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

原油生物标志化合物分布,见长环萜烷,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蜡烷表明其形成与湖海沟通引起水体分层事件有关。