南海北部陆坡深水区沉积物输送模式探讨

南海北部陆坡深水区沉积物输送模式复杂多样,研究发现主要有碎屑流、浊流、砂质碎屑流、碳酸盐岩重力流、块体搬运、河流搬运、深水水道搬运7种类型,它们共同影响着南海北部陆坡沉积物类型和储层分布。其中(砂质)碎屑流沉积、块体搬运沉积、河流供给、深水水道砂是南海北部深水储层的主要成因,而纯粹的浊积岩在该地区发育不广泛。珠江口盆地的深水储层受到河流的供给和后期流体改造的影响,并且存在碳酸盐岩重力流沉积物薄层,证明该地区水动力条件较强;琼东南盆地深水储层分布受到了碎屑流控制和深水水道的影响,相对浅水区来看可能存在分选较好、干净的砂体储层,具有良好的勘探潜力。

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.