南海琼东南盆地新生代构造层序研究

The analysis of Cenozoic tectonic sequence of Qiongdongnan Basin in the South China Sea

孙转 刘豪 吴哲

Sun Zhuan Liu Hao Wu Zhe

同济大学海洋地质国家重点实验室, 上海 200092; 中国地质大学(北京)海洋学院, 北京 100083

Laboratory of Marine Geology, Tongji University, Shanghai 200092; School of Ocean Science, China University of Geosciences, Beijing 100083

基于南海琼东南盆地到目前为止还没有一个统一的构造层序划分方案的问题,在前人研究工作基础上,通过大量的二维地震构造层序闭合解释,从地震不整合面和构造发育特征识别出发,对新生代主要构造层序进行详细解剖。进一步结合对南海北部琼东南盆地新生代二维地震数据的精细综合分析,重新厘定了其新生代构造层序,并进行了构造层序的识别和划分。结果表明:按古构造运动面可将盆地充填序列划分为上、中、下三个构造层序,分别对应于盆地演化的三个阶段性。着重论述了三个构造层序的结构特征、叠加构造样式、构造层序发育特征、层序分布特征、沉积体系类型和盆地断裂演化序列之间的关系等,以期为今后的研究奠定基础。

There was no unified sequence division to Qiongdongnan Basin until recently.Based on previous research and a mass of 2D seismic reflection stratigraphic interpretations, Cenozoic structural sequence was analyzed specifically from seismic reflection unconformable planes and structural development characteristics.Moreover, based on comprehensive analysis of Cenozoic 2D seismic data in Qiongdongnan Basin, Cenozoic structural sequences was studied, recognized and re-divided.The results show ed that according to the ancient tectonic moving surface, the basin-filling sequence can be divided into three tectonic sequences:upper tectonic sequence, middle tectonic sequence and lower tectonic sequence, in correspondence with the three stag es of basin evolution.The paper also focused on three structural features of tectonic sequence, superimposed structural style, structural features of sequence development, sequence distribution, and the relationship between sedimentary system types and the development of fault system and so on in order to lay the foundation for future research.

依托国家重点基础研究发展计划(973计划)课题《南海新生代大陆边缘盆地演化及油气资源潜力》(编号:2007CB411705)

https://doi.org/10.3969/j.issn.1008-2336.2011.01.008