莺歌海盆地海口29区下中新统三亚组一段洲—扇源—汇系统及沉积模式OA

According to the data of drilling,core,3D seismic,well logging and laboratory analysis,the main factors of sedimentary type and delta-fan source-sink system of the first member of Sanya Forma-tion in Lower Miocene in Haikou 29 Area,Yinggehai Basin are analyzed.The sand transport channel of submarine fan in the front of delta is described semi-quantitatively,and the delta-fan source-sink system and sedimentary model of the first member of Sanya Formation in the Lower Miocene are defined.The results show that the lithology of the first member of Sanya Formation is dominated by fine sandstone and mudstone interbeds.The sandstone develops gravity flow structures such as Bouma sequence,de-formation structure,block structure and scour surface.The C-M diagram determines that it belongs to submarine fan deposition.The flexural slope break is developed at the front of the delta,and accompa-nied by north and east sand transport channels.The scale and distribution of the submarine fans is gov-erned by the dimensions and orientation of these sand transport channels.Based on this,a continental fan-sink system of"continent-channel-slope-fan"in the Sanya Formation section of Haikou 29 Area is established by comprehensive of the source delta,sand transport channel and the control of sedimenta-tion by slope bend zone.These results provide guidance for deep sand bodies prediction and planning ex-ploration in the Yinggehai Basin.