| 四川盆地南缘五峰-龙马溪组海相页岩压缩变形试验与破裂模式研究 |
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| 作者姓名： | 徐添阳 琚宜文 黄骋 戚宇 朱洪建 |
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| 作者单位： | 中国科学院大学地球科学学院 中国科学院计算地球动力学重点实验室, 北京 100049 |
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| 基金项目： | 国家自然科学基金（41530315，41372213）、国家科技重大专项（2016ZX05066003，2016ZX05066006）和中国科学院战略性先导科技专项（XDA05030100）资助 |
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| 摘 要： | 页岩气勘探开发的关键是通过储层压裂技术形成大规模的裂隙网络，评价页岩储层可改造性是储层压裂技术的基础，岩石力学和变形特性与储层可改造性关系密切。在四川盆地南缘五峰-龙马溪组海相页岩宏微观特征观测的基础上，通过页岩单轴压缩变形试验，获得其岩石力学参数，结合所得应力-应变曲线及破裂形态分析，结果表明：页岩抗压强度和杨氏模量相对偏低、脆性特征显著；页岩具有单斜面剪切破裂及劈裂式破裂两种模式，其破裂模式决定于页岩层理和加载方向；页岩岩石力学性质与破裂模式受诸多因素影响，非均质性是其中最重要的影响因素。
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| 关 键 词： | 页岩 压缩变形试验 岩石力学参数 破裂模式 四川盆地南缘 |
| 收稿时间： | 2017-04-14 |
| 修稿时间： | 2017-05-16 |
Compression deformation test and rupture mode study of the marine shales from Wufeng-Longmaxi Formations in the southern margin of Sichuan Basin |
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| Authors: | XU Tianyang JU Yiwen HUANG Cheng QI Yu ZHU Hongjian |
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| Institution: | Key Lab of Computational Geodynamics of Chinese Academy of Sciences, College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The key to shale gas exploration and exploitation is to form a large-scale fracture network through fracturing technology. The technology is based on the friability evaluation of shale reservoirs, which is closely related to the rock mechanics and deformation characteristics. Based on the observation of the macro and micro characteristics of the marine shales from Wufeng-Longmaxi Formations in the southern margin of Sichuan Basin, we obtained its rock mechanical parameters through uniaxial compression deformation tests. By combining the stress-strain curves and analysis of rupture morphology, we obtain the results as follows. The shale shows relatively low compressive strength and Young's modulus, and has significant brittle characteristics. The shale has two rupture modes, single cant shear rupture and splitting rupture, which are decided by the bedding and loading directions. The mechanical properties and rupture modes of shale are influenced by many factors, among which the heterogeneity is the most important. |
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| Keywords: | shale compression deformation test rock mechanical parameters rupture mode southern margin of Sichuan Basin |
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