天然气地球科学 ›› 2020, Vol. 31 ›› Issue (8): 10921098.doi: 10.11764/j.issn.1672-1926.2019.10.013
Kai ZHANG1,2(),Dong-hui LI1,2(),Yan-xia LIANG1,2
摘要:
煤的孔隙率是表征煤储层瓦斯富集程度的重要指标,对煤层气资源的开发至关重要。为了提高煤层气的开采和利用,且更好地研究煤储层的孔隙率。采用河南焦作古汉山矿原煤标准煤样,将煤样加工为平行于面割理、垂直于面割理和垂直于层理共3个方向,采用河南理工大学瓦斯地质研究所自制煤储层压裂模拟及物性特征实验系统,对每组煤样同步进行超声波特征和应力—应变测试实验,将所测得的品质因子、孔隙率和轴压进行两两拟合,并对其结果进行讨论。结果表明:在保持围压不变的情况下,煤样的孔隙率随轴压的增大呈线性趋势减小,并且不同方向的孔隙率压力影响系数表现出明显的各向异性;超声波在煤样中传播时,品质因子随轴压的增大而增大,且能量衰减有明显的层理效应;随着加载过程中轴压的增大,品质因子与孔隙率满足较好的线性关系,为利用纵波品质因子预测煤层的孔隙率提供了有效依据。
中图分类号:
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