Abstract: Great progress has been made in Paleozoic oil and gas exploration in China. Several large and medium-sized oil and gas fields have been found in the Tarim, Sichuan and Ordos Basins. However, there are still divergences on the amounts of the Paleozoic oil and gas resources in northeast China. On the basis of predecessors’ studies, this paper summarizes and discusses the Paleozoic stratigraphic sedimentation, hydrocarbon resource potential, oil-forming assemblage and hydrocarbon accumulation conditions in northeast China, and points out the directions of oil and gas exploration. The study shows that:The northeast China during Late Paleozoic consisted of Ergun, Songnen-Zhangguangcai Mt., Jiamusi and Xingkai micro landmasses. The Paleozoic strata in this area are relatively developed completely on the pre-Sinian crystalline metamorphic basement. The Lower Paleozoic is marine sediments, and the Upper Paleozoic is paralic sediments.The magmatic activity in northeast China was very strong with complete lithologies. The Hercynian magmatic activity was the most prominent, mainly intermediate acid volcanic rocks.The Paleozoic strata in northeast China are completely developed with multiple sets of source rock-reservoir-cap rock assemblages. The oil and gas accumulation conditions are favorable, dominated by tight gas. It is the main domain for natural gas exploration in the future.

Key words: northeast China, Paleozoic, prospect of oil and gas resources, hydrocarbon accumulation condition