Method and system for detecting conductivity of transverse isotropic rock containing inclined cracks

A technology of lateral isotropy, detection method, applied in the field of exploration geophysics

Active Publication Date: 2020-07-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing rock conductivity models are difficult to truly reflect the conductivity characteristics of actual rocks

Method used

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  • Method and system for detecting conductivity of transverse isotropic rock containing inclined cracks
  • Method and system for detecting conductivity of transverse isotropic rock containing inclined cracks
  • Method and system for detecting conductivity of transverse isotropic rock containing inclined cracks

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Embodiment 1

[0069] This embodiment discloses a method for detecting the electrical conductivity of transversely isotropic rocks with inclined fractures, such as figure 1 shown, including the following steps:

[0070] S1 measures the electrical conductivity parameters, where the electrical conductivity parameters include the horizontal conductivity k of the transversely isotropic background rock without fractures x , vertical conductivity k z , the conductivity k of the formation water in the fracture * , to obtain the background rock conductivity tensor K 0 and the fracture conductivity tensor K * , where the background rock conductivity tensor K 0 The formula is:

[0071]

[0072] Fracture conductivity tensor K * The formula is:

[0073]

[0074] S2 CT scans the transversely isotropic rock with fractures, and obtains the volume content φ of fractures, the aspect ratio α of fractures, and the angle θ between fractures and the background isotropic plane. Among them, the angle...

Embodiment 2

[0130] Based on the same inventive concept, this embodiment discloses a laterally isotropic rock conductivity detection system with inclined fractures, including:

[0131] The conductivity tensor acquisition module is used to measure the conductivity parameters and obtain the background rock conductivity tensor K 0 and the fracture conductivity tensor K * ;

[0132] The fracture parameter acquisition module is used to perform CT scanning on transversely isotropic rocks containing fractures, and obtain the volume content φ of fractures, the aspect ratio of fractures α, and the angle θ between fractures and the background isotropic plane;

[0133] The conductivity contribution tensor acquisition module is used to characterize the fracture shape through the fracture aspect ratio α and the angle θ between the fracture and the background isotropic surface, and obtain the oriented fracture shape tensor H, and calculate the fracture according to the fracture shape tensor H The cond...

Embodiment 3

[0136] In order to better illustrate the technical solution of the present invention, this embodiment takes the actual formation rock conductivity as an example for illustration. In this embodiment, according to the detection results of the rocks in the formation of a certain place, the horizontal conductivity k of the background rocks is obtained x =0.0524S / m, vertical conductivity k z =0.0117S / m, the fracture volume content is set to 0.0025.

[0137] image 3 for the crack aspect ratio to be 10 -4 , 10 -3 , 10 -2 , 10 -1 Variation of elements in the electrical conductivity tensor of transversely isotropic rocks with inclined fractures with fracture inclination angle. image 3 (a) is K 11 The curve diagram of the change with the inclination angle of the fracture;

[0138] image 3 (b) for K 22 The curve diagram of the change with the inclination angle of the fracture; image 3 (c) is K 23 The curve diagram of the change with the inclination angle of the fracture; ...

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Abstract

The invention relates to a method and system for detecting conductivity of transverse isotropic rock containing inclined cracks. The method comprises the following steps of measuring a conductivity parameter, and obtaining a background rock conductivity tensor K0 and a crack conductivity tensor K*; performing CT scanning of the transverse isotropic rock containing the cracks, and obtaining the volume content phi of the cracks, the crack aspect ratio alpha and the included angle theta between the cracks and the background isotropic surface; representing the crack shape through the crack aspectratio alpha and the included angle theta between the cracks and the background isotropic surface, obtaining an oriented crack shape tensor H, and calculating a conductivity contribution tensor A of the cracks according to the crack shape tensor H; and obtaining a transverse isotropic rock conductivity tensor of the inclined fracture based on an electrical sliding theory, and obtaining the rock conductivity according to the conductivity tensor. The method is advantaged in that the cracks are obliquely crossed with an isotropic surface of the background medium at a certain angle, so the condition of a real crack-containing stratum can be met better, and the conductivity characteristic of the actual rock can be reflected more truly.

Description

technical field [0001] The invention relates to a method and system for detecting the electrical conductivity of transversely isotropic rocks with inclined cracks, and belongs to the technical field of exploration geophysics. Background technique [0002] Electrical prospecting is a common method for evaluating fractured formations. In practical applications, it is necessary to select a suitable electrical rock physics model to establish the relationship between the anisotropic conductivity obtained by electrical survey and the characteristic parameters of formation fractures, so as to accurately evaluate the characteristics of fractures in the formation. The predecessors established many electrical rock physics models to study the electrical properties of fractured rocks. Hashin and Shtrikman's research shows that the electrical conductivity, thermal conductivity and permeability of the medium have similar mathematical expressions, so the expression of electrical conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00Y02A90/30
Inventor 韩同城颜韩
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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