氩离子抛光-场发射扫描电镜在煤纳米孔研究中的应用  

The application of argon ion polishing-field emission scanning electron microscopy to the research on coal nanopores

作　　者：毛潇潇[1] 赵迪斐[2,3] 卢晨刚 李刚[2] 郭晓宇[2] 郭英海[2,3] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京昌平102200 [2]中国矿业大学资源与地球科学学院,江苏徐州221116 [3]煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《电子显微学报》2016年第1期90-96,共7页Journal of Chinese Electron Microscopy Society

基　　金：山西省煤基重点科技攻关项目(No.MQ201402);煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目(No.2015-007);中国矿业大学大学生创新训练项目(No.201517);中国矿业大学资源与地球科学学院科研训练项目(No.201504)

摘　　要：随着煤层气勘探开发与二氧化碳地下储存技术的发展,煤储层微观孔隙结构的研究逐渐向纳米级别深入。以太原组无烟煤为例,率先采用氩离子抛光-场发射扫描电镜技术直接观测煤纳米孔,为煤储层微观储渗结构的观测提出一种新的研究方法。结果表明,煤储层孔隙主体处于纳米级别,分别发育在炭质、颗粒矿物、粘土矿物内部及接触部位,类型多样,以炭质内部的纳米孔最为发育;孔径差异显著,孔径主体分布范围为10～700 nm,集中在50～100 nm;孔隙形貌特征复杂、连通性不均一。氩离子抛光-场发射扫描电镜在煤微观孔隙系统分类及微观结构辅助定性-定量表征两方面具有广阔运用前景。With the development of coalbed methane exploration and carbon dioxide underground storage technology,the research on microscopic pore structure in coal reservoir gradually goes deeply into nanoscale. Based on field-emission SEM in combination with argon ion beam cross-section technology,the nanopores in anthracite coal from Taiyuan Formation were observed directly at the first time,offering a new alternative method for micro structural investigation in coal reservoir. The results show that the pores in coalbed reservoir mainly exist at nanoscale and located in carbon-based matters,quartz,clay mineral particles and junction formed by detrital grains,among which the pores in carbon-based matters are the most significant. The sizes of the pores are significantly different,ranging from 10 to 700 nm and mainly from 50 to 100 nm. The pore morphology is complicated with an inhomogenous connectivity. The argon ion polishing-field emission scanning electron microscope（ FE-SEM） technology has a broad application prospect in both qualitative and quantitative characterization of auxiliary coal micro-structure as well as classification of microscopic pore system.

关 键 词：煤纳米孔 结构特征 氩离子抛光 扫描电镜 

分 类 号：TE37[石油与天然气工程—油气田开发工程]