准噶尔盆地侏罗系煤系烃源岩有机显微组成及意义

通过对准噶尔盆地侏罗系的18个煤系烃源岩样品，进行岩石热解、有机碳测试、镜质体反射率检测、显微组分鉴定等实验分析，发现：热解法和显微类型指数法得到的有机质类型评价结果相矛盾。利用热解法判断煤系烃源岩有机质类型时，煤的有机质类型最好、炭质泥岩次之、泥岩最差；而利用有机显微类型指数法判断有机质类型时，泥岩有机质类型最好、炭质泥岩次之、煤最差。进一步研究发现，传统认为不生烃的镜质组具有重要的生烃贡献。镜质组的生烃能力认识是导致两种有机质类型评价方法出现矛盾的关键。对于煤系烃源岩而言，利用热解法进行有机质类型划分更加的准确且经济。

Organic Macerals of Source Rocks of Jurassic Coal Measures in Junggar Basin and Their Significance

Based on the analysis of 18 coal-measure source rock samples of Jurassic in Junggar basin, the results of rock pyrolysis, organic carbon test, vitrinite reflectance test and microscopic component identification show that the evaluation results of organic matter types obtained by pyrolysis method and microscopic type index method are contradictory.When pyrolysis method was used to determine the type of organic matter in source rocks of coal measures, the type of organic matter in coal measures is the best, followed by carbonaceous mudstone, and mudstone is the worst; while when organic micro type index method was used to determine the type of organic matter, the type of organic matter in mudstone is the best, followed by carbonaceous mudstone, and coal is the worst.It is found that the vitrinite, which is traditionally believed to be non hydrocarbon generating, has an important contribution to hydrocarbon generation.The recognition of hydrocarbon generating ability of vitrinite is the key to the contradiction between the two methods of organic matter type evaluation.For the source rocks of coal measures, the classification of organic matter types by pyrolysis method is more accurate and economical.