Gravity-flow deposits in the Members 1 and 2 of Paleogene Shahejie Formation and their significance for oil-gas exploration in Liaodong Bay Depression,Bohai Bay Basin
1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059 Sichuan; 3 Tianjin Branch of CNOOC,Tianjin 300452
Abstract：Various gravity-flow deposits have been identified, using cores of the Liaodong Bay Depression in the early stage of faulted-depression phase, which consists of the Members 1 and 2 of Shahejie Formation. Gravity-flow deposits as documented in this study can be divided into turbidities,sandy debrites and slumps and slides based on sedimentary characteristics of cores,logging information and sediment gravity flow theory. These gravity-flow deposits in this period were developed in delta fronts in the Members 1 and 2 of Shahejie Formation which were triggered by paleoearthquakes and gravity. The sediment supply represents the most important controlling factor. With reference to previous studies,and superimposion,distributing locations and connecting-well sections of different gravity-flow deposits,this study establishes the depositional model of gravity flow in delta fronts at the early stage of faulted-depression phase,which can be divided into three facies belts: Slump-root belt,middle-slope belt,and basin plain belt. Based on the analysis of reservoir properties of different gravity-flow deposits,sandy debrites flow and near-source turbidities distributed in middle zone of slope,represtent favorable reservoir for hydrocarbon exploration. The scale of gravity-flow sandbodies in delta front of the Member 2 of Shahejie Formatiom is shown to be larger than that of Member 1. These sandbodies have a good condition of source,reservoir,cap and migration of hydrocarbon accumulation,which has the significance for oil and gas exploration.
Liu Lei,Chen Hongde,Zhong Yijiang et al. Gravity-flow deposits in the Members 1 and 2 of Paleogene Shahejie Formation and their significance for oil-gas exploration in Liaodong Bay Depression,Bohai Bay Basin[J]. JOPC, 2017, 19(5): 807-818.
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