Tectonic development characteristics and favorable exploration direction of Q innan sag in Bohai Bay Basin
Cai Shaowu1, Zhou Donghong1, Wang Deying1, Zhang Jingsi1, Zhang Zhen1, Li Ying2
1. Bohai Oilfield Research Institute, Tianjin Branch, CNOOC China Limited, Tianjin 300459, China;
2. CNOOC EnerTech-Drilling & Production Company, Tianjin 300452, China
The Qinnan sag of Bohai Bay Basin is located in the strongly transtensional tectonic zones at the intersection of the NE-trending Tanlu fault zone and the NW-trending Zhangjiakou-Penglai strike-slip fault zone, of which the fault system has two dynamical mechanisms, i.e., extension and strike-slip. Through finely describing the structure and tectonic characteristics of each subsag in Qinnan sag, a statistical comparison is made on the activity of the main subsag-controlling faults in each period of the Cenozoic; the formation and evolution of Qinnan sag is restored by using balanced section technology. The research indicates that the fault development in Qinnan sag shows spatiotemporal difference, and the strength of fault activity presents the characteristics of "strong in the east and the south but weak in the west and the north" on a regional scale. The activity generally shows the migration from west to east and from north to south. Qinnan sag has a tectonic pattern of "zonation in north-south direction and segmentation in east-west direction". The west subsag and the southeast subsag are dominated by extensional structures, while the east subsag is dominated by strike-slip and extensional structure. The Late Mesozoic-Cenozoic tectonic evolution of Qinnan sag can be divided into seven stages. Through analyzing the dual dynamic mechanism of extension and strike-slip in Qinnan sag as well as the difference in the tectonic development characteristics of each subsag, the impacts from the tectonic characteristics of Qinnan sag on hydrocarbon occurrence and accumulation are revealed to provide the basis and guidance for determining favorable hydrocarbon exploration direction in the east subsag of Qinnan sag.
蔡少武, 周东红, 王德英, 张京思, 张震, 李颖. 渤海湾盆地秦南凹陷构造发育特征与有利勘探方向[J]. 石油学报, 2019, 40(5): 532-541.
Cai Shaowu, Zhou Donghong, Wang Deying, Zhang Jingsi, Zhang Zhen, Li Ying. Tectonic development characteristics and favorable exploration direction of Q innan sag in Bohai Bay Basin[J]. Acta Petrolei Sinica, 2019, 40(5): 532-541.
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