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A Characterization Method of Fracture Surface Roughness Anisotropy

A technology of surface roughness and anisotropy, which is applied in the field of anisotropy characterization of fracture surface roughness, can solve problems such as inability to fully analyze the anisotropy characteristics of structural surfaces, and achieve strong operability, low prediction cost, and high practicality value effect

Inactive Publication Date: 2020-03-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Few scholars have unified the anisotropy and size effect characteristics of structural planes for research, so it is still not possible to fully analyze the anisotropy characteristics of structural planes and accurately grasp its size effect.

Method used

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  • A Characterization Method of Fracture Surface Roughness Anisotropy
  • A Characterization Method of Fracture Surface Roughness Anisotropy
  • A Characterization Method of Fracture Surface Roughness Anisotropy

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specific Embodiment approach

[0041] The patent of the present invention takes the reservoir fracture surface of the Chang 7 Member in the Dingbian area of ​​the Ordos Basin as an example to illustrate the specific implementation process of the present invention.

[0042] The Ordos Basin is located in the west of the North China Block. It is a large inland depression developed on the basis of the Paleozoic platform and formed during the Indosinian-Yanshanian Movement. Generally speaking, the structure in the basin is stable, the margin is relatively active, and it has the characteristics of uplift in the south and north, thrust in the west, and uplift in the east. According to this, it can be divided into six structural units: Yimeng uplift, Weibei uplift, and west margin uplift. Thrust belt, Tianhuan depression, Yishan slope and Jinxi flexure belt.

[0043] The Ordos Basin experienced multiple tectonic movements, which can be divided into five stages: the Aola Valley developed in the Middle and Late Prote...

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Abstract

The invention relates to the field of petroleum geology and geotechnical engineering, in particular to a fracture surface roughness anisotropy characterization method. Methods and devices of a rock surface topography instrument, a contact punch instrument, a digital surface roughness measuring instrument, a photograph measurement method, a three-dimensional laser scanner and the like are used forobtaining three-dimensional information data of a fracture surface; by building fracture surface roughness evaluation units of different directions and a standard joint profile database, a fracture surface cross-scale evaluation model is built, and characterization of the fracture surface roughness anisotropy is achieved. According to the fracture surface roughness anisotropy characterization method, by building a corresponding mathematical algorithm, programmed characterization of the fracture surface roughness anisotropy is achieved, the fracture surface roughness anisotropy characterizationmethod has a high application value, moreover, the prediction cost is low, the operability is high, large labor and financial resource expenditure can be reduced, and a prediction result has important significance in multiple aspects of evaluating application of the mechanical property of the fracture surface in engineering practice, petroleum geology and the like.

Description

technical field [0001] The invention relates to the fields of petroleum geology and geotechnical engineering, in particular to a method for characterizing the anisotropy of crack surface roughness. Background technique [0002] The roughness of the fracture will affect the stress and strain distribution of the fracture; the fracture (joint) roughness coefficient (JRC) is the quantitative description parameter JRC, value of the geometric shape of the rock fracture surface. Barton and Choubey (1977) proposed a standard roughness grade profile curve based on a large number of model tests and field observations. The curve divides the JRC value into 10 intervals, ranging from 0≤JRC≤20. In practical applications, the actual structural surface profile curve is compared with the standard roughness grade profile curve to determine the JRC value. At present, the three-dimensional surface topography of cracks is usually measured by CT three-dimensional scanning, laser three-dimension...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/30
CPCG01B21/30
Inventor 刘敬寿
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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