三塘湖盆地侏罗纪煤系烃源岩的热演化研究

采用有机岩石学全岩分析方法,结合有机地球化学分析资料,以新疆三塘湖盆地侏罗纪煤系烃源岩的热演化进行了研究。三塘湖盆地侏罗纪煤系烃源岩的热演化既有共性,又有其特殊性,前者主要表现在镜质组反射率R、孢子体荧光参数（λ_max、Q、I₅₄₆）和分子地球化学参数上,它们均显示重要的热演化指示意义;后者主要表现在,热演化指标与现今埋深关系不大、热演化程度“同层相近”不同有机显微组分差异演化和有机质热演化具有阶段性等方面。在此基础上,初步建立了三塘湖盆地侏罗纪煤系烃源岩的成烃模式。 

A study on thermal evolution of organic matter in Jurassic coal-bearing source rocks of Santanghu Basin

By using the method of organic petrology on whole rock surfaces and combing with the data of organic geochemistry,this paper was carried out a detailed study on thermal evolution of organic matter in Jurassic coal-bearing source rocks of Santanghu Basin.There were both general character and special feature of thermal evolution of Jurassic coal-bearing source rocks in Santanghu Basin. The former generally demonstrates that the vitrinite reflectance(R), the fluorescence parameters( i. e. max, Q. I546 ) of sporinite and the molecular geochemical indexs ( such as C31 ho-pane 22S/(22S + 22R)) of soluble organic matter are of important significances in indicating the level of thermal evolution in Santanghu Basin. The latter is mainly reflected in several aspects,such as no obvious correlation between the indicators of thermal evolution and the present burial depth, the similar degree of thermal evolution in the same member, the differential evolution of different organic macerals and the obvious stage properties of thermal evolution of organic matter. Based on these suggestions and authors' previous results,a model of oil generation from Jurassic coal-bearing source rocks of Santanghu Basin is preliminary established.