陕甘宁盆地上古生界天然气泥质岩直接盖层的毛管压力封闭特征  

The Seal Characteristics of Capillary Pressure of Direct Argnlaceous Cap Rocks for Natural Gas from Paleozoic in Shanganning Basin

作　　者：刘文彬[1] 李节通 伏万军 

机构地区：[1]中国科学院兰州地质研究所,南海西部石油公司勘探开发科学研究院

出　　处：《沉积学报》1996年第1期80-85,共6页Acta Sedimentologica Sinica

基　　金：甘肃省自然科学基金

摘　　要：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。Study on the characteristics of capillary pressure curves of direct argillaceous cap rocks for natural gas from paleozoic in shanganning Basin was carried out in this paper. The parameters,which have been obtained in the process of experiment, show that the direct argillaceous cap rock has above medium power to seal natural gas. Those parameters are the pore throat median diameter, median pressure, change coefficient of the frequency distribution of pore throat and the pemeability contribution. The results also show that the pore throat median diameter is proportional to the maximum mercury saturation, but disproportional to the median pressure and the change coefficient.

关 键 词：毛管压力 天然气 泥质岩 盖层 陕甘宁盆地 封闭 

分 类 号：P618.130.2[天文地球—矿床学]