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运用有机岩石学和有机地球化学方法,对伊犁盆地侏罗系煤岩有机显微组分特征和生烃潜力进行了综合研究.结果表明:伊犁盆地中下侏罗统八道湾组和西山窑组煤有机岩石学及地化特征有较大的差异.八道湾煤中镜质组、壳质组含量远远高于西山窑组;反映生烃性能的有机地化指标也优于西山窑组.认为八道湾组煤属较好的煤成烃源岩,而西山窑组煤相对为较差的烃源岩.八道湾组虽然富含有利生烃组分,但由于成熟度偏低,煤系地层中砂岩比例较高,不易形成大规模的油气聚集.
Using organic petrology and organic geochemical methods, the characteristics of organic micro-components and hydrocarbon generation potential of Jurassic coal-bearing rocks in Yili basin are comprehensively studied. The results show that there are great differences in organic petrology and geochemistry characteristics of the Lower Reaches of Jurassic Badaowan Formation and Xishanyao Formation in the Yili Basin. The content of vitrinite and chitin in Badaowu coal is much higher than that in Xishanyao formation. The organic geochemical index reflecting hydrocarbon generation is also superior to Xishayao formation. It is considered that the coal in the Badaowan Formation is a better source rock and that the coal in the Xishanyao Formation is relatively poor source rock. Although the Badaowan Formation is rich in favorable hydrocarbon components, due to the low maturity, the proportion of sandstone in the coal measures is relatively high, which makes it difficult to form large-scale accumulation of hydrocarbons.