A Discussion on Petroleum Migration in the Wunan Oilfield of&nbsp; Qaidam Basin Based on Nitrogen Compounds

ZHANG Ming-Feng, TUO  Jin-Cai, GUO  Li-Jun, CHEN  Ru, LI  Zhong-Ping, LIU  Li

doi:10.11764/j.issn.1672-1926.2010.05.727

Natural Gas Geoscience >

2010 , Vol. 21 >Issue 5: 727 - 731

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.05.727

A Discussion on Petroleum Migration in the Wunan Oilfield of Qaidam Basin Based on Nitrogen Compounds

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1. Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics，Chinese Academy of Sciences, Lanzhou 730000，China；2. Research Institute of Petroleum Exploration and Development,Qinghai Petroleum Administration,Dunhuang 736202，China；3. Environmental Science Design and Research Institute of Gansu Province, Lanzhou 730000，China

Received date: 2009-02-18

Revised date: 2010-03-01

Online published: 2010-10-10

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Abstract

Nitrogen compounds are a kind of non-hydrocarbon fraction, and could be used as effective tracers in oil migration and as parameters in evaluating the quantity of migrated oil. Using the nitrogen compounds in the crude oil composition and relative abundance of change, combined with hydrocarbon biomarker analysis of the characteristics of crude oil, the authors discuss on petroleum migration in the Wunan oilfield of Qaidam basin. The results indicate that the type of Wunan crude oil is more consistent from the same source. Significant oil-migration effects of nitrogen compounds in the oils are observed. With the strengthening of the role of migration, the concentration of nitrogen compounds is decreased. It seems that migration effect among pseudo-homolog of carbazoles and benzocarbazoles is more apparent than that among nitrogen marked，partially marked and exposed isomers. The results also show Wunan crude oil may be generated on its adjacent westside depression. The oils are likely to migrate from west to north and from northwest to southeast.

Key words： Wunan oilfield; Biomarker; Nitrogen compounds; Oil migration.

Cite this article

ZHANG Ming-Feng, TUO Jin-Cai, GUO Li-Jun, CHEN Ru, LI Zhong-Ping, LIU Li . A Discussion on Petroleum Migration in the Wunan Oilfield of Qaidam Basin Based on Nitrogen Compounds[J]. Natural Gas Geoscience, 2010 , 21(5) : 727 -731 . DOI: 10.11764/j.issn.1672-1926.2010.05.727

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