太原理工大学学报Issue(4)：405-409,5.DOI:10.16355/j.cnki.issn1007-9432tyut.2015.04.008
基于显微 CT 和造影剂的砂岩静水压力细微成像初步研究
Microscopic Imaging of the Sandstone Under Hydrostatic Pressure and Its Preliminary Analysis Based on the Micro-CT and Medical Imaging Agents
摘要
Abstract
This paper aims at clearly identifying the changes of sandstone core’s inner struc‐ture under hydrostatic pressure ,and obtaining a quantitative description to conduct in‐depth stud‐y of the permeability of sandstone .The medical injection meglumine was used as the imaging a‐gent of sandstone permeation ;CT image at different levels was rebuilt by scanning the permeation of sandstone under different hydrostatic pressures with high‐accuracy micro‐CT .By analyzing the attenuation coefficient of the scanned samples ,the quantitative analysis of the microscopic struc‐ture and permeation process of the sandstone was achieved .The experimental results indicate that ,first ,imaging agent as permeation fluid can more clearly distinguish the permeation state . Secondly ,in the diameter direction of the sample ,the external CT values exhibit a nearly linear increase with hydrostatic pressure ,and the permeation is more prone to occur ;the internal CT values increase exponentially . Thirdly ,CT values significant decreases when the hydrostatic pressure is more than 15 M Pa ,and the permeation is less likely to take place .It illustrates that at this pressure ,permeation fluid saturates the pore of sandstone ,and further increase in pressure re‐sulfs in less increases in water content in pores .关键词
显微CT/造影剂/静水压力/砂岩/渗流过程Key words
micro-CT/medical imaging agent/hydrostatic pressure/sandstone/permeation procedure分类
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..基于显微 CT 和造影剂的砂岩静水压力细微成像初步研究[J].太原理工大学学报,2015,(4):405-409,5.基金项目
国家自然科学基金资助项目固-热-水气两相流耦合作用下煤层气解吸运移机理研究（51304142），煤吸附／解吸甲烷过程的能量迁移及其控制作用机理研究 （）
