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Formation and evolution of Laizhou Bay Sag in Bohai Bay

PENG Wenxu1 XIN Renchen2 SUN Hefeng1,3 WU Kui1 SHI Hao1 WANG Deying1(1.Exploration and Development Research Institute,CNOOC Bohai Oilfield Company,Tianjin 300452,China;2.College of Ocean Science,China University of Geosciences,Beijing 100083,China;3.School of Resources and Information Technology,China University of Petroleum,Beijing 102249,China)  
The drilling data and 3D seismic profiles were used to study the formation and evolution of Laizhou Bay Sag in the southern area of Bohai Bay.The results demonstrated that the Laizhou Bay Sag formed on the basis of the Cenozoic rift.During the deposition period from Kongdian Formation to the third segment of Shahejie Formation,the Tanlu strike-slip faults had a small influence on the sag,and the influence mainly came from the extended faults.The deposition center was located at the boundary downthrown side of shovel-type big fault.During the deposition period from the first segment of Shahejie Formation to Dongying Formation,the deposition center migrated to the east-north direction along the Tanlu fault.During the deposition period of the Guantao and Minghuazhen formations in the Neogene,this area under the action of strike-slip compression showed the extrusion reverse and produced the salt arch and the reverse structure.The strike-slip fault slightly influenced distribution of hydrocarbon source rock in Shahejie Formation,but it had the tremendous influence on the distribution and the deposition of source rocks in Dongying Formation and also had the tremendous influence on the latest oil-gas accumulation.
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