中文摘要：

准噶尔盆地腹部地区原油普遍混源,为确定混源油的油源组成,本文尝试选取代表不同端元的单一油源原油的样品,进行人工配比混合模拟实验,发现原油饱和烃馏分C20-C21-C23三环萜烷的峰形会随不同油源原油的混合比例而有规律地变化.据此,以本区邻近盆1井西生烃凹陷的莫索湾和莫北油田为例,研究了混源油的聚集特征,结果表明,在近生烃凹陷区,晚期生成的下乌尔禾组生源油所占比例较高,而在远生烃凹陷地区,早期生成的风城组生源油所占比例较高,后期下乌尔禾组原油对前期风城组原油的“推动”作用以及发生在“推动”过程中的混源效应和次生变化,是准噶尔盆地腹部地区原油聚集过程中的重要特征.

英文摘要：

Oils in central Junggar Basin are usually mixed by two sets of source sequences,i.e.Lower Permian Fengcheng and Middle Permian Lower Wuerhe formations.In order to quantify source composition of the mixed Permian oils,we carried out artificial oil mixing experiments in this paper.The analytical results show that the distribution pattern of C20-C21-C23 tricyclic terpanes varies along with oil-mixing ratio accordingly.Based on this,we studied the accumulation characteristics of mixed oils in a case study in Mosuowan-Mobei area near the West Well Pen 1 sag.It is indicated that in the area near the hydrocarbon sag,petroleum sourced from Lower Wuerhe Formation have a higher proportion than the oils from Fengcheng Formation,but this trend is on the contrary in the area far from the hydrocarbon kitchen.This implies that the later arriving Lower Wuerhe oils impulsed the earlier expulsed Fengcheng Formation oils.During this process,oils mixed commonly and some secondary alteration happened.This is a typical characteristic of petroleum migration in central Junggar Basin.