海拉尔盆地布达特群流体包裹体特征及来源

海拉尔盆地布达特群热流体活动频繁，脉体发育。脉体中发育3种不同类型烃类包裹体，即旱期富CH₄气态烃类包裹体、中期液态烃类包裹体、晚期气液两相烃类包裹体。通过对3种烃类包裹体宿卞矿物特征、均一温度测定、宿主矿物化学成分的分析，指出铁白云石脉的形成与岩浆成因及低温热液作用有关，石英脉的形成可能来源于深部流体。早期石英脉中富CH₄气态烃类包裹体可能同样来自于深部;中期铁白云石脉中液态烃类包裹体是热事件作用中高温变质水分解并携带了围岩中烃类物质进入裂缝中沉淀而成的;晚期石英脉、铁白云石脉中气液两相烃类包裹体则代表了布达特群油气成藏时油气运移、聚集的结果。结合沉积理藏史和热演化史恢复，认为布达特群成藏时间为60- 105 Ma，即伊敏组沉积初期开始，一直延续到青元岗组。

THE CHARACTERICS OF FLUID INCLUSIONS AND THE SOURCE OF FLUIDS IN BUDATE GROUP,HAILAR BASIN

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.