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普遍认为，与煤的煤化程度和埋藏深浅相比，煤在煤岩组成及其性质方面的差异与煤层甲烷的关系不甚明显。而笔者在研究显微组分的性质和成因时发现，等变质条件下，煤层甲烷含量与镜质体的一些性质有密切关系，不同时代煤和镜质体的孔隙特征和吸附特征不同。
It is generally accepted that the difference between coal in the composition and properties of coal and that of coal in the coal seam is not obvious compared with the degree of coalification and the depth of burial. In the study of the nature and origin of the microscopic components, we found that under the metamorphic conditions, the methane content in the coal seam is closely related to some properties of the vitrinite. The pore and adsorption characteristics of coal and vitrinite in different ages are different.