Distinct element modeling of hydraulically fractured Lac du Bonnet granite
Distinct element modeling of hydraulically fractured Lac du Bonnet granite
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DOI：
10.1029/2004jb003297
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发表时间：
2005-06
影响因子：
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通讯作者：
A. Al-Busaidi;J. Hazzard;R. P. Young
中科院分区：
文献类型：
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作者：
A. Al-Busaidi;J. Hazzard;R. P. Young
[1]这项研究的目的是为了更好地了解水力压裂过程中裂缝发育和扩展的机理。本文介绍了离散粒子模型在这一问题上的发展和应用。不连续介质建模方法将材料理想化为在其接触点结合在一起的单独粒子，并利用单个结构单元或键的断裂来表示损伤。数值模型与现有的水压压裂实验室实验相关联，这些实验已在其他出版物中介绍。利用实验室规模的水力压裂实验模拟和实验获得的声发射(AE)数据来验证在水力压裂模型中产生的合成声发射。这项技术已被用于研究裂缝的起裂机理和声发射的时间和空间分布。模拟结果表明，Lac Du Bonnet(LdB)花岗岩岩芯样品的水力诱导断裂机制主要是拉伸破坏，水压断裂实验中记录的剪切裂缝是由于在原有裂缝上滑动造成的。均质和非均质合成样品上的水力压裂数值模拟似乎捕捉到了实验室水力压裂实验中观察到的大部分行为。
[1] The aim of this study is to better understand the mechanics of fracture development and propagation during hydraulic fracturing. This paper presents some development and applications of discrete particle modeling of this problem. A discontinuum modeling approach idealizes the material as separate particles bonded together at their contact points and utilizes the breakage of individual structural units or bonds to represent damage. The numerical models are correlated with existing hydrofracture laboratory experiments, which are presented in other publications. A simulation of a laboratory-scale hydrofracture experiment and the acoustic emission (AE) data from the experiment is used to validate the synthetic AEs produced in the hydrofracture model. This technique has been used to examine the mechanics of fracture initiation and time and spatial distributions of AE. The modeling results demonstrate that the mechanism of hydraulically induced fracture in the Lac du Bonnet (LdB) granite core sample is predominantly tensile failure and that the shear cracks recorded in the hydrofracture experiment were due to slip on preexisting fractures. Numerical modeling of hydrofracture on homogeneous and heterogeneous synthetic samples seems to capture much of the behavior observed in the laboratory hydrofracture experiments.