A rock fracture complexity characterization method based on fractal dimension
A technology with a high degree of complexity and fractal dimension, applied in the fields of seismology, analytical materials, earth cube drilling and mining for logging records, etc., it can solve problems such as single division method and inability to accurately reflect rock fracture patterns
Inactive Publication Date: 2019-06-25
SOUTHWEST PETROLEUM UNIV +1
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[0002] Fractures of shale rocks are generally divided into three types, namely, tensional splitting failure, multi-fracture shear failure and single-fracture shear failure. Fracture form, because the rock fracture form is often not a single mode of absolute tensional splitting or single fracture shearing, but a complex fracture form in which multiple failure modes coexist, and the complexity of rock fracture in different degrees of single fracture mode Therefore, it is necessary to accurately characterize the rock fracture pattern in order to correctly understand the characteristics of the rock fracture pattern and analyze the influencing factors of the fracture pattern
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[0019] The invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0020] A method for characterization of rock fracture complexity based on fractal dimension of the present invention comprises the following steps:
[0021] Step A, collect the rock fracture sample, and collect the basic parameters of the rock, and its basic parameters include the fracture angle, Poisson's ratio, Young's modulus, peak strain, and peak stress of the rock;
[0022] Step B, use the box method to determine the fractal dimension of the rock fracture shape, specifically put the rock fracture end face in a square area of a certain length, divide the square into boxes with side length R, and obtain different values by changing the value of R The number of boxes containing cracks N(R) in the case;
[0023] Step C, calculate the fractal dimension of rock by following formula again:
[0024]
[0025] In the formula: N(R) is the number o...
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The invention discloses a fractal dimension-based rock fracture complexity characterization method, which comprises the following steps of: collecting a rock fracture sample, and collecting basic parameters of rock; Determining a rock fracture form fractional dimension; Calculating the fractal dimension of the rock; calculating the rock fracture complexity coefficient Fc; and finally, characterizing the rock fracture complexity according to the rock fracture complexity coefficient Fc. According to the method, the fractal geometry theory is combined, the shale rock fracture complexity coefficient is redefined and calculated, the rock fracture form is accurately represented, the characteristics of the rock fracture form are correctly known, and the influence factors of the fracture form areanalyzed.
Description
technical field [0001] The invention relates to a method for characterizing the complexity of rock fracture based on fractal dimension. Background technique [0002] Fractures of shale rocks are generally divided into three types, namely, tensional splitting failure, multi-fracture shear failure and single-fracture shear failure. Fracture form, because the rock fracture form is often not a single mode of absolute tensional splitting or single fracture shearing, but a complex fracture form in which multiple failure modes coexist, and the complexity of rock fracture in different degrees of single fracture mode Therefore, it is necessary to accurately characterize the rock fracture pattern in order to correctly understand the characteristics of the rock fracture pattern and analyze the influencing factors of the fracture pattern. Contents of the invention [0003] In order to solve the problems in the prior art, the present invention provides a method for characterizing the ...
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IPC IPC(8): G06F17/50
CPCG01N33/24G01V2210/646G01N2203/0067E21B43/26G01V1/50E21B49/00
Inventor 卢聪郭建春黎俊峰郑云川尹丛彬李美平陈明忠赵志红王琨陈迟袁灿明黄楚淏马莅黄枫岚钟烨
Owner SOUTHWEST PETROLEUM UNIV