DEEPWATER SEDIMENT TRANSPORTATION MODELS FOR NORTHERN SOUTH CHINA SEA SLOPES

There are 7 types of transportation in the northern South China Sea, including debris flow, turbidity flow, sandy debris flow, carbonate gravity flow, mass transport, river-influx,and deepwater channels, All of them play imporfant role in the formation of sediment types and distribution of reervoirs. Sandy debris flow deposits, mass transport complex and deepwater channel sands are the main types of reservoirs, and the turbidite sand are less common in the study area. The deepwater reservoir in the Pearl River Mouth Basin was influenced by river supply reworked by bottom current, and carbonate gravity flow existed, which proved the strong hydraulic condition in this basin; the deepwater reservoir distribution in Qiongdongnan Basin was controlled by debris flow and influenced by deepwater channels,there may exist good sorted clean sand body in the deepwater area of Qiongdongnan Basin compared to the shallow water area, which could have good exploration prospective.