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琼东南盆地的发展经历了由断陷到坳陷的演化过程，盆内充填了巨厚的沉积地层，该套地层在上、下第三系内可识别出14个层序，断陷期6个坳陷期8个。断陷期层序发育主要受控于幕式构造运动，层序由冲积扇、河流、湖泊、扇三角洲和碎屑滨岸体系沉积的粗碎屑岩组成。坳陷期层序发育主要受控于全球海平面变化并具有典型被动大陆边缘特征，低位域由企底扇、斜坡扇和海底水道沉积组成；海进体系域和高位体系域由三角洲、碎屑滨岸、碳酸盐台礁和浅海陆架体系沉积组成．
The evolution of Qiongdongnan Basin experienced the evolution from fault depression to depression. The basin was filled with thick sedimentary strata. In the upper and lower Tertiary stratigraphic series, 14 sequences were identified, and the faulting period 6 A depression period of eight. The sequence of fault depression is mainly controlled by the episodic tectonism. The sequence consists of alluvial fans, rivers, lakes, fan delta and coarse clastic rocks deposited on the debris shore system. The sequence development of the depression is mainly controlled by global sea level changes and has the characteristics of typical passive continental margins. The low-level zones are composed of fan beds, ramp fans and seafloor sediments. The marine system tract and highstand system tract are composed of delta, Coastal banks, carbonate Taiwan reefs and shallow shelf system sediment composition.