Abstract: This paper affirms the hydrocarbon source, studies the fluid inclusion and homogenization temperature based on the source rock thermal evolution and reservoir geothermal history in Shizigou field. By means of staging theory of petroleum generation, migration and accumulation, it is suggested that there exist three stages of hydrocarbon accumulations in Shizigou structure, they are E3 2, late N2 1 and late N2 3, which correspond to E1+2 primary oil generation stage, E1+2-E3 1 peak oil generation stage and E3 2 peak oil generation stage of source rocks, respectively. Finally, according to the process and history analysis of hydrocarbon accumulation, this paper presents the corresponding reservoir formation models in this area.

Key words: Qaidam basin, Shizigou field, source rock, hydrocarbon accumulation, model