Abstract: A series of the Jurassic coals in Santanghu Basin has been studied by Rock-Eval pyrolysis, white microscopy, and element analysis, with an aim of evaluation of coals type. The results obtained by Rock-Eval pyrolysis are different from those by the other approaches. The influences, such as maceral composition, deposit-diagenetic environment and maturity, have been analysed, the conclusion is that high-content of hydrogen-rich maceral(4%-19%) in the coals and the maturity are important effects on hydrogen index, H/C atomic ratio, and types of coal. The method in evaluating coal types was discussed as well in the present paper.

Key words: coal, Rock-Eval pyrolysis, organic petrology, type of organic matter

摘要： 对新疆三塘湖盆地侏罗系11个煤样进行了Rock-Eval热解分析、显微组分定量分析、镜质体反射率测定及元素分析，不同方法所评价的煤有机质类型存在着一定的差异。通过对显微组分构成、沉积-成岩环境及有机质成熟度等因素的综合剖析，认为三塘湖盆地侏罗系煤中含量较高的富氢显微组分(4%～19%)和成熟度是影响氢指数(I_H)、H/C原子比的主要因素，并对煤有机质类型的评价产生了一定的影响。探讨了煤有机质类型评价的思路与方法。

关键词: 煤, 热解分析, 有机岩石学, 有机质类型