Geochemical analysis data (organic carbon, chloroform bitumen "A", kerogen maceral, isotope, vitrinite reflectance, etc. ) are employed to evaluate the potential of hydrocarbon generation by organic matter abundance, type and thermal maturity for the Es3 dark mudstone in the Tangyi subsag of Shenxian sag. The result indicates that dark mudstone had developed in this subsag; the abundance of organic matter is high in the lower member of Es3 source rocks, belonging to medium - good source rock, showing characteristics of hybrid parent materials of terrigenous deposit and Type Ⅱ 2 — Ⅱ 1 kerogen; holistic approach indicates that the source rock started to generate hydrocarbon from 2 950 m and reached generation peak from 4 000 m downward.%以莘县凹陷堂邑洼陷钻井暗色泥岩为研究对象,利用有机碳、生烃潜量和氯仿沥青“A”含量、干酪根显微组分、同位素组成和镜质体反射率等分析化验资料,采用有机质丰度、类型和成熟度指标,对烃源岩的生烃潜力进行了评价.结果表明:该洼陷暗色泥岩发育,沙三段下段烃源岩有机质丰度较高,为中等—好烃源岩,具有陆源沉积混合母质的特征,表现为Ⅱ2-Ⅱ1型干酪根；综合分析烃源岩大约在2 950 m开始生烃,埋藏深度4 000 m以上达到生烃高峰此研究可为该区下一步勘探和井位部署提供参考.
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