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对鄂尔多斯盆地同一地区侏罗系煤、煤系泥岩和炭质泥岩生烃全过程的模拟实验结果表明:不同种类煤系源岩热解生油特征存在较大的差异;与典型的湖相或海相源岩相比,这3种煤系源岩生油潜力都比较低。生油潜力最高的为煤系泥岩,其最大生油量约为20mg/gTOC,而煤和炭质泥岩的生油潜力几乎只有煤系泥岩的一半。因此,煤系源岩单独大规模形成油藏的可能性较低。煤岩、煤系泥岩及炭质泥岩最大生成烃类气体气量为184～212mL/gTOC,在3种源岩中煤的生气量最大,而煤系泥岩的最大生气量只有3m3/t岩石;煤和炭质泥岩生成气体的碳同位素相近,而煤系泥岩生成甲烷碳同位素值要比煤同温度生成的甲烷碳同位素值偏低3‰～5‰。3种源岩模拟生气实验结果表明:煤应该是煤成气的主要贡献者。
The simulation results of the whole process of hydrocarbon generation of Jurassic coal, coal series mudstone and carbonaceous mudstone in the same area of Ordos Basin show that there are great differences in pyrolysis oil generation characteristics of source rocks of different kinds of coal series. Compared with the marine source rocks, all three coal-derived source rocks have relatively low potential for oil generation. The highest potential for oil generation is coal-bearing mudstone with a maximum oil production of about 20 mg / g TOC, whereas coal and carbonaceous mudstones have nearly half the potential of coal-bearing mudstones. Therefore, it is less likely that the coal-based source rocks alone form large-scale reservoirs. Coal, rock mudstone and carbonaceous mudstone have the maximum gas production of 184 ~ 212mL / gTOC, the maximum gas generation of coal in the three source rocks, and the maximum gas generation of coal series mudstone is only 3m3 / t rock. Coal Carbon isotopes of carbonaceous mudstone are similar to those of carbonaceous mudstone, while the values of methane carbon isotopes of coal-formed mudstone are 3 ‰ ~ 5 ‰ lower than that of coal. The results of simulated gas-generating experiments show that coal should be the main contributor to coal-formed gas.