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渤海中生界全为海水覆盖,地层研究受到条件种种限制,此前研究程度低,只划分到系、统,未建立组、段。现将渤海中生界划分为10个组,其中钻遇了7个,依次为侏罗系的海房沟组、蓝旗组,白垩系的义县组、九佛堂组、沙海组、阜新组、孙家湾组。对各个组岩性、生物组合、电性和地震反射特征与辽西露头剖面进行了对比,两地岩性及古生物组合具有较好的对应关系。各个组的厚度及分布范围差别大,与断裂有一定的关联性。
The Bohai Sea Mesozoic are all covered by seawater, and stratigraphy is limited by the conditions. Previously, the research was only limited to systems, systems and groups and sections were not established. Now the Bohai Sea Mesozoic is divided into 10 groups, of which seven were encountered, followed by the Jurassic Haifanggou Formation, the Blue Flag, the Cretaceous Yixian Formation, Jiufotang Formation, Shahai Formation, Fuxin group, Sun Bay group. The characteristics of lithology, biotic assemblage, electrical property and seismic reflection of each group are compared with the profile of Liaoxi outcrop. The lithology and paleontological assemblage of the two groups have a good correspondence. The thickness and distribution range of each group vary greatly, and fracture has a certain relevance.