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选取差储层排替压力差、异常孔隙流体压力、异常含气浓度和断层封闭性、泥质岩单层厚度、沉积环境分别作为泥质岩盖展微观封闭能力和宏观展布的评价指标．通过对其进行等级划分，赋存权值，并根据其在泥质岩盖层中的发育特征及其对封盖性能的影响程度对其进行权重分配，再利用加权平均法计算泥质岩盖层封盖性能综合评价仅值大小．探讨了泥质岩盖层封盖性能的综合评价方法，并将其应用于大庆长恒及其以西地区嫩二段泥岩盖层封盖性能的综合评价中，其结果与该区实际地质条件十分吻合，证实了该方法的可行性。
The differential pressure of differential reservoir replacement, abnormal pore fluid pressure, abnormal gas concentration and fault seal, the thickness of single monolayer of sedimentary rocks and the sedimentary environment are selected as the assessment indexes of micro-seal capacity and macroscopic distribution of shale cover. According to its grading, the weight is assigned, and according to its developmental characteristics in shale caprock and its influence on the capping performance, the weight distribution is carried out, and then the weighted average method is used to calculate the shale cap Layer capping performance comprehensive evaluation only the size. This paper discusses the comprehensive evaluation method of muddy cap capping property and applies it to the comprehensive evaluation of cap capping performance of mudstone caprock of Changqing and its adjacent area in the west of Daqing. The result is in good agreement with the actual geologic conditions in this area Anastomosis, confirmed the feasibility of the method.