【摘要】 新近纪时期,莺歌海盆地受到顺时针方向海岸流的影响,来自红河水系的细粒沉积物被搬运至莺东斜坡并成条带状分布,莺东斜坡浅海陆架沉积的扇体和水道向东南方向偏转。岩心和地震资料表明:位于南海北部陆缘的莺歌海和琼东南盆地在新近系时期内波发育,导致向陆坡方向传播的沉积物波的产生,并在陆架斜坡下形成平行于斜坡方向脊槽相间的沉积地貌,由于相对较小的地形起伏也可影响浊流的沉积,因此地貌特征直接导致了轴向水道的形成,虽然单一轴向水道规模不大,但是由于其受到底流的改造作用较强,因此渗透率往往较高,且低位期该水道往往砂质物源充沛,水道晚期漫溢连片,勘探前景乐观。更多还原

【Abstract】 As oil and gas exploration moves toward some deepwater belts, to study ocean-current features is becoming more and more important to analyze source, sum up sandbody distribution, and search for high-quality reservoirs. Yinggehai Basin was affected by coastal current in a clockwise direction during the Noegene. So, fine-grained sediments originated from the Honghe water system migrated to the Yingdong slope and had a banding distribution; both fan bodies and channels deposited at shallow-marine shelf of the slope turned to the southeast. Some core and seismic data may illustrate that for the Yinggehai and Qiongdongnan basins located at continental margin, northern South China Sea, their internal waves were developed during the Neogene, resulted in generating sediment wave which released to the continental slope. At last, a low-and-ball sedimentary geomorphology formed which was parallel to the slope. Geomorphologic features led to forming axial channels since relatively smaller topographic relief might impact on turbidity-current sediments. Although many single-axial channels were small in scale, they were strongly affected by reconstruction of under current, causing higher permeability, abundant sandy source during LST, and continuous distribution at the later stage. So, these bring about a better exploration prospect.更多还原