二连盆地东缘林西地区上二叠统林西组烃源岩特征研究

Research on Feature of Source Rocks of Linxi Formation in Upper Permian Linxi Region in Eastern Erlian Basin

二连盆地东缘林西地区上二叠统林西组发育巨厚层暗色泥岩,分布广泛,具有较好的油气资源潜力。以林西地区四条野外剖面的样品为研究对象,采用有机岩石学与有机地球化学的方法,基于有机显微组分、有机质丰度、类型及成熟度指标进行烃源岩评价。结果表明,上二叠统林西组烃源岩有机质丰度较高,有机质类型为Ⅱ型,偏Ⅱ2型,有机质热演化程度处于高-过成熟阶段,属于中等-好烃源岩,且生烃以产气为主,产油为辅。

The Linxi Formation of Upper Permian of Linxi area in the eastern margin of the Erlian basin, develop huge thick layer of dark shale, which is widely distributed and has good potential for oil and gas resources. Four field sections’ samples in Linxi area as the research object, by the methods of organic petrology and organic geochemistry, evaluate of source rocks base on organic maceral, organic matter abundance, type and maturity. Results indicate that the source rocks of Linxi Formation of Upper Permian has high abundance of organic matter, organic matter type is type Ⅱ, partial type Ⅱ2, degree of thermal evolution of organic matter is high mature and over mature, belongs to the middle-good source rocks, has the strong ability of hydrocarbon generation, and it gives priority to with producing gas, oil is complementary.