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Hydrocarbon distribution features and main controlling factors in the Bohai Sea waters

Liu Xiaoping1,2,Zhou Xinhuai3,L Xiuxiang1,2,Zhu Xiuxiang1,2,Wang Haijun1,2(1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;2.Faculty of Natural Resources & Information Technology,China University of Petroleum,Beijing 102249,China;3.CNOOC Tianjin Company,Tianjin 300452,China)  
Among the proved reserves in Bohai Sea waters,those from structural hydrocarbon pools account for the most,taking up 66.8% of the total,while complex pools contain second largest reserves (25.9%).The number of the large/medium-sized fields only accounts for 34% of the total,while their proven reserves account for 84.4% of the total.Proven reserves are most numerous in structures of low salient,swell in sag,and salient,accounting for 45.3%,24.9% and 22.0% respectively.Vertically,about 61.0% of the proven oil reserves and 55.0% of the proven gas reserves are distributed in the Neogene.About 93.2% of the proven oil reserves and 85.0% of the proven gas reserves are distributed in the shallow to medium reservoirs with burial depth less than 3 000 m.The hydrocarbon distribution in Bohai Sea waters is the result of a series of geological processes,involving hydrocarbon source rock,depositional systems,structures,as well as fault systems.The hydrocarbons migrated in short distance and accumulated around the hydrocarbon kitchens.Factors such as favorable sedimentary facies belts,high-quality lithofacies,and favorable physical properties played important roles in the development of high-quality reserviors in Bohai Sea waters.The Tanlu fault and its induced faults controlled the formation and development of hydrocarbon kitchens,traps and carrier systems in the study area.
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