Analysis of Pool Forming Periods in Jurassic Yanqi Basin
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摘要: 着重用油藏地球化学分析方法探讨了焉耆盆地侏罗系油气藏的成藏时间和期次.油源对比表明八道湾组是主力烃源岩层, 三叠系烃源岩对八道湾组原油有一定贡献; 油气经短距离的侧向运移后, 沿断层通道向上进入三工河组和西山窑组.盆地经历了2次生烃, 侏罗纪末期为主要生烃期, 第三纪晚期为次要生烃期.储层流体包裹体分布特征、均一温度和组分特征、储层自生伊利石测年和油气成熟度分析都显示了焉耆盆地在侏罗纪中晚期的2次成藏作用, 即晚侏罗世以八道湾组低成熟油气的生成、运移和聚集为主的第1期成藏事件和侏罗纪末期以成熟油气的生成、运移和聚集为主的第2期成藏事件.受储层流体包裹体和自生伊利石形成机理的控制, 第三纪晚期生烃、成藏事件在流体包裹体和储层自生伊利石同位素年代学上均没有记录.侏罗纪末期是主要成藏期, 第三纪晚期是调整成藏和定型期.Abstract: This paper focuses on the study of the pool forming periods of the hydrocarbon by means of organic geochemistry. The correlation of petroleum sources shows that Jurassic Badaowan Formation is taken as main hydrocarbon source bed, Triassic is as the second source. Firstly, the hydrocarbon migrated laterally at short distance, then into Sangonghe and Xishanyao formations along the path of faults. This basin had undergone two periods of producing hydrocarbon, the main period of producing hydrocarbon is the end of Jurassic, secondly is the late of Tertiary. The distribution, homogenization temperature and components of fluid inclusions, dating of anthigenic illite, and maturity of hydrocarbon in the reservoir reveal two periods of pool forming in the Late-Middle Jurassic of the Yanqi basin, the first event for the generation, migration and accumulation of low maturity hydrocarbon happened during the late Jurassic Badaowan Formation, and the second event for maturity hydrocarbon happened during the end of Jurassic. The fluid inclusions and the isotope chronology of anthigenic illite in the reservoir haven't recorded the producing hydrocarbon and pool forming during the late of Tertiary. Main pool formations took place in the late of Jurassic, and has been adjusted with finality during the late of Tertiary.
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图 2 焉耆盆地侏罗系烃源岩生烃史
Fig. 2. Hydrocarbon-producing history of Jurassic hydrocarbon source rocks in Yanqi basin
图 3 焉耆盆地流体包裹体均一温度分布与成藏期
Fig. 3. Pool forming periods and distributions of homogenization temperature of fluid inclusions in Yanqi basin
图 4 有机流体包裹体正构烷烃碳数分布
Fig. 4. Distributions of carbon number of n-alkane in organic fluid inclusions
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