Investigation on the composition of the extraheavy oil in Liaohe oilfield and the cause of its high viscosity

被引：0
作者：
Wang S. [1 ]
Shen B. [1 ]
Lin R. [2 ]
机构：
[1] National Research Center for Geoanalysis
[2] Department of Natural Resource and Environmental Science, China University of Petroleum
来源：
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | 2010年 / 26卷 / 06期
关键词：
Chemical composition; Extra heavy oil; Geochemistry; Viscosity;
D O I：
10.3969/j.issn.1001-8719.2010.06.011
中图分类号：
学科分类号：
摘要：
Based on a systematic analysis of the chemical composition of two extraheavy oils from Liaohe oilfield, China, together with investigations on the influence of class, polarity and molecular mass of components to the viscosity, chemical character and causes of the high viscosity of the oil were discussed. The results showed that the heavy oils contained mainly polar hetero-components and high molecular mass components due to that their organic matter was low mature and had suffered from extreme biodegradation. The content of resin and asphaltene in the oil was as high as 70% together and reached 40% for asphaltene fraction alone, which was much higher than that in heavy oils from other oil reservoirs of China, while the content of GC amenable components was very low, which was accounted less than 22% of the aliphatic and aromatic hydrocarbon fractions, and less than 15% and 1% of the acidic and neutral hetero-component fraction respectively. Only trace acyclic alkanes were detected by GC-MS in the aliphatic hydrocarbon fractions, while compound serials of pregnanes, diasteranes and norhopanes dominated. It was concluded that low maturity and microbial, chemical, as well as physical alteration of the composition of the oil were the main petrogeochemical conditions for the formation of extraheavy oils, and the extremely high content of high molecular mass components and hetero-components in the oil was the chemical basis of its high viscosity.
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页码：894 / 900
页数：6
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