岩性油气藏 ›› 2017, Vol. 29 ›› Issue (4): 124–130.doi: 10.3969/j.issn.1673-8926.2017.04.015

• 技术方法 • 上一篇    下一篇

不同脆性岩石的声发射特征

赵万春1, 马云朋1, 王婷婷2, 程东3, 陈艳秋1, 冯笑含1   

  1. 1. 东北石油大学 石油工程学院, 黑龙江 大庆 163318;
    2. 东北石油大学 电气信息工程学院, 黑龙江 大庆 163318;
    3. 渤海钻探工程有限公司工程技术处, 天津 300457
  • 收稿日期:2017-02-13 修回日期:2017-04-06 出版日期:2017-07-21 发布日期:2017-07-21
  • 第一作者:赵万春(1978-),男,博士,教授，博士生导师,主要从事油气井工程力学方面的教学与研究工作。地址:(163318)黑龙江省大庆市高新技术开发区学府街99号东北石油大学石油工程学院。Email:zhaowanchun520@163.com。
  • 基金资助:
    国家自然科学基金项目“页岩气藏压裂岩体突变特征及多重分形缝网逾渗演化研究”（编号：51404073）、国家自然科学基金项目“页岩局部脆性表征与压裂裂缝交互耦合演化机制研究”（编号：51574088）、中国博士后科学基金项目“页岩气藏压裂介观逾渗系统演化与气体流动机理研究”（编号：2014M550180）、中国博士后科学基金特别资助项目“页岩压裂岩体局部脆性破裂与缝网演化多重分形特征研究”（编号：2016T90268）和黑龙江省博士后青年英才计划特别资助项目“煤岩脆塑性表征与岩体压裂突变破裂演化机理研究”（编号：LBH-TZ-0503）联合资助

Acoustic emission characteristics of rocks with different brittleness

ZHAO Wanchun1, MA Yunpeng1, WANG Tingting2, CHENG Dong3, CHEN Yanqiu1, FENG Xiaohan1   

  1. 1. School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. School of Electrical Engineering & Information, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    3. Department of Engineering Technology, Bohai Drilling Engineering Co., Ltd., Tianjin 300457, China
  • Received:2017-02-13 Revised:2017-04-06 Online:2017-07-21 Published:2017-07-21

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摘要： 目前针对岩石声发射的试验主要集中在研究岩石的力学特性方面，关于岩石脆性的声发射试验相对较少。为了研究岩石脆性的声发射特征，对4种不同脆性的岩石试样进行了单轴压缩和声发射检测试验，所用试样为含砂比不同的自制水泥砂石，试验得到了试样的应力-应变曲线和声发射计数曲线。结果表明：试样中的含砂比与岩石脆性正相关；脆性越强，应力-应变曲线的弹性变形段斜率越大，峰后应力跌落越快，形变量越大，出现明显声发射信号的时间越早，声发射计数的最大值越大；峰前声发射计数曲线显示，随着岩石脆性的增加，试样破裂方式由渐进式破裂向突发式破裂过渡，裂缝形态由张性裂缝向剪性裂缝及混合裂缝转变。整体而言，岩石脆性不同，声发射特征也不同，根据声发射特征可以判断岩石脆性的强弱。该试验结果对于评价岩石脆性及水力压裂选层方案设计等具有理论参考价值和现实意义。

关键词: 储层特征, 成岩作用, 致密油, 阿尔善组, 额仁淖尔凹陷, 二连盆地

Abstract: Current researches on acoustic emission test of rock are mostly focused on the mechanical properties of rock,and the acoustic emission test of rock brittleness is relatively a few. The uniaxial test and acoustic emission tests were carried out on four kinds of rock samples with different brittleness which are cement mortar rocks with different sand ratio,so as to obtain the stress-strain curves and the acoustic emission count curves. The result shows that the sand ratio of samples is positively related with rock brittleness. The greater the rock brittleness is,the greater the slope of the elastic deformation section is,the faster the stress drops and the larger the strain is after the peak on the stress-strain curves. On the acoustic emission count curves,the more brittle the rock sample is,the earlier the time that acoustic emission signal appears and the greater the maximum value of the acoustic emission count is. The acoustic emission count curves before the peak show that with the increase of rock brittleness,the fracture mode of samples transits from progressive fracture to burst fracture,and the fracture morphology of samples is changed from tensile crack to shear crack and mixed cracks. Overall,rocks with different brittleness have different acoustic emission characteristics,so acoustic emission characteristics can be used to judge the rock brittleness. This test result has theoretical reference value and practical significance for the evaluation of rock brittleness and hydraulic fracturing scheme design.

Key words: reservoir characteristics, diagenesis, tight oil, A'ershan Formation,Erennao'er Sag, Erlian Basin

中图分类号: 

  • P584
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