Abstract: This studied area is one of three marine facies sedimentary areas of Jurassic in China and belongs to one embranchment of Tethys. Xiaoshui formation of Genkou group and Shanglongshui formation and Jishuimen formation of Lantang group are dominated by bathyal black shale over 4,000 m in thickness, belonging to good source rock.. During Middle-Late Jurassic, for the Yanshanian movement became stronger gradually, South China block uplifted gradually and sea-water retreated toward south-east direction. The Middle Jurassic in eastern Guangdong is dominated by lake-facies, Tangxia formation of it is thick deep-water lake-facies mud, being a good source rock with local distribution. In Chaoshan depression, the Middle-Late Jurassic is still in shallow-sea environment and becomes bathyal environment toward Taixinan basin, where the continental slope area is characterized by good marine source rock. In Cretaceous, there exist a string of bead-like lake basins along Lianhuashan and Heyuan deep faults, dominated by the sediments of river facies and lake facies intercalated with volcanoclastic sedimentary rock. Because of strong activity of the third episode of Yanshanian movement, Chaoshan depression and Taixinan basin are all uplifted, when the Cretaceous in Chaoshan depression assumed river and lake facies sediments, while Taixinan basin was still in marginal sea developed with continental-oceanic interaction environment sediments. So, dood marine source rock could only be found in Taixinan basin. It is believed that the Jurassic marine sediments in continental slope area of northeastern South China Sea possess greater potentials of hydrocarbon generation and oil Resources, and should be one of new domains to be explored and developed in future.

Key words: East Guangdong, South China Sea, Taixinan basin, Chaoshan depression, marine Jurassic, source rock, hydrocarbon prospect