Analysis of limestone microstructure based on casting thin sections and CT scanning
LI Haibo
Abstract：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 scan-ning 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 meas-ured 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 con-nectivity is high.By comparing and correlating the two data,the microstructure characteristics of limestone are revealed,and then the engineering properties are further understood.
Keywords：CT scanning imagecasting slicelimestonemicrostructuremineral composition
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 83-89 )