三塘湖盆地的煤系主要发育于侏罗系西山窑组和八道湾组。４ 口井３０ 余块样品测试结果表明，煤系有机质丰度及可抽提有机质的量都较高；正构烷烃具明显奇偶优势；姥植比为１－２５～８－１７；正规甾烷内组成分布具明显Ｃ２９ 优势，Ｃ３１ 藿烷含量高，伽马蜡烷含量低；干酪根碳同位素为－ ２－２７９ 和－ ２－４１３ ；镜质体反射率为０－５０～０－６２ ，正处于主要生烃期；但其地球化学特征明显异于侏罗系、二叠系含油岩芯抽提物，表明侏罗系煤系生成的烃类并未从煤系中排出，对本区油气聚集没有贡献。所以在研究煤成烃时，更应注意研究煤成烃的排出条件 The coal measures in the Santanghu Basin mainly develop in the Xishayao Formation and Badaowan Formation of the Jurassic. The test results of more than 30 samples from 4 wells showed that the abundance of organic matter and the amount of extractable organic matter in coal series are relatively high. The n-alkanes have obvious even and odd advantages; the ratio of basal planting is 1-25-8-17; The inner composition distribution is obviously C29, the content of C31 hopane is high, the content of gamma-wax is low, the kerogen carbon isotopes are - 2-279 - and -2-413 , and the vitrinite reflectance is 0-50   ~ 0-62 , is in the main period of hydrocarbon generation; however, its geochemical characteristics are significantly different from those of Jurassic and Permian oil core cores, indicating that hydrocarbons from the Jurassic coal series did not migrate from Coal system in the discharge, the region did not contribute to the accumulation of oil and gas. Therefore, when studying coal hydrocarbon generation, more attention should be paid to the study of coal hydrocarbon production conditions