Abstract: Through the analysis and correlation made upon the uniform temperature of inclusions, the oil-gas components (ancient component) within the inclusions, and the oil-gas components(current components) in open pores of reservoir rocks, this paper studies the forming time of oil pool, timing for pool formation, hydrocarbon source and evolution history of buried hydrocarbons, in Shixi oilfield's oil-gas pools. It is considered that the oil-gas pools of Shixi oil-field have experienced at least two stages of hydrocarbon migration and accumulation. The matured crude oil of Paleozoic to agreater extent is not the result of the under-matured crude stored in previously formed pool then subject to insitu thermo-evolution. The Jurassic oil-gas pools are controlled by geological structures and faults,and its crude oil density is higher than that of Carboniferous, while its maturity is obviously lower than that of Carboniferous crude.

Key words: Junggar basin, Shixi oilfield, reservoir formation, time, inclusion, ancient temperatures, sourcebed, geochemical characteristic