关键词: 中国南方, 海相, 叠合盆地, 烃源岩, 油气系统, 油气藏分布, 油气勘探

Abstract: The comprehensive study of tectonics-sequence stratigraphy-petroleum system showed that five sets of major regional and some local source rocks developed in the tectonic evolution of South China,including the Lower Cambrian and Lower Silurian in Caledonian cycle,Middle Permian and Upper Permian in Hercynian cycle,and Lower Triassic in Indo-Sinian cycle.Due to inhomogeneous maturity of source rocks in this area,gas exploration would focuse on the Lower Paleozoic,and oil and gas exploration would be in the Upper Paleozoic.The reformation from Indo-Sinian cycle to Hymalayan cycle controlled hydrocarbon accumulation in the Mesozoic-Cenozoic basin and marine sequences in the southern China.The petroleum systems formed in the medium-late period of the superimposed basins should have the most potential of hydrocarbon exploration.The primary and secondary oil-gas pools mainly distributed along the sedimentary facies favorable for hydrocarbon generation,and these oil-gas pools were controlled by the ancient uplift and slope.The comprehensive evaluation concluded that the important areas for petroleum exploration in marine sequences of the southern China will be in the superimposed basins along the margin of Yangtze landmass,Subei-southern South Yellow Sea Basin and the marine sequences preserved under the over-thrust nappe along the northern margin of Jiangnan uplift.

Key words: South China, marine sequence, superimposed basin, source rock, petroleum system, hydrocarbon reservoir distribution, petroleum exploration