Petroleum exploration breakthrough and geological significance in Cretaceous Yingcheng and Denglouku formations of Shuangcheng area, northern Songliao Basin, NE China

查看全文 作　　者：LIU [1,2]Chao;FU [1,2]Xiaofei;LI [3]Yangcheng;WANG [1,2]Haixue;SUN [3]Lidong;LU [3]Jiamin;LI [3]Junhui;SUN [3]Youhai;SHI [3]Lidong;HU [1,2]Huiting;YUAN [1,2]Hongqi;YANG [1,2]Zicheng 机构地区：[1]Northeast Petroleum University,Daqing 163318,China;[2]Ministry of Education Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development,Northeast Petroleum University,Daqing 163318,China;[3]PetroChina Daqing Oilfield Company Ltd.,Daqing 163712,China 出　　处：《Petroleum Exploration and Development》索引2023年第50卷第1期,共13页 基　　金：Supported by the National Natural Science Foundation of China(U20A201009,41972157). 摘　　要：Based on drilling geological,geochemical,geophysical and production test data,the characteristics of source rocks,reservoir rocks and caprocks,as well as the process of hydrocarbon generation,trap evolution and oil accumulation of the oil-bearing assemblage composed of the Cretaceous Yingcheng Formation(K1yc)and Denglouku Formation(K1d)in the Shuangcheng area,northern Songliao Basin,NE China,were analyzed by using the research methods for petroleum systems.The source rocks mainly exist in K1yc,with the organic matters mainly originated from lower aquatic organisms and algae,and reaching the grade of high-quality source rock in terms of organic abundance.The crude oil,which is characterized by low density,high freezing point and high wax content,is believed to have generated by the K1yc source rocks.The reservoir rocks include K1d sandstones and K1yc glutenites.The mudstone in the fourth member of K1d serves as the direct caprock of the oil reservoir.The oil was generated during the period between Yaojia Formation and Nenjiang Formation,and then accumulated during the periods of Nenjiang Formation and Paleogene–Neogene.The traps evolved in three stages:the late Yingcheng Formation,the late Quantou Formation and the late Nenjiang Formation,forming structural and structural-lithologic reservoirs.It is concluded that good source-reservoir-caprock assemblage,late hydrocarbon charging,short migration distance and stable tectonic setting are favorable factors for the formation of oil reservoirs. 关 键 词：petroleum system Cretaceous Yingcheng Formation Cretaceous Denglouku Formation source rock reservoir oil accumulation Shuangcheng area Songliao Basin