页岩细观矿物条带对其宏观破坏模式的影响研究

doi:10.13722/j.cnki.jrme.2020.0724

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摘要阐明页岩初始结构特征、破裂演化规律和破坏模式形成机制，对页岩气储层改造至关重要。鉴于此，开展单轴压缩条件下页岩的在位微米CT试验，研究页岩内部结构特征及其对页岩破裂演化和破坏模式的影响规律。基于试验结果，描述页岩在单轴压缩条件下的内部结构变化，分析基于裂纹体积的页岩破裂演化阶段，量化破坏页岩的三维裂纹发育程度和连通情况，在此基础上，归纳页岩在单轴压缩条件下的2种破坏模式，分析页岩细观矿物分布特征及其对破坏模式的影响。除此之外，根据CT图像识别的矿物分布规律，开展含矿物条带数值试样的单轴压缩模拟试验，揭示矿物条带对页岩破坏模式的影响机制。相关研究成果对页岩破裂机制和矿物增渗机制研究具有重要的参考价值，对页岩气开采方案优化设计具有明确的指导意义。

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	段永婷1
	冯夏庭1
	李晓2
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关键词 ：岩石力学, 页岩, 细观尺度, 破裂演化, 破坏模式, 矿物条带

Abstract：It is crucial for shale gas reservoir reconstruction to clarify the initial structure characteristics，the fracturing evolution rule and the formation mechanism of failure modes for shale. In view of this，in this paper，the in-situ micro-CT tests of shale under uniaxial compression condition are carried out，and the internal structure characteristics of shale and the its influence on shale fracturing evolution and failure mode are studied. Based on the test results，the internal structure change of shale under uniaxial compression condition is described，the fracturing evolution stage of shale based on the crack volume is analyzed，and the development degree and connectivity of 3-D cracks in failure shale are quantified. On this basis，two failure modes of shale under uniaxial compression condition are summarized，and the distribution characteristics of meso-scale minerals and their influence on failure modes of shale are analysed. In addition，according to the mineral distribution identified by CT images，the uniaxial compression simulation tests of numerical samples containing mineral bands are carried out，and the influence mechanism of mineral bands on shale failure modes are revealed. Relevant research results have important reference value for study of shale fracturing mechanism and mineral permeability-increasing mechanism of reservoir shale，and have clear guiding significance for the scheme optimal design of shale gas exploitation.

Key words： rock mechanics shale mesoscopic scale fracturing evolution failure mode mineral band

引用本文:

段永婷1，冯夏庭1，李晓2，3，4. 页岩细观矿物条带对其宏观破坏模式的影响研究[J]. 岩石力学与工程学报, 2021, 40(1): 43-52.
DUAN Yongting1，FENG Xiating1，LI Xiao2，3，4. Study on the influence of meso-mineral bands on macroscopic failure modes of shale. , 2021, 40(1): 43-52.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0724 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I1/43

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