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为了准确评价盖层毛细管封闭能力 ,综合考虑盖层本身封闭性和宏观发育特征及天然气本身性质对封闭能力的影响 ,给出了假定外力作用下天然气通过泥岩盖层渗滤速度的计算公式及参数确定方法 ,并根据泥岩盖层渗滤速度的大小 ,提出了泥岩盖层封气能力等级划分标准 .采用该方法综合评价了大庆长垣以东地区泉一、二段泥岩盖层封气能力 ,结果表明 :泉一、二段泥岩盖层在安达 -肇洲背斜带具有好的封气能力 ,由此向东北和东南封气能力由好变差
In order to accurately evaluate the Capillary Capability of caprock, considering the effect of confining and macroscopic development of cap rock itself and the properties of natural gas on captivity, the formula and parameter of gas percolation velocity through mudstone cap under the assumption of external force According to the percolation rate of mudstone caprock, the grade of gas sealing capability of mudstone caprock is put forward, and the gas sealing capacity of mudstone caprock in the first and second sections of the east of Daqing Changyuan, The results show that the first and second mudstone cap rocks have good gas sealing capability in the Anda-Zhaozhou anticline, and thus the gas sealing capacity in the northeast and southeast from good to poor