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在地史过程中煤岩显微组分的相对含量是变化的，用其现今实测值代替地史演化过程中的含量值计算生烃量势必产生误差。提出了一种恢复地史过程中煤岩显微组分相对含量的方法并进一步研究表明：煤岩中稳定组的相对含量在地史过程中变化最大，其次是镜质组和丝质组。用煤岩当前显微组分相对含量计算的地史过程中甲烷气、重烃气和液态烃的生成量较实际值要小，它们的最大偏差在理论上分别可达到１４．０４％、３２．２５％和３２．７１％。
In the history of the process of the relative content of coal and rock micro-components is a change, with its present value instead of the history of the evolution of the value of the amount of hydrocarbon generation is bound to produce errors. A method to restore the relative content of the microscopic components of coal and rock during the history of the geo-history was proposed. Further studies showed that the relative content of the stable group in coal and rock changed most during the geo-history, followed by vitrinite and siliceous groups. The generation of methane gas, heavy hydrocarbon gas and liquid hydrocarbon in the geo-historical process calculated from the relative contents of the present microscopic components of coal and rock are smaller than the actual value, and their maximum deviation can reach 14.04% in theory, respectively .25% and 32.71%.