Study on Stable Carbon Isotopic Compositions of n-alkanes and Isoprenoids for Crude Oils from Well Lunnan 14, Tarim Basin

LU Hong; CHAI Ping-xia; SUN Yong-ge; PENG Ping-an

Compound-specific stable carbon isotope analysis of n-alkanes and isoprenoids were conductedf or crude oils from Well Lunnan 14, Lunnan oilfield, tarim basin, NW China. it can be seen that the crude oils from the 0rdovician and Carboniferous productive horizons shared the same organic matter inputs while the triassic crude oil had different sources of organic matter input. in addition,the carbon isotope composition of isoprenoi dsis isotopically heavier than that of n-alkanes with the same carbon number. it is presumed that the biosynthesis pathway and intramolecular distribution of ¹³C might theoretically account for the recognized relationship between n-alkanes and isoprenoids in terms of carbon isotope compositions.

State Key Laboratory of Organic Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,510640

Received Date: 2001-07-03

Rev Recd Date: 2001-10-17

Key words:

Well Lunnan 14 /
n-alkanes /
isoprenoids /
compound-specific stable carbon isotope compositions

Abstract: Compound-specific stable carbon isotope analysis of n-alkanes and isoprenoids were conductedf or crude oils from Well Lunnan 14, Lunnan oilfield, tarim basin, NW China. it can be seen that the crude oils from the 0rdovician and Carboniferous productive horizons shared the same organic matter inputs while the triassic crude oil had different sources of organic matter input. in addition,the carbon isotope composition of isoprenoi dsis isotopically heavier than that of n-alkanes with the same carbon number. it is presumed that the biosynthesis pathway and intramolecular distribution of ¹³C might theoretically account for the recognized relationship between n-alkanes and isoprenoids in terms of carbon isotope compositions.

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Reference (15)

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Study on Stable Carbon Isotopic Compositions of n-alkanes and Isoprenoids for Crude Oils from Well Lunnan 14, Tarim Basin

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