Abstract: Hydrocarbon inclusions exist in the dolomite veins of the Cambrian reservoir in Yingdong 2 Well.However,not all the dolomite veins contain two-phase aqueous inclusions,so it is too difficult to infer the formation temperature for generating dolomite veins without two-phase aqueous inclusions.On the basis of relationship between Raman characteristic peak and homogenization temperature of fluid inclusions in dolomite,the temperature for forming dolomite veins without two-phase aqueous inclusions could be determined.The analyses on the hosting position,forming stage of hydrocarbon inclusions and the homogenization temperature of the associated aqueous inclusions showed that there once existed three periods of hydrocarbon generation in the Cambrian dolomite of Yingdong 2 Well.The first period was in the Late Ordovician to the Silurian.Lots of hydrocarbon were generated and drained,and dark bitumen only left in the recrystalized dolomite at the diagenesis stage.The evolution of hydrocarbon appeared to stop during the Late Silurian to the Jurassic.The second period was in the Late Jurassic.Hydrocarbon generation was minor,and remained dark bitumen filling in the fractures.The third period was in the Himalayan period,which was also the main accumulation period of modern hydrocarbon reservoir.Huge amounts of oil and gas were preserved in pores and fractures.

Key words: Eastern Tarim Basin, Yingdong 2 Well, dolomite, fluid inclusion, Raman analysis, hydrocarbon accumulation history

摘要： 塔东地区英东2井寒武系中的烃包裹体存在于白云石脉中,而这些白云石脉内有的发育两相盐水包裹体,有的不发育两相盐水包裹体,对其形成温度的推测也不太确定.通过对不同温度下形成的白云石进行拉曼分析发现,可以通过拉曼特征峰来推测白云石的形成温度,从而推导不发育两相盐水包裹体的白云石脉的形成温度.根据烃包裹体赋存位置、形成期次及其伴生盐水包裹体均一温度与有关白云石的拉曼波谱分析,推断了本区寒武系白云岩矿物的形成及油气充注顺序.结合区域地质构造演化史和各井镜质体反射率特征,提出英东2井寒武系白云岩有3期生烃:奥陶纪末期到志留纪为第一期,在成岩期重结晶的白云石中见大量的黑色沥青质包裹体;志留纪末期到侏罗纪,烃演化处于终止阶段;侏罗纪末为第二期,此期生烃量少,只在裂缝中有黑色沥青质沥青残余;喜山期为第三期,在孔隙、裂缝中储集了油气,同时也是现存油气藏的主成藏期.

关键词: 塔东地区, 英东2井, 白云石, 流体包裹体, 拉曼, 成藏史