珠江口盆地是我国南海北部大陆架上的一个新生代大型含油气盆地。盆地北临万山隆起区,南界在北纬18°40′附近,西与海南隆起为邻,东与台湾浅滩盆地相接,面积约15万平方公里(图1)。盆地内新生代地层发育,厚达6000余米。主要构造方向为北东东,次为不明显的北西向,有比较开阔的三大坳陷,即珠一、珠二、珠三坳陷(图1、2)。这三大坳陷是盆 The Pearl River Mouth Basin is a Cenozoic large-scale petroliferous basin on the continental shelf in the northern South China Sea. The basin is surrounded by the Wanshan uplift in the north and the southern boundary at 18 ° 40’N. The west is adjacent to the Hainan Uplift and the east to the Taiwan Shallow Basin. It covers an area of ​​about 150,000 km 2 (Figure 1). Cenozoic strata within the basin development, thickness of 6000 meters. The main tectonic direction is NE, followed by the obvious NW. There are three relatively open depressions, ie, Beads 1, 2 and 3 (Figure 1 and 2). The three major depressions are pots