Abstract: As a target area of increasing reserves and production since “the ninth five-year plan”, in Taibei sag of Turpan-Hami basin operated by Turpan-Hami Oilfield Company,eight hydrocarbon bearing structural zones have been found one after another. This study analyzed the differences of Jurassic source rocks in west-eastern Taibei sag,and classified its crude oil group into three formations corresponding respectively to Type “A” crude originated from limnic shale in Qiketai formation, Type “C” crude from coal seam in Shuixigou group and Type B” crude (compound hydrocarbon) from Shuixigou coal measures as source rock. These types of hydrocarbons are of their different accumulation stages due to the differences in source rock maturity and in enormous generating/ expelling hydrocarbon stage. For Shuixigou group coal measure as source rocks, its hydrocarbon accumulation stage is mostly in late Yanshan tectonic movement, while for Qiketai formation as source rocks the stage mainly in Himalayan movement period.

Key words: Turpan-Hami basin, crude oil group, maceral, geochemical feature, petroleum accumulation stage