济阳坳陷奥陶系烃源岩生物标志物地球化学特征

利用生物标志物分析技术，结合其他地球化学资料探讨了济阳坳陷不同地区奥陶系烃源岩有机质的生物来源、成熟度和沉积环境。结果表明，早古生代藻类浮游植物的大量繁盛和细菌微生物强烈活动的产物是济阳坳陷奥陶系烃源岩有机．质生物来源构成的物质基础。烃源岩有机质丰度较低，有机质类型以Ⅰ型干酪根为主。烃源岩抽提物中Pr／Ph值均小于1，表明沉积环境较还原。等效镜质组反射率及芳烃成熟度参数显示济阳坳陷奥陶系烃源岩大多达到高成熟阶段。部分达到成熟、过成熟阶段。

Geochemical characteristics of biomarker of Ordovician source rocks in Jiyang Depression

The biogenetic derivation of organic material, its maturity and depositional environment of Ordovician source rocks in different regions of Jiyang Depression were discussed, based on the analytic technique of biomarkers, combined with the other geochemical data. The result showed that the organic materials of source rock were derived from the blooming phytoplankton and the products of frequent bacteria activities in Eopaleozoic. The abundance of the organic material of source rock is low, and the type of organic materials took type I kerogen as the dominant factor. Pr/Ph value in the extract of source rock is less than 1, which indicated that it was deoxidizing environment. The equivalent vitrinite reflectance and aromatic maturity parameters showed that most Ordovician source rocks were highly mature,and some of them were mature or over mature.