江汉盆地下第三系烃源岩生烃组分剖析

有机岩石学全岩分析结果表明，江汉盆地盐湖相烃源岩显微组分含量明显偏低，平均仅占全岩体积的１．５％。显微组分组成中富含腐泥组、贫惰性组、相对发育镜质组和壳质组，具有藻类低等生物与高等植物混合生源的特点。藻类体是江汉盆地低熟油的主要生烃组分，隐含于矿物沥青基质中的有机质约占总有机质的一半以上，是江汉盆地值得重视的生烃组分

Hydrocarbon-generation Macerals of Paleogene Source Rocks in Jianghan Basin

Jianghan basin is famous for lowmature oils under saline environmentFullscale analysis of organic petrology on the samples of Paleogene source rocks shows that the oils are believed to be from Qianjiang formation and Xingouzui formation The maceral content of both formations ranges from 04% to 83% by volume, averaging at 15% It is obviously lower than that of Paleogene in other basins of east ChinaTheir macerals are rich in sapropelinite,relatively rich in vitrinite and exinite , lack of inertinite, with mixture inputs of lower aquatic algae and terrestrial higher plants Alginite is a main hydrocarbongeneration maceral for lowmature oil in this basin The quantity of organic matters hidden in mineralbituminite groundmass is more than a half of the total organic matter and, consequently, deserves extra attention