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Method and system for detecting electrical properties of transverse isotropic rock containing rotary inclined cracks

A transverse isotropic, electrical property detection technology, applied in the field of exploration geophysics

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

AI Technical Summary

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 electrical properties of transverse isotropic rock containing rotary inclined cracks
  • Method and system for detecting electrical properties of transverse isotropic rock containing rotary inclined cracks
  • Method and system for detecting electrical properties of transverse isotropic rock containing rotary inclined cracks

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Embodiment 1

[0077] This embodiment discloses a method for detecting the electrical properties of transversely isotropic rocks containing rotating inclined cracks, such as figure 1 As shown, including the following steps:

[0078] S1 measures the electrical conductivity parameters, where the electrical conductivity parameters include the horizontal conductivity k of the transversely isotropic background rock without cracks x , Vertical conductivity k z , The conductivity of formation water in the fracture k * , Get the background rock conductivity tensor K 0 And the crack conductivity tensor K * , Where, the background rock conductivity tensor K 0 The formula is:

[0079]

[0080] Crack conductivity tensor K * The formula is:

[0081]

[0082] S2 performs CT scanning on the transversely isotropic rock with cracks to obtain the volume content of the cracks φ, the crack aspect ratio α, the angle θ between the cracks and the background isotropic surface, and the rotation angle of the cracks Among th...

Embodiment 2

[0146] Based on the same inventive concept, this embodiment discloses a system for detecting the electrical properties of laterally isotropic rocks with rotating inclined cracks, including:

[0147] Electrical conductivity tensor acquisition module, used to measure electrical conductivity parameters and obtain background rock electrical conductivity tensor K 0 And the crack conductivity tensor K * ;

[0148] Fracture parameter acquisition module, used for CT scanning of transversely isotropic rocks containing fractures to obtain the volume content of the fracture φ, the aspect ratio of the fracture α, the angle θ between the fracture and the background isotropic surface, and the rotation angle

[0149] The conductivity contribution tensor acquisition module is used to characterize the crack shape through the crack aspect ratio α and the angle θ between the crack and the background isotropic surface, and obtain the current The crack shape tensor H when it is zero, and combine the act...

Embodiment 3

[0154] In order to better illustrate the technical solution of the present invention, this embodiment takes the actual formation rock conductivity as an example for description. In this embodiment, the horizontal conductivity k of the background rock is obtained according to the detection result of the rock in a certain formation. x =0.0524S / m, vertical conductivity k z =0.0117S / m, and the crack volume content is set to 0.0025.

[0155] image 3 It is a graph of the changes of the elements in the electrical conductivity tensor of transversely isotropic rocks containing rotating inclined cracks with the inclination angle of the cracks under the four crack rotation angles of 0, π / 8, π / 4, 3π / 8, and π / 2; The ratio is set to 0.001, image 3 (a) is K 11 Graph of change with the inclination angle of the crack; image 3 (b) is K 22 Graph of change with the inclination angle of the crack; image 3 (c) is K 33 The graph of the change with the inclination angle of the crack; image 3 (d) is ...

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Abstract

The invention relates to a method and a system for detecting the electrical property of transversely isotropic rock containing rotary inclined cracks. The method comprise the following steps of measuring conductivity parameters to obtain a background rock conductivity tensor K0 and a crack conductivity tensor K*; performing CT scanning of the transverse isotropic rock containing the cracks; obtaining the volume content phi, the crack aspect ratio alpha, the included angle theta between the cracks and the background isotropic surface and the rotation angle of the cracks, representing the crackshape through the crack aspect ratio alpha and the included angle theta between the cracks and the background isotropic surface, obtaining an oriented crack shape tensor H, and calculating the conductivity contribution tensor A of the cracks according to the crack shape tensor H; and obtaining a transverse isotropic rock conductivity tensor of the rotary inclined cracks based on an electrical sliding theory, and obtaining the rock conductivity according to the conductivity tensor. The method is advantaged in that through rotating the cracks around the vertical axis of the background rock, thesituation of a real crack-containing stratum can be better met, 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 performance of laterally isotropic rocks containing rotating tilt cracks, and belongs to the technical field of exploration geophysics. Background technique [0002] For fractured formations, establishing an appropriate electrical petrophysical model is the basis for the application of electrical exploration to accurately evaluate fracture characteristics. In order to promote the development of electrical exploration technology, researchers have derived many petrophysical models that can characterize the electrical conductivity of fractured rocks. For an isotropic background rock with fractures, when all fractures are parallel, the closed form of the solution of the effective thermal conductivity (which has a similar derivation process and mathematical expression form to the conductivity of the medium) is given by Hatta and Taya. For the thermal conductivity properties of isotropic r...

Claims

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Application Information

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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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