Method for performing difference AVO (amplitude versus offset) analysis by utilizing time-lapse seismic exploration data

A time-lapse seismic and difference technology, applied in seismic signal processing and other directions, can solve problems such as difference AVO analysis

Active Publication Date: 2012-06-20
NORTHWEST UNIV(CN)
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  • Abstract
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Problems solved by technology

Furthermore, the physical meaning of the AVO difference between the two time-lapse earthquakes is clearly explained, and the key problem of the difference AVO analysis in time-lapse earthquakes is solved.

Method used

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  • Method for performing difference AVO (amplitude versus offset) analysis by utilizing time-lapse seismic exploration data
  • Method for performing difference AVO (amplitude versus offset) analysis by utilizing time-lapse seismic exploration data
  • Method for performing difference AVO (amplitude versus offset) analysis by utilizing time-lapse seismic exploration data

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] The approximate elastic modulus simplified formula of the Zoeppritz equation (Bortfeld, 1961; Wang, 1999; Ma and Morozov, 2004)) can be expressed as two parts: the reflection coefficient of the fluid and the reflection coefficient of the rigid part. which is

[0042] R ( p ) ≈ R f ( p ) - 2 Δμ ρ p 2 = R f ( p ) - 2 Δμ ρ β 2 sin 2 φ - - ...

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Abstract

The invention relates to a method for performing difference AVO (amplitude versus offset) analysis by utilizing time-lapse seismic exploration data. A four-directional difference AVO expression is deduced from an approximate elastic modulus simplified formula (Bortfeld, 1961) of a Zoeppritz equation. The physical significance of difference between two time-lapse seismic AVOs is further clearly explained and the key problem of time-lapse seismic difference AVO analysis is solved. Analysis and reservoir prediction can be directly performed on amplitude difference between seismic data at two times by utilizing the expression. The difference AVO technology can be used for difference amplitude analysis of the time-lapse seismic (four-dimensional seismic) data. Changes in fluid, reflected by the difference amplitude can be fast identified. The saturation of the fluid can be further predicted.

Description

Technical field: [0001] The patent of the present invention relates to the field of seismic analysis, which is used for earthquake monitoring, and specifically relates to a method for differential AVO analysis using time-lapse seismic exploration data. Background technique: [0002] In time-lapse (four-dimensional) seismic monitoring, the AVO (Amplitude versus Offset) analysis technique has the potential to identify pore fluid changes and can be used to estimate pore fluid saturation and pressure (Tura and Lumley, 1999; Landro, 2001; Ma and Morozov, 2010). Similar to the traditional 2D and 3D AVO analysis based on isotropic media theory, different approximate formulas for the plane wave Zoeppritz equation (Shuey, 1986; Goodway, et al, 1997) can be used for 4D AVO analysis. However, no matter for Shuey's approximation or other approximation formulas, the difference AVO of 4D seismic does not have a concise expression with clear physical meaning. That is, what do time-lapse ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 马劲风
Owner NORTHWEST UNIV(CN)
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