干酪根热解聚沥青中的脂烃生物标记物

将干酪根在超临界态溶剂存在下进行热解聚,抽出物中的脂烃生物标记物的分析表明,抚顺与茂名油页岩干酪根中有相当多的陆源高等植物参与生成。甾烧萜烷的成熟度参数表明,热解聚沥青的成熟度很低。对于干酪根通过热解聚形成未熟或低熟原油的可能性作了初步探讨。

ALIPHATIC BIOMARKERS FROM BITUMEN OF THERMAL DEPOLYMERIZED KEROGEN

The similarity of chemical structural parameters between the kerogen and the bitumen extracted by supercritical state toluene or water leads to the conclusion that the bitumen is a thermal depolymerization product of kerogen. GC/MS analysis of the aliphatic elute of the thermal bitumen has confirmed the existence of various n-alkanes, isoprenoids, steranes and ter-panes. The major peak of the alkanes(C27), the high ratio of terpanes content to steranes(up to 10) and the existence of the gammacerane indicate that the terrestrial plants had played an important role in the genesis of the Fushun and Maoming kerogen. The predominance of the odd/even ratio of the alkanes and the low ratio of biomarker parameters show that these thermal bitumens are immature in nature. It is comparable to the parameters of immature oil of Shengli Oilfield and implies that the thermal depolymerization of kerogen is probably one of important path for the immature oil formation.