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本文对陕甘宁盆地上古生界天然气泥质岩直接盖层的毛管压力曲线特征进行了研究。实验过程连续施加压力至３００ＭＰａ，所获孔喉中值直径、中值压力、变异系数、喉道半径、频率分布及其渗透率贡献等参数都表明，泥质岩直接盖层具有中等以上的封闭天然气的能力，具有孔喉中值直径与最大进汞饱和度呈正比；与中值压力和变异系数呈反比的特点。
In this paper, capillary pressure curves of direct caprock of natural gas argillaceous rocks in the Upper Paleozoic of the Shanxi-Gansu-Ningxia Basin were studied. The continuous application of pressure to 300 MPa during the experiment showed that the median pore-throat diameter, median pressure, coefficient of variation, throat radius, frequency distribution and their contribution to permeability all indicate that the direct caprock of mudstone has a medium- The ability of natural gas to have a pore-throat median diameter proportional to the maximum mercury saturation, inversely proportional to the median pressure and coefficient of variation.