南沙中部海域诸盆地地震地层分析

Seismic stratigraphic analysis of basins Nanweixi and Nanweidong in middle Nansha, South China Sea

利用在南沙中部海域所采集的大量地震反射资料及围区地质、钻井资料 ,对南薇西、南薇东和永暑盆地的地震反射剖面进行了地震界面及地震层序划分 ,对其反射特征进行了较详细的描述 ,并对各地震层序的地质时代进行了探讨。在进行地震相划分和沉积相分析的基础上 ,对各层序的沉积特征和沉积发育史进行了分析 ,这为研究该区沉积盆地的油气生储盖特征提供了基础资料。

A detailed analysis of the seismic interfaces and seismic sequences was performed on the seismic data acquired from basins of Nanweixi, Nanweidong and Yongshu in the sea area of middle Nansha, South China Sea. The results were verified by geologic, drilling, and seismic data collected from neighboring areas. The reflection characters of seismic sequences were characterized, and the geologic age of each seismic sequence was also inferred. Based on the classification of the seismic facies and analysis of sedimentary facies, we analyzed the sedimentary characteristics and sedimentary history of each seismic sequence. The results are of great importance to the study of source-reservoir-cap rock association in the area.