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塔西南地区是塔里木盆地石油勘探的后备区,整体考虑区域内已发现轻质原油的轻烃地球化学特征,对确定区域内原油成因类型和成藏过程具有重要意义。利用配置PONA毛细管柱的GC对区域内22件原油进行C6—C13轻烃族组成、族组分比值、MCyC6/nC7和m-xylene/(m-xylene+nC8+nC9)分析。结果表明,塔西南地区原油可划分为巴什托轻质油族群、和田河轻质油族群和柯克亚轻质油族群3个族群。族群划分结果显示原油存在3套烃源岩,部分原油存在混源特征,轻烃结果受原油芳烃和碳同位素分析支持。
The southwestern Tarim Basin is a reserved area for oil exploration in the Tarim Basin. Considering the geochemical characteristics of light hydrocarbons of light crude oil in the area as a whole, it is of great significance to determine the type and accumulation of crude oil in the area. C6 crude oils were analyzed for C6-C13 light hydrocarbon family composition, MCyC6 / nC7 and m-xylene / (nC8 + nC9) using GC equipped with PONA capillary column. The results show that the crude oil in southwestern Tarim Basin can be divided into three groups: Bassto light oil group, Hetian light oil group and Kekeya light oil group. Ethnic grouping results show that there are three sets of source rocks in the crude oil, and some of the crude oils have mixed source features. The light hydrocarbon results are supported by the analysis of aromatics and carbon isotopes of crude oil.