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A method for quantitatively calculating the scale of structural fractures in shale

A technology of scale and shale, which is applied in the field of quantitative calculation of the scale of structural fractures in shale, can solve the problems of small range, correlation analysis rarely involved by predecessors, and inability to fully reflect the complete shape of fractures, etc.

Active Publication Date: 2021-09-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] (1) Due to the small range that can be selected for coring or imaging logging, it cannot fully reflect the complete shape of a fracture. The migration and accumulation of oil and gas play an important role, but the traditional method can only hope to obtain complete fractures by accident to determine the scale of fracture development, and cannot make full use of the incomplete fractures in the core.
[0005] (2) Due to the lack of a reasonable estimate of the fracture scale, the correlation analysis between the scale of fracture development and other parameters has rarely been involved in previous studies

Method used

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  • A method for quantitatively calculating the scale of structural fractures in shale
  • A method for quantitatively calculating the scale of structural fractures in shale
  • A method for quantitatively calculating the scale of structural fractures in shale

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Embodiment

[0033] Qualitatively and quantitatively characterize the parameters of structural fractures in shale, establish a mathematical prediction method for the development scale of a single fracture, and improve the calculation of the fracture development scale based on this prediction method. Specifically, the fractures are measured based on the core, and the relevant fracture parameters are corrected, and a suitable fracture model is established by using mathematical methods, and parameter variables are reserved in the model. The actual parameters of a single crack are substituted into the mathematical model to analyze the scale of a single crack. Among them, the complete shape of the crack can be approximated as an ellipsoid, which has a major axis, a minor axis and a minor axis, where the major axis refers to the horizontal extension of the crack, the second major axis refers to the vertical extension of the crack, the minor axis refers to the opening of the crack, and the major a...

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Abstract

The invention discloses a method for quantitatively obtaining the scale of structural fractures in shale. The fractures are measured on the basis of cores, and related fracture parameters are corrected. Then, a fracture model is established in combination with an ellipse fitting method, and parameter variables are reserved in the fracture model. , the actual parameters of the single fracture to be estimated are substituted into the fracture model, and the scale of the single fracture is analyzed. The fracture modeling method centered on ellipse fitting in the present invention can make good use of the data under the premise of fully considering the inherent characteristics of the fracture when the data is limited, dig out the value of the data, and realize the accurate estimation of the scale of the fracture.

Description

technical field [0001] The invention relates to the technical field of structural fracture research, and more specifically relates to a method for quantitatively calculating the scale of structural fractures in shale. Background technique [0002] Abundant shale oil reserves have been found in exploration and development. Structural fractures in shale have an important impact on shale oil migration and accumulation and seepage. For the spatial prediction of fractures, it is necessary to accurately quantitatively characterize the relevant parameters of fractures and determine the stress The relationship between the effect and the fracture type, find the starting position and orientation of the fracture development, measure the opening, density and length of the fracture, etc., and finally analyze and predict the fracture development based on the comprehensive data. At present, the characterization research of reservoir fractures mainly includes three aspects: fracture geologi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F17/18G01V99/00
CPCG01V99/005G06F17/18G06F30/20
Inventor 马存飞曾令鹏詹远杜争利韩文中蒲秀刚
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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