收稿日期: 2007-10-23
修回日期: 2008-01-06
网络出版日期: 2008-02-10
基金资助
国家自然科学基金项目（编号：40573030）资助.
Compositions and Geochemical Characteristics of Light Hydrocarbonsin Typical Marine Oils and Typical Coal Formed Oils
Received date: 2007-10-23
Revised date: 2008-01-06
Online published: 2008-02-10
王祥,张敏,黄光辉 . 典型海相油和典型煤成油轻烃组成特征及地球化学意义[J]. 天然气地球科学, 2008 , 19(1) : 18 -22 . DOI: 10.11764/j.issn.1672-1926.2008.01.18
Based on the results of earlier studies on light hydrocarbons by several researchers, typical marine oils from the Tazhong area in the Tarim basin and typical coal-formed oils from the Turpan basin were selected and analyzed to find the differences of compositional characteristics of light hydrocarbons between the two oil categories and to provide new geochemical cognition for classifying the origin of oils. Through the GC-MS analytic technology, the light hydrocarbons data for two kinds of oils were obtained. (1) Light hydrocarbons of marine oils in the Tazhong area are rich in nC7, and the coal- formed oils from the Turpan basin are rich in MCyC6.(2) The Mango parameter K1 ranges from 0.97 to 1.19 in the marine oils, and it is consistent with the conclusion that Mango reported on light hydrocarbons based on a majority of crude oils data. But the K1 values of the coal-formed oils are particularly high (1.35～1.66) and far greater than marine oils. (3) Heptane values in the marine oils, from 32.3% to 45.4%, and isoheptane values, from 1.9 to 3.7, are respectively higher than the coal\|formed oils, which indicates that it is in a highly mature stage. (4) The expulsion temperatures for the coal-formed oils (96.8～102.2℃) are relatively lower than the marine oils (115.3～129.4℃).
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