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Controlling effect of a strike-slip transform belt on hydrocarbon accumulations in the Huanghekou Sag,the Bohai Sea waters

Zhu Xiuxiang1,2,L Xiuxiang1,2,Wang Deying3,Zhang Jie1,2(1.Basin & Reservoir Research Center,China University of Petroleum,Beijing 102249,China; 2.Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Petroleum,Beijing 102249,China;3.CNOOC Tianjin Company,Tianjin 300452,China)  
The Huanghekou sag,located in the southeast of Bohai Sea waters,is cut through at the center by the west branch of the Tanlu fault zone,forming a strike-slip transform belt in the central uplift.This belt,according to recent exploration results,is considered as one of the key hydrocarbon-bearing structural zones in the sag.Studies on the structures and their evolutionary characteristics in the belt,in addition to the analysis of the hydrocarbon accumulation patterns inside the belt,indicate that the transformation belt controls hydrocarbon accumulation in the central uplift through controlling the development of traps,the distribution of sandbodies,and the formation of carrier systems.The controlling effect of the transform belt is therefore regarded as a useful clue for finding hydrocarbon-bearing areas and for improving exploration efficiency.
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