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在全面分析海拉尔盆地大磨拐河组下段泥岩盖层发育特征及微观封闭特征的基础上，选取排替压力、异常孔隙流体压力、天然气体积分数、盖层厚度和沉积环境作为评价参数，通过对其划分等级，赋予权值，再利用加权平均值对海拉尔盆地８个主要断陷大磨拐河组下段泥岩盖层封盖油气能力进行了综合评价．结果表明：海拉尔盆地各断陷大磨拐河组下段泥岩盖层均具有较强的油气封盖能力，是该盆地南屯组上段油气聚集成藏的重要条件
On the basis of comprehensively analyzing the development characteristics and microscopic seal characteristics of mudstone caprock in the lower part of Damoguaihe Formation in Hailaer Basin, the displacement pressure, abnormal pore fluid pressure, gas volume fraction, caprock thickness and sedimentary environment were selected as evaluation parameters. Then the weighted average values were used to make a comprehensive evaluation of the caprock capstone oil and gas capablities in the lower reaches of the Damoguaihe Formation in the eight main fault depressions in the Hailar Basin. The results show that the mudstone caprock in the lower part of Damoguaihe Formation in each fault depression of the Hailar Basin has strong captivity of oil and gas and is an important condition for hydrocarbon accumulation in the upper reaches of Nantun Formation in this basin