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大庆长垣及西部地区嫩江组一、二段泥岩盖层宏观上具有厚度大、面积大、分布广泛的特点，微观上则表现为微孔为主、渗透率低、比表面积大、排替压力高，形成欠压实孔隙流体超压和烃浓度封闭等特征。毛细管封闭约形成于嫩江组三段中期，深度约为６５ｍ，压力及烃浓度封闭约形成于明水组晚期，深度约为８００ｍ。齐家古龙凹陷为Ⅰ级封闭区，具有较强的毛细管封闭能力，齐齐哈尔西北部为Ⅲ级封闭区，其余为Ⅱ级封闭区。
The Daqing Changyuan and the Nenjiang Formation mudstone cap rocks in the western part of Nenjiang Formation have macroscopic features of large thickness, large area and wide distribution. The microscopic pores are mainly micropores, with low permeability, large specific surface area and displacement pressure High, forming undercompact pore fluid overpressure and hydrocarbon concentration closed features. Capillary closed about formed in the middle of Nenjiang Group 3, with a depth of about 65m. The closed pressure and hydrocarbon concentration was formed in the late Mingshui Formation with a depth of about 800m. Qijia Gulong depression is a Class I closed area with strong capillary sealing ability. The northwest of Qiqihar is Grade III closed area, while the rest is Class II closed area.