Abstract:

Thousands of islands are scattered around in the Yellow and East China Seas,comprising Changshang Island in the north,the Southern Penghu Islands in the south and Diaoyu Dao in the east.Rock outcrops in these islands,which constitute basements of sedimentary basins,play an important part in their development.The Yellow Sea basin,with Meso-Cenozoic sediments of 6,000m thick,contains source rocks and several dozens of tectonic traps favourable to oil and gas accumulation.Being centrolled by tectonic system,it has undergone two stages of development,i.e.the early fault-bound depression and the later regional depression,both accompanied by sedimentation.The East China Sea basin,being filled with Cenozoic sediments of 10,000m thick,is rich in organic matters brought into the basin by the Yangtze and other rivers,and complicated by clusters of enormous juxtaposed tectonic belt and zones,becomes most potential for oil and gas exploration.The basin is a back-arc one,its origin and development are controlled in some extent by the interaction between the Pacific and Eurasia plates.