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Three-parameter-based nolinear AVO (Amplitude Versus Offset) fluid judging method

A discriminant method and non-linear technology, which is applied in the field of seismic exploration data processing and interpretation, can solve the problems of not considering the density change and not being established, and achieve the effect of reliable AVO analysis results and effective fluid discrimination

Active Publication Date: 2012-01-04
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

[0004] The above-mentioned methods all adopt the precondition that the ratio of compressional and shear waves is close to 2 in practical application, but this assumption is not valid in most areas, and most of them do not consider the density change

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  • Three-parameter-based nolinear AVO (Amplitude Versus Offset) fluid judging method
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  • Three-parameter-based nolinear AVO (Amplitude Versus Offset) fluid judging method

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Embodiment Construction

[0022] A non-linear AVO fluid discrimination method based on three parameters, comprising the following steps:

[0023] a. Arrange the Aki&Richards equation, get

[0024] R ( θ ) = 1 2 ( Δα α ) ( 1 + tan 2 θ ) - 4 γ 2 ( Δβ β ) sin 2 θ - 1 2 Δρ ρ [ 1 - 4 γ 2 sin 2 θ ] , Among them, γ=β / α is the rati...

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Abstract

The invention discloses a three-parameter-based nolinear AVO (Amplitude Versus Offset) fluid judging method. As for the longitudinal and transverse wave speed ratio of a block storage layer section, the invention provides a novel three-parameter AVO analyzing method for representing longitudinal and transverse wave speed and density change ratio characteristics; an AVO approximate equation which is targeted, is peculiar to the block and contains the speed change characteristics is obtained; and the fluid judgment is carried out by combining the fluid factor of the block so that an AVO analyzing result is more reliable.

Description

technical field [0001] The invention relates to a non-linear AVO fluid discrimination method based on three parameters, belonging to the field of seismic exploration data processing and interpretation. Background technique [0002] AVO (Amplitude versus Offset) studies the relationship between seismic P-wave amplitude and offset. The combination of AVO analysis and seismic inversion provides a new method for fluid prediction and lithology prediction. It can directly explain the lithology and predict the transformation of underground lithology and fluid. Its theoretical basis is the Zoeppritz equation describing the energy relationship between various reflected waves and transmitted waves generated by plane longitudinal waves at the impedance interface. [0003] Because the Zoeppritz equation is too complex, it is difficult to directly see the parameters that have a direct impact on the reflection coefficient. Over the years, many scholars have derived its approximate expres...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 杨晓杜增利康昆黄诚赖娟凌征翔
Owner BC P INC CHINA NAT PETROLEUM CORP
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