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Hydrocarbon Generation Kinetics of Low Cretaceous Nantun Source Rock in Peripheral Sags of Hailar Basin, China

Summary In order to clarify the hydrocarbon generation potential and evolution stage of Low Cretaceous Nantun source rock in Hongqi, Dongming and Yimin sags of Hailar Basin, the hydrocarbon generation kinetics was conducted by using gold tube autoclave. The results showed that the kinetic parameters of gaseous hydrocarbons were different, and the main frequency activation energy increased orderly from Dongming to Hongqi and Yimin sags. Among the kinetic parameters of liquid hydrocarbon, the average and main frequency activation energy in Hongqi were the lowest, the distribution of activation energy in Yimin showed bimodal characteristic, the main frequency activation energy increased orderly from Hongqi to Yimin and Dongming sags. The hydrocarbon generation history recovery indicated that the K1n1 source rock entered the oil generation threshold in early Cretaceous, and it is still in the early stage of low to mature stage. The oil conversion rate was 12.67%∼39.50%, only a small amount of hydrocarbon expulsion occurred. The key factor restricting oil-generating is that organic matter hasn’t reached the peak of hydrocarbon generation. The focus on petroleum exploration is to find underlying Tongbomiao and Tamulangou Fm with high paleogeotherm and strong oil generation potential or local mature areas of source rocks of Nantun Fm.