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Depositional Characteristics and Genesis of Lower Cretaceous Sublacustrine Fan in Wuliyast Sag,Erlian Basin

DENG Yi-Lin1,WANG Tian-qi2,CAO Zhen-lin1,PEI Ming-li1,ZHAO Wei1,YANG Gui-ru2(1.Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China;2.Huabei Oil Field Company,PetroChina,Renqiu 065520,China)  
A set of typical sedimentation of sublacustrine fans in lower Cretaceous in Wuliyasitai sag of Erlian basin is composed of feeder channel,inner fan,middle fan,and outer fan.The main micro-facies include feeder channel and main channel in inner fan,furrow dam and braided channel in middle fan,inter-channel and sheet turbidite sand in outer fan.Although a single sub-lacustrine fan is not large in scale,the sedimentation is characterized as multi-stage development,group distribution,vertical superposition,and superimposed horizontal lace.Thus,the depositional scale is large.The big open ended space and continuous supply of deposits are two key factors for forming the thick sub-lacustrine fan.Meanwhile,the place of downthrown block of growth fault or the slope-break zones is the favorable area for the sub-lacustrine fan development.The conglomerate body in sub-lacustrine fan is close to hydrocarbon-generated sag and prone to lithologic trap formation and hydrocarbon accumulation;thus it is important for oil and gas exploration.
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