We can see that es3 and es4 source rocks contributes greatly to the formation of immature oil . other oil source correlation also show that the immature oil originated from source rocks of es3 and es4 in this region . 7 ) the existence of high abundance of sulfid in the mudstone indicate that that there is a relatively high salinity environment in source rocks which is favorable for algae growth 4 、通过稳定碳同位素、甾烷和萜烷等不同的生物标志化合物参数分析探讨了研究区德1井低熟油的物源，生物标志化合物图谱指纹对比表明，德1井沙一段( es _ 1 )油来源于本段烃源岩，德1井沙四段( es _ 4 )原油主要来源于沙四段泥岩和沙三段中、下部泥岩，为自生自储成因。
