准噶尔盆地石西油田油气藏地球化学研究

通过对石西油田包裹体均一温度、包裹体中油气组分(古油气组分)和储集岩开放孔隙中油气组分(现今油气组分)的分析和对比，研究了石西油田油气藏的成藏期、成藏期次、油气源及油气埋藏演化史，认为：石西油田的油气藏至少发生过两期以上的油气运移和聚集过程；古生界成熟的原油并不完全是先期成藏的低成熟原油在储集层中热演化的结果；像罗系油气藏受构造、断层控制，其原油密度较石炭系原油密度高，成熟度明显低于石炭系原油。

Geochemical Study for Oil-Gas Pools of Shixi Oilfield

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 oilfeld＇s oil-gas pools. It is considered that the oil-gas pools of Shixi oilfield have experienced at least two stages of hydrocarbon migration and accumulation. The matured crude oil of Paleozoic to a greater extent is not the result of the under-matured crude stored in previously formed pool then subject to in-situ 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.