关键词: 塔东地区, 英东2井, 白云石, 流体包裹体, 拉曼, 成藏史

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