Abstract: In the 1980s,petroleum explorations started in the Haian Sag of the Northern Jiangsu Basin,sporadically discovering several oil-bearing fault blocks.Due to long time span and dispersed data,there was no unified identification method for oil reserves.Based on the studies of reservoir properties,combined with the data from coring drilling,logging,well completing testing and production testing,the method for reserve identification was proposed in this paper,making the identification for oil and water formations more accurate.The method was applied in several recently discovered oil-bearing fault blocks in the Haian Sag,and was proved an effective method for logging interpretation of petroleum exploration and development.Meanwhile,it could guide oil testing works in the future.