THE LOWER CRETACEOUS SOURCE ROCKS FROM EASTERN BASIN GROUP IN THE PERIPHERY OF SONGLIAO BASIN: Sedimentary Characteristics and Hydrocarbon Generation Potential

The eastern basin group in the periphery of Songliao Basin, located in the east of Northeast China, includes 39 small- and medium-scale sedimentary basins, covering an area about 52×10⁴ km². Based on the sedimentary characteristics of source rocks in the eastern basin group, through comprehensive analysis of organic geochemistry of the Lower Cretaceous source rocks in Sanjiang, Boli, Tonghua and Hongmiaozi basins, the paper identifies the characteristics and distribution rule of organic matter abundance, maturity and types in the Lower Cretaceous source rocks of the study area, and analyzes the geological factors that affect regular changes of the above indexes regionally, to improve the basic geological understanding of oil-gas resources in the area and provide scientific basis for the oil-gas survey and exploration in Northeast China.