Sunwu-jiayin Basin Lower Cretaceous Petroleum Geological Characteristic And Favorable Area Prediction

In the preceding process of exploration,Sunwu-Jiayin basin never found the indication of oil and gas.In the Xunke-zhanhe sag Taoqihe formation,Jia 1 well drilled recently found above the average is hydrocarbon source rock,it shows that Sunwu-Jiayin basin possess good exploration prospect.This article trying to base on the nearest drilling consequence and reinterpreted seismic data,further researches the petroleum geological characteristic of this basin,predicts the favorable zone,offers scientific evidences of the next oil and gas exploration and development.and gets following result.Sunwu-Jiayin basin developed source-reservoir-cap combination well,possesses abundant oil and gas resource and the formation condition of oil and gas reservoir;in Sunwu-Jiayin basin the formation time of traps and the hydrocarbon expulsion match well,it's favorable for the formation of oil and gas reservoir.The most favorable zone of oil and gas accumulation is Xunke-zhanhe sag in Zhanhe depression,which in the middle of Sunwu-Jiayin basin has the biggest area of among all sags in the basin.The condition of source-reservoir-cap combination in Xunke-zhanhe sag is best,The structure is confirmed,there are fault anticline structure in the sag,it have been found some stratigraphic traps limited by strata pinch-out line and some structural traps and in the west side of the sag,it has the possibility of forming structural reservoir.ZH No1 fault No1 fault anticline is the relatively favorable structural belt.Yaotun sag in Sunwu depression which in the northwest of Sunwu-Jiayin basin has a relatively low degree of exploration indicating a huge potential.The source-reservoir-cap assemblage in the sag is mainly shelf source-reservoir-cap.Matches well.The hydrocarbon source of Taoqihe formation developes well.The indexes of hydrocarbon source are better in the depth of fault depression.the lake facies and delta facies in Taoqihe formation develop well and it can supplys good reservior and cap.reservior is low porosity and medium low permeability,the migration scope is limited.north side syncline SJ09-192.5 survey line CDP:2700 site has fault structure nearby,it has a relatively high possibility to form a trap,and it's near the center of hydrocarbon source so that it has the possibility of forming a structure reservoir.