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南海南部海域主要沉积盆地沿南沙块体南部、西部两条不同的边界分布,其成盆时代、盆地类型、盆地演化历史以及油气资源效应都有较大的差异,它们的发生发展均与南海的两次海底扩张有关；构造演化具有明显的阶段性,早期均与区域拉张作用有关,都经历了中中新世末期的变形、改造和随后的区域沉降过程,并受到礼乐运动、西卫运动和南沙运动的影响。万安、曾母和北康盆地是南海南部海域具有代表性的新生代沉积盆地,分属于不同的盆地类型。万安盆地是叠置在较薄地壳和高热流值背景之上的一个新生代走滑拉张盆地,经历了三个构造演化阶段。曾母盆地是南沙块体向南俯冲与婆罗洲块体发生软碰撞而形成的一个周缘前陆盆地,经历了四个不同的构造演化阶段。北康盆地是在南沙块体上于白垩纪末—第三纪早期由于地壳拉伸、裂陷而形成的一个陆缘张裂盆地,经历了三个构造演化阶段。
The main sedimentary basins in the southern South China Sea have two different boundary distributions along the southern and western parts of the Nansha block. The basin age, basin type, basin evolution history and oil and gas resources have great differences in their occurrence and development, The two submarine expansion related to the tectonic evolution of a clear stage, early and regional tension are related to the end of the Mid-Miocene deformation, transformation and subsequent regional settlement process, and by the ritual music movement, Western Movement and Nansha movement. Wan’an, Zengmu and Beikang basins are representative Cenozoic sedimentary basins in the southern South China Sea, belonging to different basin types. The Wan’an Basin is a Cenozoic slip-stretching basin superimposed over a thin crust and a high heat flow background, undergoing three stages of tectonic evolution. The Zengmu Basin is a peripheral foreland basin formed by the south collision of Nansha block with the soft collision of Borneo block and has experienced four different tectonic evolution stages. The Beikang basin is a continental rift basin formed in the Nansha block at the end of the Cretaceous-Early Tertiary due to crustal stretching and rifting. It has undergone three tectonic evolution stages.