桦甸油页岩有机岩相特征及其富集特性

Petrology and enrichment characteristics of organic matters in Huadian oil shale

为了研究油页岩中有机组分结合特性对有机质分离富集的影响,利用薄片透射光、反射单偏光、反射荧光等煤岩学研究手段研究桦甸油页岩中有机组分的种类、含量及赋存状态,并利用两种密度分离手段研究油页岩中有机质的解离特性。结果表明,桦甸油页岩有机质的变质程度较低,有机显微组分以沥青质体为主,占85.8%,镜质组和惰质组含量较低;有机质与矿物结合紧密,形成有机-矿物复合体,密度分离方法对有机质与矿物质分离效果有限;浮沉实验小于1.40 g/cm3密度级样品的热解失重量及失重速率均低于较高密度级产物,这与颗粒状镜质组、惰质组与矿物质结合程度相对较差,在较低密度级产物中富集有关。

The enrichment characteristics of organic matters were determined by its petrology. The types and contents of macerals in Huadian oil shale were examined with 3 common microscope lighting conditions（ transmitted light,reflected polarized light and reflected fluorescent light）. Then two separation methods based on density difference were used to study liberation of organic mattes from minerals. A lowdegree of metamorphism was found for organic matters in Huadian oil shale. The macerals were dominated by bituminite accounting for 85. 8%. The contents of vitrinite and inertinite were low. Closely integrated with minerals,the organic matters were formed as organic-mineral aggregates. It was difficult to separate the organic matters from minerals using physical methods. Both the weight loss and differential weight loss of samples with density1.40 g / cm3 were lower than that of higher density from float-and-sink analysis. This was attributed to that a small amount of vitrinite and inertinite particles was enriched in lowdensity product due to their less integration with mineral matter.