关键词: 珠江口盆地, 特提斯, 中生代, 海相地层, 含油气系统, 勘探前景

Abstract: The Mesozoic tectonic revolution of continental margin in the northern area of South China Sea and the regional geology of its ambient region was studied. The result shows that this region is the eastern part of Tibet main Tethys ocean(sea).Analysis on the characters of seismic reflection,gravity filed,interval velocity,rock's density,tectonic features of depression,well-to-well interpretation and sedimentary facies of surroundings proved that Mesozoic marine strata are widespread in the eastern area of Pearl River Mouth basin.Chaoshan depression and Hanjiang depression are all Mesozoic residual depression where three sets of Mesozoic marine sequences were deposited.Chaoshan depression is composed of four structural units,including northern slope belt,northern depression belt,central massif belt and southern depression belt.The faults of the Mesozoic in Chaoshan depression can be classified into NE trend reverse fault,NE trend normal fault,EW trend normal fault and NW trend strike-slip fault. Associating with the study of outcrops and cores of ambient region,as well as geology and geophysics of this region, it is regarded that the Mesozoic is of good source rocks,and the area may have three sets of efficient reservoir-cover rock systems.The petroleum system of this area shows that Mesozoic of the eastern part of Pearl River Mouth basin may be an important prospect for oil and gas exploration.

Key words: Pearl River Mouth basin, Tethys ocean, Mesozoic age, marine strata, petroleum system, exploration prospect