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在深入研究海拉尔盆地大下段泥岩盖层发育特征及其封气机理的基础上，对８个主要断陷大下段泥岩盖层的烃浓度封闭特征进行了研究，认为查干诺尔、乌尔逊断陷大下段泥岩盖层具有好的完全烃浓度封闭能力；贝尔、呼和湖和赫尔洪德断陷具有较好的完全烃浓度封闭能力；红旗、呼伦湖和乌固诺尔断陷仅具部分烃浓度封闭能力。大下段泥岩盖层烃浓度封闭能力形成时期早于南下段烃源岩的大量排气期，封气有效性好，有利于南下段烃源岩排出的扩散相天然气的聚集与保存
Based on the deep study of the mudstone capstones and the gas sealing mechanism in the lower section of the Hailar Basin, the characteristics of the hydrocarbon concentration of mudstone caprock in the eight major fault depressions were studied. It is concluded that the Chagannuoer, Wuerxun fault The mudstone caprock in the lower subduction zone has good sealing ability of complete hydrocarbon concentration; the complete hydrocarbon concentration sealing ability of Belle, Hohhu and Helhund faults is good; the red flag, the Hulun Lake and the Ung Noon rift are only Part of the hydrocarbon concentration of the sealing ability. The sealing time of hydrocarbon concentration in the lower reaches of the mudstone caprock is earlier than that of the source rocks in the lower part of the southern part of the Lower Paleozoic. The sealing effect is good, which is favorable for the accumulation and preservation of the diffusive natural gas discharged from the source rocks in the lower part of the southern part