A series of Cenozoic sedimentary basins that buried oil and gas have developed near Nansha area, in which Zengmu basin across china tractional boundary is one of the richest bearing gas-oil area.

• 南沙群岛附近海域发育有一系列富含石油和天然气的新生代沉积盆地,其中跨越我国传统海疆线的曾母盆地是油气蕴藏最丰富的地区之一。