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陕甘宁盆地上古生界中、上石炭统和下二叠统广泛分布有天然气。紧邻天然气储集层之上的泥质岩直接盖层的扩散系数介于10~(-7)～10~(-9)cm~2/s之间,而非含气层之上的粉砂质泥岩则为10~(-6)cm~2/s;泥岩多为10~(-8)cm~2/s,个别样品为10~(-9)cm~2/s。这一中等级别的封盖条件是造成该地区上古生界气藏单井产量较低的一个重要因素。
Among the Upper Paleozoic in the Shan-Gan-Ning Basin, the Upper Carboniferous and the Lower Permian are widely distributed with natural gas. The diffusion coefficient of the direct caprock of shale immediately above the gas reservoir is between 10 ~ (-7) ~ 10 ~ (-9) cm ~ 2 / s, while the non-gas-bearing silt Mudstone is 10 ~ (-6) cm ~ 2 / s; mudstone is mostly 10 ~ (-8) cm ~ 2 / s, and some samples are 10 ~ (-9) cm ~ 2 / s. This mid-level capping condition is an important factor contributing to lower single well production in the Upper Paleozoic gas pool in the area.