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在深入分析泥岩盖层对各种相态天然气的封闭机理及主要影响因素的基础上，选取排替压力、异常孔隙流体压力和异常含气浓度或扩散速度分别作为盖层对游离相、水溶相和扩散相天然气封闭能力的评价参数，通过对其进行划分等级、赋予权值、再加权平均的方法，探讨了泥岩盖层对各种相态天然气封闭能力的综合评价方法，并将其应用于松辽盆地三肇凹陷3套区域性盖层的评价中，其结果与该区天然气的分布特征十分吻合，表明该方法针对泥岩盖层对各种相态天然气封闭能力的综合评价是可行的。
Based on the deep analysis of the sealing mechanism and main influencing factors of mudstone caprock on various facies natural gas, the effects of displacement pressure, abnormal pore fluid pressure and abnormal gas concentration or diffusion velocity on the formation of free-form, water-soluble phase And the evaluation parameters of natural gas sealing capacity in diffusion phase, the comprehensive evaluation method of mudstone caprock on the sealing capacity of various phases of natural gas is discussed through the method of classifying, assigning weight, and weighted average. The method is applied to In the evaluation of three sets of regional caprock in the Sanzhao Sag, Songliao Basin, the results are in good agreement with the distribution characteristics of natural gas in this area, indicating that this method is feasible for the comprehensive evaluation of mudstone caprock for the sealing ability of various facies gas.