基于三维空间表征的高阶煤连通孔隙发育特征  

Interconnected pore development features of high rank coal based on 3D space characteristics

作　　者：杨延辉 刘世奇[2] 桑树勋[3] Jingsheng Ma 王鑫[5] 王文峰[3] 杨艳磊 

机构地区：[1]中国石油华北油田公司,河北任丘062552 [2]中国矿业大学低碳能源研究院江苏省煤基CO2捕集与地质存储重点实验室,江苏徐州221116 [3]中国矿业大学,资源与地球科学学院煤层气资源与成藏过程教育部重点实验室,江苏徐州221116 [4]赫瑞瓦特大学石油工程学院,英国爱丁堡EH144AS [5]山东省科学院海洋仪器仪表研究所,山东青岛266001

出　　处：《煤炭科学技术》2016年第10期70-76,共7页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41330638,41402135,41272154);江苏省煤基CO2捕集与地质储存重点实验室(中国矿业大学)开放基金资助项目(2015A04);国家重点基础研究发展计划(973计划)资助项目(2009CB219608);中石油重大科技专项资助项目(2013E-2205)

摘　　要：为了探讨高阶煤孔裂隙连通特征,以沁水盆地南部3号无烟煤层为研究对象,基于煤储层结构三维数字化建模方法,构建了煤层多级次孔裂隙网络结构模型并提取了关键参数,同时结合扫描电子显微镜观测,进一步确认了孔裂隙连通关系以及不同成因类型的孔隙对煤储层连通性的贡献。结果表明:高阶煤孔喉细小,以孔径小于50 nm的中孔为主;孔隙迂曲度较低,截面以方形和正三角形为主,毛管阻力较小;孔隙连通性较差,对连通性起主要作用的是孔径小于50 nm的中孔;差异收缩孔是主要的纳米连通孔隙,该孔隙的发育,形成了具有一定网络拓扑性质的渗流网络结构。孔裂隙网络结构模型表征了孔裂隙分布特征与拓扑关系,能够实现煤岩内部空间的数字化、可视化表征。In order to discuss the pore interconnection features of the high rank coal,based on No.3 anthracite seam at the south part of Qinshui Basin as a study object,the 3D digitalized modeling method of the coal reservoir structure was applied to establish the multi grade pore crack network structure model of the seam and to pick up the key parameters. In combination with the observation of the scanning electron microscope,the pore crack interconnection relationship and the contribution of the different origin type pore crack to the coal reservoir interconnection were further confirmed. The results showed that the pore throat of the high rank coal was fine and small and the high rank coal was mainly with the medium pores with a pore diameter less than 50 nm. the tortuosity of the crack was low,the section was mainly with the square and regular triangle and the capillary resistance was low. The interconnection of the crack was poor and the medium pore with the pore diameter less than 50 nm would play the main function to the interconnection. The differential shrinking pores were the main nano interconnected pores. The pore development could form the seepage network structure with a certain network topological property. The pore crack network structure could characterize the pore crack distribution features and topological relationship and could release the digitalized and visualized characteristics of the coal and rock internal space.

关 键 词：无烟煤 连通孔隙 表征技术 数字岩心 沁水盆地 

分 类 号：TD163[矿业工程—矿山地质测量]