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A Bayesian linear ava and avf inversion method for viscoacoustic media

A viscoacoustic medium and Bayesian technology, applied in the field of viscoacoustic medium Bayesian linear AVA and AVF inversion, can solve the problem that the viscoacoustic medium AVA/AVF inversion work is still blank, and achieve the effect of comprehensive evaluation

Active Publication Date: 2017-08-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Even so, the research on AVA / AVF inversion of viscoacoustic media is still blank in China

Method used

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  • A Bayesian linear ava and avf inversion method for viscoacoustic media
  • A Bayesian linear ava and avf inversion method for viscoacoustic media
  • A Bayesian linear ava and avf inversion method for viscoacoustic media

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Embodiment Construction

[0053] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0054] The present invention combines the approximate formulas of AVA and AVF of viscoacoustic media with Bayesian theory, not only utilizes the information of the transformation of the amplitude with the incident angle, but also makes full use of the transformation information of the amplitude with the frequency. The variance matrix is ​​used to perform Bayesian linear AVA / AVF inversion to obtain the velocity and attenuation factor of the target layer.

[0055]The inventive method specifically comprises:

[0056] (1) Derivation and application of AVA / AVF approximate formula for viscoacoustic media

[0057] For viscoacoustic media, the phase velocity formula can be marked as:

[0058]

[0059] H(ω)=1+Q -1 F(ω),

[0060]

[0061] where c(ω) is the phase velocity and c is the velocity at the reference frequency. For constant density media, the reflection coef...

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Abstract

The invention provides a Bayesian linear AVA and AVF retrieval method of a sticky sound medium and belongs to the field of geophysical prospecting for petroleum. The method comprises the following steps: S1, inputting angle-domain seismic data, frequency-domain seismic data and log data; S2, establishing prior information and a likelihood function of the log data; S3, carrying out Bayesian linear AVA and AVF retrieval by using the prior information and the likelihood function so as to obtain a velocity and a quality factor.

Description

technical field [0001] The invention belongs to the field of petroleum geophysical exploration, and in particular relates to a Bayesian linear AVA and AVF inversion method for a viscoacoustic medium. Based on the viscoacoustic medium, Bayesian theory is used to perform AVA and AVF inversion to obtain sound wave velocity and attenuation factor. Background technique [0002] Conventional AVO (amplitude versus offset) or AVA (amplitude versus angle of incidence) is always based on the assumption that the subsurface medium is perfectly elastic. VSP records, well logging data, and petrophysical measurements in the laboratory all show that seismic waves will attenuate and disperse during propagation, especially for formations containing hydrocarbons, where the attenuation of seismic waves is more obvious. In fact, ignoring the effect of seismic wave attenuation will bring huge risks to AVO analysis. [0003] According to the seismic wave propagation theory, some foreign scholars ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 滕龙王世星
Owner CHINA PETROLEUM & CHEM CORP
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