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Method for carrying out reservoir prediction by using Zoeppritz impedance

A technology for reservoir prediction and elastic impedance, applied in seismic signal processing and other directions

Active Publication Date: 2013-06-26
NORTHWEST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

For carbonate rocks, volcanic rock reservoirs, coal seams and other reservoirs with large differences in lithology between the upper and lower layers, and the first and third types of gas-bearing sandstones, the elastic impedance inversion based on the formula of Aki and Richards cannot obtain reasonable results

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  • Method for carrying out reservoir prediction by using Zoeppritz impedance
  • Method for carrying out reservoir prediction by using Zoeppritz impedance
  • Method for carrying out reservoir prediction by using Zoeppritz impedance

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] The present invention uses the same idea of ​​wave impedance and Connolly elastic impedance, that is, the reflection coefficient is written in the form of a recursive formula. However, the reflection coefficient is replaced by the exact Zoeppritz equation under the condition of plane waves, so that when the reflection coefficient is calculated by Zoeppritz elastic impedance, it is the exact reflection coefficient, not the approximate reflection coefficient of the approximate formula of Aki and Richards. The elastic impedance obtained from the precise reflection coefficient according to the recursive formula is the Zoeppritz elastic impedance (Jinfeng Ma & Igor Morozov, 2005, 2006, 2007).

[0043] The exact formula of the reflection coefficient (Zoeppritz equation) can be expressed as:

[0044] R i ( ...

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Abstract

The invention provides a method for carrying out reservoir prediction by using Zoeppritz impedance. The method comprises the following steps of: comparing Zoeppritz with other types of elastic impedances; calculating Zoeppritz elastic impedances along rays or the same angle according to an accurate formula of a Zoeppritz reflection coefficient; carrying out detailed interpretation and square waves on well data so as to conveniently eliminate an accumulated error formed by utilizing the well data and calculating the Zoeppritz elastic impedances; utilizing an accurate reflection coefficient to calculate an artificially synthesized seismographic record and a demarcated horizon; and for seismographic data, improving a signal to noise ratio of the seismographic data by overlapping within a small-angle range or a ray range. According to the method provided by the invention, a plurality of assumptions of the elastic impedances based on Aki and Richards approximate formulas are overcome, and the precision of forward and inversion of the elastic impedances is improved. Furthermore, a matching relation between low and medium frequency components and a high frequency in a seismic inversion is clearly explained.

Description

Technical field: [0001] The patent of the present invention relates to the field of seismic inversion, and is used for reservoir prediction using seismic exploration data, in particular to a method for reservoir prediction using Zoeppritz impedance. Background technique: [0002] In 1999, Patrick Connolly of the British BP company combined wave impedance inversion technology and AVO technology and first proposed the concept of elastic impedance EI (Flastic Impedance) inversion (Connolly, 1999), thus bringing seismic inversion technology into the world. a new field. However, with the in-depth research and gradual application of elastic impedance, people found that EI itself has many shortcomings and deficiencies (Whitcombe & Connolly, 2001; Ma Jinfeng, 2003; Jinfeng Ma, 2003, 2004; Santos and Tygel, 2004). In Patrick Connolly's theory of elastic impedance, it is assumed that the velocity ratio of longitudinal and shear waves on the entire seismic section is constant, and the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 马劲风
Owner NORTHWEST UNIV