南沙海域主要沉积盆地局部构造特征及组合样式研究

Study of local structural features and configuration in major sedimentary basins in the south part of South China Sea

广州海洋地质调查局,广东广州510760

Guangzhou Marine Geology Bureau, MLNR, Guangzhou 510760, China

局部构造是盆地油气聚集的场所, 研究其形态和成因以及空间展布特点, 有利于认识盆地的油气富集规律和油气藏特点对提高钻探成功率有重要的实用意义。总结了曾母盆地、北康盆地和南薇西盆地局部构造的基本规律, 研究了局部构造的组合样式以及配套形成的油气圈闭类型, 认为南沙海域具有形成有利局部构造的区域构造环境。主要沉积盆地中形成的局部构造与断层的控制因素密切相关; 各沉积盆地局部构造的组合形式和圈闭类型, 取决于构造发育部位以及所受区域构造运动的改造程度。

Local structures are the places where hydrocarbon concentrates in basins. The study of geometry, genesis, and spatial distribution of the local structures helps to understand the regularity of hydrocarbon concentration and characteristics of hydrocarbon reservoirs, which are valuable information for the success of drilling. This paper summarizes the basic regularities of local structures in Zengmu Basin, Beikang Basin, and Nanweixi Basin, and studies the configurations of local structures and the types of hydrocarbon traps. The author believes that the south part of South China Sea has a regional tectonic setting that is favorable for the growth of local structures. The local structures in different sedimentary basins are closely related to fault controls. The configuration of local structures and trap types are controlled from the positions of the local structures and the degree of reformation from regional tectonic movement.