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Application of sequence stratigraphy to subtle oil and gas reservoir exploration in southeast slope of Qinnan depression of Bohai Bay,China

WANG Yuan-jun;TENG Yu-bo;SHI Wen-long;GUO Tao;WANG Jun;JIANG Ben-hou;State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology;Institute of Petroleum Exploration and Development of CNOOC Bohai Oilfield Company;  
This paper discusses the distribution laws and prediction methods of the subtle oil and gas reservoir in a sequence framework.Guided by the sequence stratigraphic theories,this paper studies the sequence stratigraphy features of Paleogene Dongying Formation in the southeast slope of the Qinnan depression in Bohai Bay in detail by using well drilling,logging and seismic data.Dongying Formation is divided into 3third-order sequences,that is Sequence Dong 3,Sequence Dong 2andSequence Dong 1.The depositional model of Sequence Dong 3is constructed and the petroleum accumulation model of the subtle oil and gas reservoir is concluded.The research results show that in the late period of Sequence Dong 3reservoir well developed and widely distributed with water level falling and the abundant material supplying,which can form a large-scale formation reservoir combined with the stable distribution of mudstone in Sequence Dong 2.In the early stage,the water gradually rises and an overlap pinch-out lithologic reservoir can be formed.Below the thick mudstone of Sequence Dong 2,the main controlling factors of the petroleum accumulation for the subtle oil and gas reservoir are the sand distribution characteristics controlled by the change of lake level.The exploration potential is great in subtle reservoirs of the Qinnan depression.
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