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鄂尔多斯盆地侏罗纪延安组煤系地层可否成为该盆地另一套油源岩的问题，历来存有争议。系统的煤岩和有机岩石学分析表明：煤中倾油性的壳质组分含量低，基质镜质体的类型也不利于生油，因此，延安组煤系有机质不大可能形成具有工业价值的煤成油藏
Whether the coal measures strata of the Jurassic Yan’an Formation in the Ordos Basin could become another source rock in the basin has always been controversial. The systematic analysis of coal-rock and organic petrology shows that the content of oil-bearing chitin in coal is low and the type of matrix vitrinite is not conducive to oil generation. Therefore, it is unlikely that the Yan’an Formation coal-based organic matter is of industrial value Coal into the reservoir