对三江盆地前进坳陷西大林子凹陷古近系烃源岩进行了系统的评价,并与依舒地堑古近系烃源岩进行了比较.结果表明,西大林子凹陷古近系泥岩发育,其中宝泉岭组泥岩最为发育;泥岩的有机质丰度从宝泉岭组二段—宝泉岭组一段—达连河组逐渐增大,有机质类型也有逐渐变好的趋势,但有机质热演化程度普遍较低,处于未成熟—低成熟热演化阶段;达连河组和宝泉岭组一段下部的泥质岩是西大林子凹陷的有效烃源岩.西大林子凹陷应具有一定的勘探前景.%The Palaeogene source rocks from the Xidahnzi Sag of the Qianjin Depression of the Sanjiang Basin were evaluated systematically and were compared with those from the Yishu Graben. In the Xidalinzi Sag, mud-stones developed well in Palaeogene, especially in the Baoquanling Formation. From the 2nd member of the Bao-quanling Formation to the Dalianhe Formation, the organic abundance of mudstones increased and the organic type gradually improved; however, the maturity of organic matters was lower, generally during the immature and low mature stages. The mudstones in the Dalianhe Formation and the lower part of the 1 st member of the Baoquanling Formation served as the effective source rocks for the Xidalinzi Sag which has good exploration prospect.
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