基于铸体薄片和CT扫描分析灰岩的微观结构  

Analysis of limestone microstructure based on casting thin sections and CT scanning

作　　者：李海波 LI Haibo(Shanxi Huajin Jining Coal Industry Co.,Ltd.,Linfen,042100,China)

机构地区：[1]山西华晋吉宁煤业有限责任公司,山西临汾042100

出　　处：《华北科技学院学报》2023年第6期83-89,共7页Journal of North China Institute of Science and Technology

摘　　要：煤系地层灰岩是煤炭资源中常见的一种岩石类型,具有重要的地质和工程意义。本文采用CT扫描和铸体薄片相结合的方法,对灰岩的微观结构进行了分析。铸体薄片提供了岩石的显微镜下的细节特征,而通过CT扫描图像获取了岩石的三维内部结构信息,并计算了所测岩心的孔隙度,连通度,孔隙直径等一系列参数。通过综合分析这两种数据,对灰岩的孔隙结构、矿物组成和微观结构进行了深入研究。研究发现该地区灰岩主要是细粉晶白云石为主,次为方解石,泥质以粘土矿物为主。岩石构造缝发育,交织成网状,在孔隙分布不均匀,连通性差,同一个方向非均质性较低。通过CT扫描测量的孔隙范围4.37%~9.66%,连通度较高,通过将这两种数据进行对比和关联分析,揭示了灰岩的微观结构特征,进而对其工程性质进行深入理解。Coal measures limestone is a common rock type in coal resources,which has important geological and engineering significance.In this paper,the microstructure of limestone is analyzed by means of CT scanning and casting thin section.The cast thin section provides the detailed characteristics of the rock under the microscope,while the three-dimensional internal structure information of the rock is obtained through the CT scanning image,and a series of parameters such as porosity,connectivity,pore diameter,etc.of the measured core are calculated.The pore structure,mineral composition and microstructure of limestone are studied by comprehensive analysis of these two data.It is found that the limestone in this area is mainly fine-grained dolomite,secondly calcite,and the argillaceous material is mainly clay minerals.The structural fractures of rock are developed and interwoven into a network,with uneven distribution in pores,poor connectivity and low heterogeneity in the same direction.The porosity measured by CT scanning is 4.37%~9.66%,and the connectivity is high.By comparing and correlating the two data,the microstructure characteristics of limestone are revealed,and then the engineering properties are further understood.

关 键 词：CT扫描图像 铸体薄片 灰岩 微观结构 矿物组成 

分 类 号：P588[天文地球—岩石学]