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通过对黄珏地区原油样品系统的全油色谱和色谱-质谱分析,剖析了该地区原油的地球化学特征。对原油的组成特征、成熟度、母质来源等方面进行了探讨。研究后发现,黄珏地区所产原油在正构烷烃分布上没有明显的碳数优势,植烷含量较高。在原油成熟度方面,C29甾烷异构体比值与类异戊二烯烷烃所表现出的成熟度特征一致,显示出成熟原油的特征。在原油母质类型方面,三段储层原油的甾烷分布指纹基本一致,均为C29甾烷>C27甾烷>C28甾烷的V字型分布,且不同碳数的甾烷分布范围较窄,说明黄珏油田原油具有相似的成油母质,它们为藻类、浮游植物和陆生植物,并且陆生植物对原油的形成具有重要贡献。
The geochemical characteristics of the crude oil in the area were analyzed through the whole oil chromatography and mass spectrometry analysis of the crude oil sample system in Huangjue region. The composition of crude oil, maturity, sources of parent material and other aspects were discussed. After the study, it was found that the crude oil produced in the Huangjue region has no obvious carbon number advantage in the distribution of normal paraffins and higher phytane content. In terms of crude oil maturity, the C29 sterane isomer ratio is consistent with the maturity characteristics exhibited by the isoprenoid, indicating the character of the mature crude oil. In terms of crude parent material types, the fingerprints of the steranes in the three reservoirs are basically the same, all of them are V-shaped distributions of C29 steranes> C27 steranes> C28 steranes, and the narrower ranges of steranes have different carbon numbers. It shows that the crude oil of Huangjue Oilfield has similar oil-forming precursors, which are algae, phytoplankton and terrestrial plants, and terrestrial plants have an important contribution to the formation of crude oil.