大庆嫩二段泥岩盖层封气性综合定量评价

QUANTITATIVE EVALUATION ON COMPREHENSIVE SEALING ABILITY OF MUDSTONE CAPROCK OF SECOND MEMBER OF NENJIANG FORMATION FOR GAS IN DAQING

在详细分析大庆嫩二段泥岩盖层地质发育特征的基础上，用盖层封油气性综合定量评价指标CRI对其封气性进行了综合定量评价。在齐家古龙凹陷和大庆长垣地区嫩二段泥岩盖层具好的封气性，齐齐哈尔西北的局部地区具差的封气性，其余地区具中等封气性。这对该萨尔图油层中天然气的聚集成藏起到了重要作用。

Based on the analysis of geological development characteristics of mudstone caprock of second member of Nenjiang formation in Daqing, this paper comprehensively evaluates the sealing ability of it for gas by the caprock index CRI for gas, considered that mudstone caprock of second member of Nenjiang formation in Qijia-Gulong depression and Daqing placanticline has good sealing a-bility, bad sealing ability in northwest parts areas in Qiqihaer, medium sealing ability in other areas. Therefore, it plays a more important role in gas accumulation and forming gas pools in Saertu oil layer.