从显微煤岩学角度探讨六盘水地区龙潭煤系低煤级煤的生烃状况

LOW RANK COAL HYDROCARBON GENERATING STATE OF LOGNTAN COAL BEARING FORMATION IN LIUPANSHUI AREA OF GUIZHOU PROVINCE

从显微煤岩学角度探讨了贵州六盘水地区晚二叠世龙潭煤系煤的生烃状况。研究表明，树皮体和基质镜质体是研究区煤岩显微组成中主要的两种富氢组分，“富镜质体较富树皮体”是主采煤层典型的煤岩组合特征，在成烃演化过程中，富氢镜质体和树皮体对生烃作出了主要贡献。渗出沥青体充填于镜质体微裂隙或细小孔洞以及丝质体胞腔中。这些微裂隙和胞腔对煤成油的保存、富集和运移起到关键作用。显微组分间的这种配置关系为煤成油藏的形成提供了非常有利的条件。六盘水地区具有形成煤成油藏的母质条件，同时在煤层中具有较好的保存富集以及运移条件，如果存在有利的地质背景与之相配合，研究区煤成油藏的勘探开发工作将具有十分乐观的前景。

Liupanshui area is an important energy base in South China. The authors mainly discuss the coal hydrocarbon generating state of Longtan coal bearing formation through microlithology. Based on kinds of related factors, following conclusions are made: barkinite and esmocollinite are two important kinds of hydrocarbon rich macerals, and the special microlithotype group of main coal bed is“vitrinite richest barkinite richer”. They pay more contribution to the hydrocarbon generating process. Bituminite exists as the microfracture filling, micro hole filling and fusinite cell cavity filling. This special kind of constitution relationship provides beneficial condition for the forming of oil derived from coal. The most impotant conclusion is that there has not only the better source rock condition but the better accumulating and migrating conditions for the oil derived from coal in the main coal bed. If there exists favourable geological conditions, the exploration and exploitation studies on oil derived from coal must be prospective.