南海北部深水区中新世生物礁发育特征
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摘要
基于近些年南海北部深水区采集的地震资料,对南海北部深水区中新世生物礁发育特点进行分析、对比和研究,认为西沙隆起地区发育典型的生物礁,具有丘状反射、强振幅、中频、中连和杂乱地震相,发现琼东南盆地北礁地区在中新世梅山组也有似礁相发育。通过对琼东南盆地深水区中新世生物礁层序地层学分析,认为生物礁在中新世梅山组海侵体系域和高位体系域发育。从对北礁地区典型生物礁剖面进行的波阻抗反演来看,其与LH11-1生物礁油田的波阻非常相似,波阻抗值为8×106—9×106kg/(m2·s)。古地理分析认为,中新世西沙隆起区与北礁地区处于滨、浅海沉积环境,梅山组时期的陆缘碎屑供给量比较少,适于生物礁发育。
Based on the seismic data obtained in deepwater area of northern South China Sea in recent years,the development of ancient Miocene reef was analyzed.The seismographic result shows typical reef feature in the Xisha uplift,such as the mound,high amplitude,middle frequency,middle continuity,and chaotic reflection.Some reef-like reflection was found in the Miocene Meishan Formation in Beijiao(northern reef) area of Qiongdongnan(southeastern of Hainan) Basin.Further sequence analysis shows that the reef reflection was developed mainly in the highstand systems tract and transgressive systems tract.The wave impedance from inversion calculation is very similar to that of LH11-1 Reef Oilfield,ranging 8×106—9×106kg/(m2·s).Paleogeographic analysis shows that the areas of Xisha uplift and Beijiao were located in tropical offshore and neritic environment,and had very few terrigenous supply in the Miocene Meishan period,which favored the development of reef.
引文
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