Abstract: The oil and gas assemblage in the third member of the Funing Formation(Ef³),the North Jiangsu Basin is a main target stratum of progressive increasing in proven oil reserves and output recently.The good-quality brackish-water-facies source rocks formed in the middle-lower part of the Fu-2 Member (Ef²) of the basin is the principal source rocks of Ef₃ oil pools.The favorable reservoirs lie in the upper parts of upper and lower Ef³ sandstone,and thick layers of lake-facies mudstone with poor hydrocarbon-generating ability lie between the reservoirs and the middle-lower part of Ef³ source rocks.Therefore,the association of source rocks,reservoirs and caprocks becomes worse,and need to be linked up by faults so as to form good oil pools.Oil pools of Ef³ appear in definite locations.They are mainly formed nearby inherited nose uprift belts and contemporaneous faults or large late-stage faults.Favorable structural types and organic matching of sedimentary systems,tectonic frameworks and trap bodies are necessary elements to form the oil and gas pools of Ef³.The pool-forming model of oil and gas in Ef³ showed that the main objects of oil and gas exploration should be focused on inherited uplift belts and contemporaneous faults or large late-stage faults in the districts with unfavorable source rock-reservoir-caprock matching.