歧口凹陷未熟-低熟烃源岩生烃组分研究

EVOLUTION OF ORGANIC MATTER OF IMMATURE SOURCE ROCK IN QIKOU SAG

有机岩石学全岩分析结果表明,歧口凹陷未熟-低熟烃源岩中显微组分含量平均占全岩体积的4.64%,矿物沥青基质含量相对偏低。显微组分中富含腐泥组,惰质组含量很低,相对发育壳质组和镜质组,具有藻类等低等水生生物与高等植物混合生源的特点。藻类体是歧口凹陷主要的生烃组分,矿物沥青基质是歧口凹陷烃源岩中值得重视的生烃组分。

Whole-rock analysis of organic petrology indicates that the average maceral content of immature source rocks in the Qikou sag makes up 4.64% of the whole rock volume and the min- eral-bituminous groundmass content is relatively low. The maceral is rich in sapropel but lack of inertinit, and relatively rich int exinite and vitrinite, showing characteristics of mixture of hydrobi- ological macerals and terrestrial macerals. It is considered that the alginite is the main hydrocar- bon-generating maceral for immature source rocks and mineral-bituminous groundmass is another hydrocarbon generation components for immature source rocks in the Qikou sag.