北羌塘盆地龙尾湖地区流体包裹体特征及油气成藏

Fluid Inclusion and Hydrocarbon Accumulation in Longweihu Area of North Qiangtang Basin

通过北羌塘盆地龙尾湖地区中侏罗统夏里组和上侏罗统索瓦组储集层流体包裹体产状、均一化温度及有机包裹体荧光颜色等分析表明,该区包裹体具有多种类型,多呈串珠状、条带状分布,均一化温度常具有多个峰值,有机包裹体一般发蓝白-黄绿色荧光等特征,结合烃源岩有机质演化和油源研究认为,该区分别于晚侏罗世末期-早白垩世早期和中新世康托期发生两次大规模的生烃-油气运移-聚集成藏。

The occurrence and homogenization temperature of fluid inclusion as well as the fluorescent indicator of organic inclusion from Xiali formation （Middle Jurassic） and Suowa formation （Upper Jurassic） in Longwei area of north Qiangtang basin are analyzed, indicating that the inclusion in this area is of multiple types with braded and banded distribution. The homogeneous temperature is of multiple peak values. The organic inclusion is of characters of blue-white and yellow-green fluorescence. It is believed by combination of the source rock＇s organic matter evolution and oil source studies that there existed two large-scale processes of hydrocarbon generation, migration and accumulation in late stage of Late Jurassic to early stage of Early Cretaceous and Kangtuo stage of Miocene, respectively.