岩性油气藏 ›› 2017, Vol. 29 ›› Issue (4): 124130.doi: 10.3969/j.issn.1673-8926.2017.04.015
赵万春1, 马云朋1, 王婷婷2, 程东3, 陈艳秋1, 冯笑含1
ZHAO Wanchun1, MA Yunpeng1, WANG Tingting2, CHENG Dong3, CHEN Yanqiu1, FENG Xiaohan1
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。
中图分类号:
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