综合利用钻井、岩心、薄片及分析化验资料研究了琼东南盆地深水区新近系海底扇沉积特征，并利用最新的三维地震资料，通过井震精细标定、多属性融合技术、方差体切片、三维地貌砂体镂空等综合技术手段，精细刻画了海底扇砂体的空间分布特征。研究结果表明，深水区新近系海底扇是由陆架区的砂体滑塌并二次搬运形成，形成过程具有多期次性。受不同物源的影响，海底扇岩性和物性存在较大的差异。海底扇岩性及沉积构造具有砂质滑塌、碎屑流、浊流和深水底流改造的特征。海底扇的沉积微相、厚度、砂泥比和砂泥岩空间配置关系直接控制了地震振幅反射强度和频率的变化。砂体纵向叠置，横向连片，并被后期泥质水道切割分块形成多个岩性圈闭。综合分析认为，深水区海底扇砂体发育区烃源条件优越，储盖配置关系和圈闭条件良好，具备形成大中型岩性油气藏的有利条件，具有较大的油气勘探潜力。%The sedimentary characteristics of Neogene submarine fan in deep-water area of Qiongdongnan Basin was studied through integrated utilization of drilling,well core,slice and laboratory test data.The results show that these submarine fans were formed by transportation of sandy slumps,which featured multi-period.The lithology and physical properties of the submarine fans vary significantly under the control of different sediment sources.The sedimentary structures show characteristics of sandy slump,debris flow,turbidity currentand deep-water under-flow alternations.Seismic reflecting amplitudeand frequency reflect changes of sedimentary microfacies,sandstone thickness,sand-shale ratio and sand-shale spatial distributions.Using new 3D seismic data collected in deep-water area,the spatial distribution of submarine fans are depicted by techniques of fine well-seismic calibration,multi at-tribute,slice and 3D sand hollow.It was found that these submarine fans,stacked vertically and laterally,were cut by muddy channels latterly to form several lithological traps.In conclusion,the submarine fans is with huge exploration potential forming large scalelithological gas reservoirs based on its fine hydrocarbon source rock,good reservoir-cap combination and traps.
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