伊犁盆地侏罗系煤岩生烃潜力评价

Evaluation of Hydrocarbon generating Potential of Jurassic Coal in Yili Basin

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．

By organic petrological and geochemical methods,the authors discuss the characteristics of the organic macerals and the hydrocarbon generating potential of Jurassic coal in Yili Basin.It is shown that the middle and lower Jurassic coal in Badaowan formation is different from that in Xishanyao formation in organic petrological and geochemical characteristics.The contents of vitrinite and exinite in Badaowan coal are more than those in Xishanyao coal,and the organic geochemical indexes of the former are better than those of the latter which reflect hydrocarbon generating potential.Compared with Xishanyao formation,the coal in Badaowan formation is better coal formed hydrocarbon source rock.But it is difficult to form a large hydrocarbon accumulation in Yili Basin because of lower maturity of hydrocarbon source rock and higher content of sandstone in the strata.