonly used time-frequency methods for non-stationary ground motion signals include short-time Fourier transform, wavelet transform and Wegener-Will distribution, S-transform, Hilbert-Huang transform and some improved algorithms. These methods have been widely used, but there are still some deficiencies in these methods. The short-time Fourier t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/63
Inventor 许多董霞喻勤王浩钱玉贵杨国鹏刘红爱王鹏范红娟高顺华
Owner CHINA PETROLEUM & CHEM CORP
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