CAJ | 학술논문

为了清楚地识别砂岩岩芯内部在静水压力下结构的变化，并对其进行定量描述，深入研究砂岩的渗透特性，应用医学注射剂泛影葡胺作为砂岩渗流造影剂，通过高精度显微CT 对砂岩不同静水压力下渗流进行扫描，重建了不同层面CT 图像，分析被扫描试件的衰减系数，实现了砂岩显微结构和渗透过程的定量分析。试验结果表明，造影剂作为渗透流体，可更清晰地分辨渗流状态；沿试件直径方向，外部CT 值增量随压力近似呈直线递增，较容易发生渗透，内部则近似呈指数递增；静水压力大于15 M Pa ，C T 值增量明显减少，说明此压力时砂岩孔隙基本达到饱和，再增加压力，其孔隙流体的含量增加就十分微弱。本研究为多孔介质渗流研究提供了新方法。
위료청초지식별사암암심내부재정수압력하결구적변화，병대기진행정량묘술，심입연구사암적삼투특성，응용의학주사제범영포알작위사암삼류조영제，통과고정도현미CT 대사암불동정수압력하삼류진행소묘，중건료불동층면CT 도상，분석피소묘시건적쇠감계수，실현료사암현미결구화삼투과정적정량분석。시험결과표명，조영제작위삼투류체，가경청석지분변삼류상태；연시건직경방향，외부CT 치증량수압력근사정직선체증，교용역발생삼투，내부칙근사정지수체증；정수압력대우15 M Pa ，C T 치증량명현감소，설명차압력시사암공극기본체도포화，재증가압력，기공극류체적함량증가취십분미약。본연구위다공개질삼류연구제공료신방법。
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 .