Abstract: Influenced by multi-stage tectonic movement, buried hill in Liaodong Bulge in Liaodong Bay Depression experienced complex tectonic evolution. Based on the newly processed 3D seismic data and drilling data, the stratigraphic structure and structural features of buried hill in the south section of Liaodong Bulge are analyzed, and the tectonic evolution and its influence on hydrocarbon accumulation are discussed. The results show that a double-layer structure of the Mesozoic and Archean were developed of buried hill in the south section of Liaodong Bulge, which experienced four stages of tectonic evolution, namely, the development stage of material basis of buried hill (before the Middle Triassic), development stage of buried hill structure (Middle-Late Triassic to the end of the Cretaceous), reconstruction and deep burying stage of buried hill (Paleocene to the end of the Oligocene), and the stably deep burying stage of buried hill (Miocene to Holocene); Controlled by the basement and strong strike slip, buried hill in the south section of Liaodong Bulge was uplifted from the deposition period of the end of the third member of the Oligocene Shahejie Formation (E₂s₃) to the end of Dongying Formation (E₃d). Two types of faults, strike slip fault and extensional fault, were developed in buried hill in Liaodong Bulge, among which strike slip fault controlled the structural framework of Liaodong Bulge and played a key role in the formation of buried hill, while the dual action of extension and strike slip controlled the fracture development in the interior of the buried hill and improved the reservoir performance.

Key words: south section of Liaodong Bulge, inner buried hill, structural feature, tectonic evolution, exploration potential