Development and exploration practice of the concept of hydrocarbon accumulation in rifted-basin troughs: A case study of Paleogene Kongdian Formation in Cangdong sag, Bohai Bay Basin

Xianzheng ZHAO,Lihong ZHOU,Xiugang PU,Fengming JIN,Wenya JIANG,Dunqing XIAO,Wenzhong HAN,Zhannan SHI

Fig. 2. Main structure types of troughs in the rifted basin (location of the section is shown in Fig. 1). O?Ordovician; C-P?Carboniferous-Permian; Ek1—the first member of Paleocene Kongdian Formation; Ek1s? upper submember of Ek1; Ek1x—lower submember of Ek1; Ek2—the second member of Paleocene Kongdian Formation; Ek3—the third member of Paleocene Kongdian Formation; Es?Paleocene Shahejie Formation; Ng?Neogene Guantao Formation; Mz?Mesozoic.