Abstract: This paper runs a numerical simulation of the history of burial, thermal evolution and hydrocarbon generation in Funing Formation, and analyzes lithofacies features and homogeneous temperature of fluid inclusions, based on previous study. The results show that hydrocarbon source rock in Funing Formation experienced continual subsidence period, lifting period and resubsidence period in turn. Hydrocarbon was generated from the late Paleocene Funing Formation to the late Eocene Sanduo Formation, and continuously charged and accumulated at Eocene Sanduo Formation. The infill injection of the deep concave zone occurred earlier than that of the north slope. It could be judged that the Sanduo period was the main hydrocarbon accumulation period of Gaoyou Sag. The main hydrocarbon accumulation period matches with the hydrocarbon generation and exclusion period and the trap formation period, which is favorable for hydrocarbon accumulation in the area

Key words: Subei Basin, Gaoyou Sag, Funing Formation, hydrocarbon accumulation period, thermal evolution, fluid inclusion