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鄂尔多斯盆地石炭系海相烃源岩与下奥陶统碳酸盐岩的对比结果表明，石炭系海相烃源岩虽然不如下奥陶统碳酸盐岩厚，但其生烃能力远高于后者，与奥陶系风化壳储集层的配置情况也好于后者，并且产物也具油型特征，表明奥陶系风化壳气藏的油型气成分来自石炭系海相烃源岩；奥陶系风化壳气藏的天然气是以上古生界煤成气为主、上古生界石炭系油型气为辅的混合气。这一观点既能够很好地解释鄂尔多斯盆地中部古生界自上而下气藏序列天然气成分及碳同位素组成的差异，还可以更好地说明为何风化壳气藏天然气以煤成气为主。
The comparison between Carboniferous marine source rocks and Lower Ordovician carbonate rocks in the Ordos Basin shows that the Carboniferous marine source rocks are not as thick as Lower Ordovician carbonate rocks, but their hydrocarbon generation ability is much higher In the latter case, the configuration of the Ordovician weathering crust reservoir is also better than that of the latter, and the product is also oil-based, indicating that the oil-gas composition of the Ordovician weathering crust gas reservoir is derived from carboniferous marine source rocks The natural gas of the Ordovician weathering crust gas reservoirs is mainly composed of the Upper Paleozoic coal gas and the Upper Paleozoic Carboniferous oil gas. This view can not only explain the differences of the composition and carbon isotope composition of natural gas in the Paleozoic upper-middle gas reservoirs in the central Ordos Basin, but also better explain why the natural gas in the weathered gas reservoirs is mainly coal-based gas.