GEOLOGICAL CHARACTERISTICS OF EAST CHINA SEA BASIN AND COMMENTS ON THE PETROLIFEROUS PROVINCE

The East China Sea Basin is a giant Cenozoic sedimentary basin and the thickness of its sedimentary sequences exceeds ten thousand meters. The basement of the basin probably had experienced Hercynian folding, then had furthermore complicated by igneous rocks. The formative evolution of the basin may be divided into four stages, i.e. faultdown, downwarp, depression and draping during Eocene,Oligocene and Pliocene-Quaternary times, respectively. The tectonic framework is differentiated between the eastern and the western zones and between the northern and the southern blocks. There are various types of oil-gas pools, such as the gas pools and conden-sate oil pools in sandstones, the oil pools in the basement and the oil-gas pools in reefs. It is believed that giant oil-gas pools will be discovered by further exploration activities and detailed researches.