藻煤、烛媒、腐植煤共生煤层的有机地球化学特征及成烃评价

作者对产于山西的共生藻煤、烛煤、腐植煤分别进行了显微煤岩鉴定和有机抽提、族组分析和色谱——质谱研究。结果表明藻煤对与其共生的腐植煤镜质组反射率有显著的抑制作用,并影响腐植煤的可抽提率和正烷烃分布特征。藻煤中的粘土矿物抑制烃类析出。在相同热演化条件下藻煤的成熟度滞后于腐植煤。各类型煤的有机地球化学特征所提供的母质、形成环境以及成熟度等信息,与煤岩研究结果相吻合。藻煤和烛煤是较好的油源岩,并有大大提高与其共生的腐植煤的生油能力的作用。上述研究成果对煤成烃机理研究和生烃能力评价有实际意义。

The Organic Geochemkal Character of the Intergrown Coal-Seam Composed of Boghead Coal,CaeneJ Coal and Humic Coal,and its Effect on the Formation of Hydrocarbon

According to the study of microscopic determination,organic extraction,family grouping analysis.colorimeter and mass spectrographic analysis of the intergrown boghead coal,cannel coal and humic coal from shanxi.the results show that the boghead coal has remarkable restriction on the reflection of vitrinite of the intergrown humic coal,and that it also influences extraction rate and normal alkane distribution character of humic coal,The clay minerals in the boghead coal restrains separation of hydrocarbons.Under the same heat evolution condition,the maturity of boghead coal lags behind the humic coal,The information of matrix,by organic geochemical character of coals are identical with the results of coal petrological study,the boghead coal and cannel coal are better sources of oil rocks and also have the effects of greatly improving oil extracting potential of the intergrown humic coal.