煤岩毫米级尺度裂隙网络重构及渗透率预测

发布时间：2018-02-05 00:32

本文关键词： 毫米级裂隙裂隙网络重构渗透率　出处：《煤炭科学技术》2016年08期 　论文类型：期刊论文

【摘要】：为了表征煤中毫米级裂隙的连通性,并得出其渗透性对整个煤的渗透性的影响,通过大量煤样显微镜下观察统计,应用蒙特卡罗方法对毫米级裂隙网络进行重构。采用赋零法并结合Matlab软件得出有效连通裂隙网络;应用二维渗流方程,得出了毫米级裂隙网络有效渗透率。与实测渗透率对比结果表明:煤岩中有效连通的毫米级裂隙网络是渗透率的主要贡献者;其他参数一定的情况下,随着毫米级裂隙密度、宽度的增加,渗透率呈指数型增加。毫米级裂隙长度增加到一定程度后,渗透率几乎不再增加。储层改造中形成新的裂隙或增加裂隙宽度是增加其导流能力的关键。重构的毫米级尺度裂隙网络能够更清晰地显示裂隙的连通性,为煤层气在裂隙网络运移路径选择及流动方式研究奠定了基础。
[Abstract]:In order to characterize the connectivity of millimeter cracks in coal and to obtain the influence of permeability on the permeability of coal, the statistics were observed under a large number of coal samples under microscope. The millimeter crack network is reconstructed by Monte Carlo method, and the effective connected fracture network is obtained by using the zero-setting method and Matlab software. The effective permeability of the millimeter fracture network is obtained by using the two-dimensional seepage equation, and the comparison with the measured permeability shows that the effectively connected millimeter fracture network in coal and rock is the main contributor to the permeability. With the increase of the density and width of the millimeter crack, the permeability increases exponentially. The length of the millimeter crack increases to a certain extent. The permeability is almost no longer increased. The key to increase its conductivity is to form new fractures or increase the width of fractures in reservoir reconstruction. The reconstructed millimeter scale fracture network can more clearly show the connectivity of fractures. It lays a foundation for the study of migration path selection and flow mode of coalbed methane in fracture network.
【作者单位】：河南理工大学能源科学与工程学院;中原经济区煤层(页岩)气河南省协同创新中心;
【基金】：河南省高校科技创新人才支持计划资助项目(15HASTIT050) 河南省科技厅攻关资助项目(142102210050) 河南省教育厅科学技术研究重点资助项目(14A440005)
【分类号】：TD712
【正文快照】： 0引言煤储层渗透率是煤中裂隙发育程度的定量表征参数之一。国内外研究者针对煤储层裂隙与渗透率的关系,进行了卓有成效的研究。通过孔径、渗透率、孔隙度等试验测试,得出裂隙宽度与渗透率的三次方成正比[1-2];裂隙孔隙度与渗透率成正比关系[3-4]。借助分形理论,得出煤体的渗

【相似文献】