阜新煤田镜煤和丝炭的有机地球化学特征及其热解性能研究

ORGANIC GEOCHEMICAL CHARACTERISTICS AND PYROLYTIC PROPERTIES OF VITRAIN AND FUSAIN

本文用近代有机地球化学方法(如红外光谱、气相色谱、质谱和色谱-质谱联用仪等)研究了阜新煤田主要煤层中的镜煤和丝炭的有机地球化学特征、研究结果表明两者均具有共同的高等植物母质来源,但形成于不同的环境,尤其是在氧化还原条件上:丝炭形成于相对氧化环境;而镜煤则在相对较还原的条件下形成的。镜煤和丝炭热解过程中产生的烃类主要是甲烷和其他气态烃,C_5^+-烃类的含量一般不超过10％,从而证实镜煤和丝炭可以是良好的生气母质,但不是好的生油母质。

Studies of the organic geochemical characteristics of vitrain and fusain in the Fuxin coal basin by using modern organic geochemical techniques (e.g. IR, GC, GCMS, etc.) show that both vitrain and fusain were derived from higher plants, but the redox conditions with respect to their formation environments are quite different. The fusain was formed in an oxidizing environment, and the vitrain in a relatively reducing environment. Research on the pyrolysis of vitrain and fusain by Rockeval and pyrolysis gas-chroinatography shows that hydrocarbons produced in the process of pyrolysis are dominantly gaseous hydrocarbons with methane> 85% (W. T) but C5+-hydrocarbon < 10% (W. T). This result suggests that the vitrain and fusain are gas-generating rather than oil-generating materials.