论文部分内容阅读
利用柔性壁渗透仪对取自兰州地区的砂岩和砂质泥岩试样进行了渗透性能的试验研究,通过施加不同围压和渗透压,比较砂岩与砂质泥岩两者的渗透性能,并根据试验数据对渗透系数与渗透压进行拟合,同时,利用扫描电镜(SEM)对渗透前后的砂岩和砂质泥岩进行微观分析。试验结果表明:在200 k Pa围压时,渗透系数随渗透压增加有增长趋势,在300k Pa、400 k Pa围压时,渗透系数随渗透压增加先增大后保持稳定;在同等围压和渗透压下,砂质泥岩的渗透系数要大于砂岩;根据物理力学性质指标,可通过岩石吸水率和孔隙率对渗透系数进行判定。通过观察电镜结果可知,渗透试验前后,两者内部结构变化较大。
Permeability test of sandstone and sandy mudstone from Lanzhou area was carried out by flexible wall infiltrometer. The permeability of sandstone and sandy mudstone were compared by applying different confining pressure and osmotic pressure. According to the experiment Data were used to fit the permeability coefficient and osmotic pressure. At the same time, the microscopic analysis of sandstone and sandy mudstone before and after infiltration was carried out by scanning electron microscope (SEM). The experimental results show that the permeability coefficient increases with the increase of the osmotic pressure at 200 kPa confining pressure. When the confining pressure is 300 kPa and 400 kPa, the permeability coefficient first increases and then stabilizes with the increase of the osmotic pressure. At the same confining pressure And osmotic pressure, the permeability coefficient of sandy mudstone is larger than that of sandstone. According to physical and mechanical properties, permeability coefficient can be judged by water absorption and porosity of rock. By observing the electron microscopy results, before and after the penetration test, the two internal structure changes.