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Method for building parallel fracture equivalent medium model

A technology of equivalent medium model and fractured medium, which is applied in instruments, geophysical measurements, soil material testing, etc., and can solve problems such as inconvenience of use, narrow applicable range of the Hudson model, and difficulty in flexibility measurement.

Active Publication Date: 2018-10-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the second-order Hudson model has a relatively narrow scope of application
The Schoenberg&Sayers crack model uses the flexibility coefficient to describe the equivalent elastic properties of the fractured medium. However, it is difficult to measure the flexibility in practice, and the stiffness coefficient is often used to describe the elastic properties of the material in engineering, so the Schoenberg&Sayers crack model is inconvenient to use.

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  • Method for building parallel fracture equivalent medium model
  • Method for building parallel fracture equivalent medium model
  • Method for building parallel fracture equivalent medium model

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Embodiment 1

[0068] figure 1 It is a flowchart of a method for establishing an equivalent medium model of parallel fractures according to an embodiment of the present invention.

[0069] The method may include the steps of:

[0070] (1) Establish the average strain of heterogeneous rocks containing matrix and inclusions the expression.

[0071] Inhomogeneous rocks usually contain matrix material and inclusion material (ie, inclusions). According to the back stress method of materials science, the strain around the inclusion material is the average strain of the matrix of the matrix material, so the average strain in the inhomogeneous rock can be obtained The expression is:

[0072]

[0073] Among them, f m , f r are the contents of the matrix and inclusions in the unit medium, respectively, ε m , ε r are the strains of the matrix and inclusions, respectively, r is the sequence number of the inclusions, and n is the number of types of inclusions contained.

[0074] (2) Establi...

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Abstract

The invention discloses a method for building a parallel fracture equivalent medium model. The method comprises the steps of establishing an expression for the average strain ave(epsilon) of an inhomogeneous rock containing a matrix and an inclusion; establishing an expression for the average stress ave(sigma) in the inhomogeneous rock containing the matrix and the inclusion; obtaining a formula for calculating the fracture medium equivalent elastic modulus ave(Ceff) based on a relation between the matrix stress and the inclusion stress and a relation between the matrix strain and the inclusion strain; and converting the fracture medium equivalent elastic modulus ave(Ceff) into a six-order symmetric fracture medium equivalent elastic matrix. Compared with the existing parallel fracture equivalent medium model, the model built according to the invention has the advantages of wide application range and convenient use.

Description

technical field [0001] The invention relates to the technical field of oil and gas geophysics, and more specifically, relates to a method for an equivalent medium model of parallel fractures. Background technique [0002] Fractured reservoir is a widely existing type of oil and gas reservoir, and it is a hot spot and difficulty in oil and gas exploration and development at present. Establishing an accurate equivalent medium model of fractures is one of the key issues for this type of reservoir. [0003] For parallel fractures, there are currently Hudson equivalent medium model and Schoenberg&Sayers fracture model in geophysics. The Hudson model regards the fracture as a very flat ellipsoid, and uses the elastic perturbation theory to give the relationship between the elastic coefficient of the equivalent anisotropic medium of the fracture, the stiffness coefficient of the isotropic background medium, and the fracture parameters. The Schoenberg&Sayers model regards the frac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00G01N33/24
CPCG01N33/24G01V9/00
Inventor 刘炯季玉新陈天胜
Owner CHINA PETROLEUM & CHEM CORP
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