Biological marks of the crude oil contain long lateral chain of tricyclic terpane, and the content of gammacerane is low.

原油志化合分布,见长侧链三环萜烷,但γ-蜡烷丰度较低。

Relative higher concentration of gammacerane in Songliao fresh-brackish lacustrine environment is connected with water column stratification caused by event of linking between lacustrine and sea.

松辽地淡水-微咸水环境较高含量的伽马蜡烷表明其形成与通引起的水体分层事件有关。