3D characterization of porosity and minerals of low-permeability uranium-bearing sandstone based on multi-resolution image fusion

作     者：Bing Sun Shan-Shan Hou Sheng Zeng Xin Bai Shu-Wen Zhang Jing Zhang Bing Sun;Shan-Shan Hou;Sheng Zeng;Xin Bai;Shu-Wen Zhang;Jing Zhang

作者机构：School of Civil EngineeringUniversity of South ChinaHengyang 421001China School of Resource Environment and Safety EngineeringUniversity of South ChinaHengyang 421001China School of Resources and Safety EngineeringCentral South UniversityChangsha 410083China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2020年第31卷第10期

页      面：115-134页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：This work was supported by the National Natural Science Foundation of China(No.11775107) the Key Projects of Education Department of Hunan Province of China(No.16A184) 

主　　题：Low-permeability uranium-bearing sandstone Digital core Micro-CT SEM–EDS Image fusion 

摘      要：In the process of in situ leaching of uranium,the microstructure controls and influences the flow distribution,percolation characteristics,and reaction mechanism of lixivium in the pores of reservoir rocks and directly affects the leaching of useful *** this study,the pore throat,pore size distribution,and mineral composition of low-permeability uranium-bearing sandstone were quantitatively analyzed by high pressure mercury injection,nuclear magnetic resonance,X-ray diffraction,and wavelength-dispersive X-ray *** distribution characteristics of pores and minerals in the samples were qualitatively analyzed using energy-dispersive scanning electron microscopy and multi-resolution CT *** registration with the landmarks algorithm provided by FEI Avizo was used to accurately match the CT images with different *** multi-scale and multi-mineral digital core model of low-permeability uranium-bearing sandstone is reconstructed through pore segmentation and mineral segmentation of fusion core scanning *** results show that the pore structure of low-permeability uranium-bearing sandstone is complex and has multi-scale and multi-crossing *** intergranular pores determine the main seepage channel in the pore space,and the secondary pores have poor connectivity with other *** and coffinite are isolated from the connected pores and surrounded by a large number of clay minerals and ankerite cements,which increases the difficulty of uranium *** and a large amount of ankerite cement are filled in the primary and secondary pores and pore throats of the low-permeability uraniumbearing sandstone,which significantly reduces the porosity of the movable fluid and results in low overall permeability of the *** multi-scale and multi-mineral digital core proposed in this study provides a basis for characterizing macroscopic and microscopic pore-throat structures and mineral distributions of low-permea