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Palaeogeomorphologic control on sedimentary process of submarine fans and hydrocarbon accumulation:a case study of Member 1 of Huangliu Formation in DF area,Yinggehai basin

Liu Feng;Pei Jianxiang;Wang Yang;Gao Hua;Pan Guangchao;Li Yangsen;Zhanjiang Branch of CNOOC Ltd.;  
In allusion to complex sand body distributions and uncertain provenance directions of submarine fans of middle-deep layers in DF area,Yinggehai basin,palaeogeomorphologic restoration,provenance and slope break belts in Member 1 of Huangliu Formation(Nh1),Upper Miocene in DF area were researched with techniques of high-precision sequence stratigraphy analysis and borehole-seismic strata thickness restoration,and palaeogeomorphologic control on sedimentary process and its relationship with hydrocarbon accumulation were also discussed.It is concluded that the macro-regional ancient tectonic setting is the main factor in triggering large submarine fans in Nh1 in DF area,western Yinggehai basin,and the micro-palaeogeomorphologic units and their combination patterns obviously controlling sedimentary evolutions,migration directions and internalstructures of large submarine fans.Palaeo-slope break belts control the development degree of submarine fans.Palaeo-ditchs control sedimentary input locations and directions.Palaeo-lows control sedimentary locations,migration directions and internal structure,and macro-palaeogeomorphologic patterns positively affect distributions of regional hydrocarbon source rocks and mudstone caprocks,and hydrocarbon reservoirs formation and distribution.Exploration practices show that comprehensive techniques of high-precision palaeogeomorphology and seismic sedimentology can improve macroscopic cognition of submarine fan sedimentary process and reservoir prediction accuracy,provide guidelines for construction of accumulation pattern of independent lobe sandstone traps,and achieve satisfactory exploration.
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