Abstract:

There is the active frequently thermal fluid, the vein developed in Budate Group of Hailaer Basin. The three types of hydrocarbon inclusions in ankerite vein and quartz vein are the rich CH4 gas hydrocarbon inclusion, the liquid hydrocarbon inclusion and the liquidgas two phases organic inclusion in early, middle and alter periods respectively. According to study of the hydrocarbon inclusions of host mineral, homogenization temperature and composition of host mineral, that the formation of ankerite vein is owing to magmatism and lowtemperature hydrothermal activity; the formation of quartz vein is probably due to deep stated fluid. The rich CH4 gas hydrocarbon inclusion probably came from the deep; the middle period liquid hydrocarbon inclusion of ankerite vein formed in the fracture while hightemperature metamorphic water took hydrocarbon of wall rock during the thermal event; the later liquidgas two phases hydrocarbon inclusion in ankerite vein, quartz vein stand for oil and gas migration and accumulation. In combination with the reconstruction of the burial history and thermal history, it is recognized that the time of hydrocarbon entrapment in Budate Group is 60~105Ma, beginning at sedimentary time of Yimin Formation and until to the Qingyuangang Formation.

Key words: Hailar Basin, fluid inclusions, homogenization temperature, source of fluid, accumulating stage