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Synchronous prediction method for horizontal fractures and vertical fractures of orthogonal medium fracture type reservoir

A technology for horizontal fractures, prediction methods, applied in measurement devices, geophysical measurements, instruments, etc.

Active Publication Date: 2020-05-29
CENT SOUTH UNIV +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for synchronously predicting horizontal fractures and vertical fractures in orthogonal medium fractured reservoirs to solve the problem of fracture prediction

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  • Synchronous prediction method for horizontal fractures and vertical fractures of orthogonal medium fracture type reservoir
  • Synchronous prediction method for horizontal fractures and vertical fractures of orthogonal medium fracture type reservoir
  • Synchronous prediction method for horizontal fractures and vertical fractures of orthogonal medium fracture type reservoir

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Embodiment 1

[0093] see Figure 1 to Figure 7(b) , a method for synchronously predicting horizontal fractures and vertical fractures in fractured reservoirs in orthogonal media, comprising the following steps:

[0094] Step 1: Express the orthotropic disturbance matrix by using the longitudinal and shear wave moduli and the fracture weakness.

[0095] Step 2: Using the scattering function and the disturbance matrix, deduce the linearized longitudinal wave reflection coefficient equation of the orthogonal medium characterized by the modulus of the longitudinal and shear waves, the density and the weakness of the fracture;

[0096] Step 3: Express the linearized P-wave reflection coefficient as a Fourier series expression, and establish a three-step inversion method to estimate the P-wave and S-wave moduli, densities, and fracture weaknesses, so as to realize multi-dimensional analysis of orthotropic media. parameter inversion.

[0097] The three-step inversion method in step three include...

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Abstract

The invention provides a synchronous prediction method for horizontal fractures and vertical fractures of an orthogonal medium fracture type reservoir. The method comprises steps of firstly, expressing an orthotropic disturbance matrix by utilizing longitudinal and transverse wave moduli and fracture weakness; secondly, deriving an orthogonal medium linearized longitudinal wave reflection coefficient equation represented by longitudinal and transverse wave moduli, density and crack weakness by utilizing a scattering function and a disturbance matrix; and lastly, expressing the linearized longitudinal wave reflection coefficient as a Fourier series expression, and establishing a three-step inversion method to estimate longitudinal and transverse wave moduli, density and fracture weakness, and thereby realizing multi-parameter inversion of the orthotropic medium. The method is advantaged in that on the basis of a Scheenberg linear sliding model, that crack weakness with more definite physical significance is directly used for representing the development conditions of horizontal cracks and vertical cracks in an orthogonal medium is proposed; an orthogonal medium longitudinal wave reflection coefficient equation is expressed as a Fourier series form, and crosstalk influence of crack weakness caused by horizontal cracks and crack weakness caused by vertical cracks is reduced.

Description

technical field [0001] The invention relates to the technical field of seismic monitoring, in particular to a method for synchronously predicting horizontal fractures and vertical fractures of orthogonal medium fractured reservoirs. Background technique [0002] Traditional fracture prediction methods are usually based on the assumption of HTI media, that is, the reservoir with high-angle near-vertical fractures is equivalent to HTI media. However, in many sedimentary basins, the reservoirs usually have both high-angle near-vertical fractures and low-angle near-horizontal fractures at the same time. At this time, the HTI assumption will no longer be satisfied, and the orthotropic medium is more suitable for describing such fractures. kind of reservoir. Traditional methods usually use Thomsen anisotropy parameters to characterize the development of horizontal fractures in reservoirs, but the physical meaning of Thomsen anisotropy parameters is mainly to describe the anisotro...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/306G01V2210/624
Inventor 潘新朋李林张广智柳建新崔益安
Owner CENT SOUTH UNIV
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