Ruthenium ion catalytic oxidation of asphaltenes further verifies that the source rocks in Middle and Upper Ordovician are the main source rocks of heavy oil in Lunnan and Tahe oilfields.

• 轮南、塔河稠油沥青质钌离子氧化降解产物在一元酸及甾烷酸、4 甲基甾烷酸的分布与TD2井稠油明显不同 ,进一步证明中、上奥陶统烃源岩可能为轮南、塔河稠油的主力源岩。