成煤过程

与全煤样相比较，该煤样抽提物的藿烷衍生物13C值则减少8～34‰，标志在成煤过程中甲烷的细菌循环起着作用。

Hopane derivatives in this coal extract are depleted in 13C compared to the bulk coal by 8 ~ 34 ‰, suggesting that bacterial cycling of methane played a role during the formation of this coal .

江西省晚古生代海陆演化与成煤过程

Evolution of Late Palaeozoic Sea and Land and Coal-forming Process in Jiangxi , China

由于复杂的成煤过程，煤炭中微量元素呈现独特的集散规律。

Owing to complex coal-forming process , the trace elements in coal present unique accumulation and scatter laws .

煤层气又称煤层瓦斯，它是在成煤过程中形成并赋存于煤层中的一种非常规天然气资源。

Coalbed methane ( CBM ), which is also called coal seam gas , is a kind of unconventional natural gas . It develops with the process of coal forming and occurrence in the coal seam .

所研究的煤中可溶低分子化合物有两种来源：一是原生的，它来源于成煤母质，二是后生的，源于成煤过程中生成的降解产物。

Studied coal soluble low-molecular-weight compounds have two sources : First , the original , and it comes from coal-parent material , the second is younger , from the process of coal-generated degradation products .