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Method and system for calculating stratum quality factor

A technology of formation quality factor and calculation method, which is applied in the field of formation quality factor calculation method and system, can solve problems such as poor stability and accuracy of estimation results, quality factor error, noise sensitivity, etc., and achieve high stability and noise resistance, Good noise immunity and high calculation accuracy

Active Publication Date: 2019-03-12
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The spectral ratio method obtains the quality factor by fitting the linear relationship between the logarithmic spectral ratio and the frequency before and after attenuation. Its theoretical estimation results are very accurate when there is no noise, but it is very sensitive to noise. The stability and precision of the estimated results are poor
The centroid frequency method inverts the quality factor of the formation by establishing the relationship between the centroid frequency change of seismic waves before and after attenuation and the quality factor Q value. Since the statistical characteristics of the amplitude spectrum are used, this method has better anti-noise performance. However, it assumes that the source wavelet satisfies a specific shape (such as meeting the Gaussian distribution), so when the actual wavelet is inconsistent with the assumption, there is a certain error in the estimated quality factor

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  • Method and system for calculating stratum quality factor
  • Method and system for calculating stratum quality factor
  • Method and system for calculating stratum quality factor

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[0037] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0038] figure 1 A flowchart showing the steps of the formation quality factor calculation method according to the present invention.

[0039] In this embodiment, the formation quality factor calculation method according to the present invention may include: step 101, calculating the power spectrum of the attenuation wavelet according to the amplitude spectrum of the attenuation wavelet; step 102, converting the power spectrum of the attenuation wavelet into a pair in numerical form; ...

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Abstract

The invention discloses a method and system for calculating a stratum quality factor. The method can include the steps of calculating the power spectrum of attenuation wavelets according to the amplitude spectrum of the attenuation wavelets, converting the power spectrum of the attenuation wavelets into the logarithmic form, and conducting integral operation on the attenuation wavelet power spectrum of the logarithmic form to obtain the stratum quality factor. The method has the advantages of being high in theoretical calculating precision and stability and good in anti-noise performance, andthe calculating result of the method can be used for subsequent earthquake data processing and explaining such as earthquake absorption attenuation compensation and natural gas detection.

Description

technical field [0001] The present invention relates to the field of seismic exploration, and more specifically, to a method and system for calculating formation quality factors. Background technique [0002] Quality factor is an important parameter to describe the attenuation characteristics of subsurface media. Accurate and reliable estimation of quality factor is of great significance in seismic processing and interpretation. At present, the quality factor estimation methods commonly used in the industry can be mainly divided into two categories, namely the time domain method and the frequency domain method, and each type of method includes many different methods. Among them, frequency domain methods are widely used in actual seismic exploration, such methods are represented by spectral ratio method and centroid frequency method. The spectral ratio method obtains the quality factor by fitting the linear relationship between the logarithmic spectral ratio and the frequenc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/584G01V2210/62
Inventor 李京南朱童
Owner CHINA PETROLEUM & CHEM CORP
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