东营凹陷北部陡坡带稠油成藏机理与油气运聚特征

李素梅; 庞雄奇; 邱桂强; 高永进; 孙锡年

Volume 29 Issue 4

Jul. 2004

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Article Navigation > Earth Science > 2004 > 29(4): 451-456

LI Su-mei, PANG Xiong-qi, QIU Gui-qiang, GAO Yong-jin, SUN Xi-nian, 2004. Oil Migration and Accumulation Mechanisms for Heavy Oils in North Steep Slope of Dongying Depression, Eastern China. Earth Science, 29(4): 451-456.

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Oil Migration and Accumulation Mechanisms for Heavy Oils in North Steep Slope of Dongying Depression, Eastern China

1.
Key Laboratory for Hydrocarbon Accumulation Mechanism, University of Petroleum, Ministry of Education, Beijing 102249, China
2.
Basin and Reservoir Research Center, University of Petroleum, Beijing 102249, China
3.
Shengli Oilfield Company Limited, SINOPEC, Dongying 257015, China

Received Date: 2004-03-12
Publish Date: 2004-07-25

Abstract

Abstract

A large amount of heavy oils are discovered in the north steep slope (NSS) of the Dongying depression, the Bohai Bay basin, Eastern China, but the mechanism of oil accumulation for this oil pools is still not well understood. Based on detail investigation of the composition for the oils and their source rocks, pyrrolic nitrocompounds and fluid inclusions have been analyzed to trace the process of oil migration and accumulation in the Wangzhuang-Ninghai region. The results show that apparent migration effects of nitrogen compounds within the oils from south to north, indicate the oils in the north steep slope originated mainly from the Lijing sag in the Dongying depression. Obviously, migration effects from east to west observed in the Wangzhuang-Ninghai area indicate two main charging points respectively in the eastern and western areas. Composition of alkanes and non-alkanes and their distribution as well as pyrrolic nitrogen compounds show the origin of mixing of the oils. Alkanes with slight and/or no biodegradation and 25-norhopanes with strong biodegradation are observed in same oils, which indicates possibly multiple oil charging periods and/or redistribution of the oils due to tectonic movement. Two periods of oil formation and accumulation have been identified as evidenced from fluid inclusions. Oil pools in the Wangzhuang-Ninghai region were formed within 5 (?) Ma before present. The oils generated in nearly 36 (?) Ma ago as evidenced from inclusions in reservoir near the Lijing sag. A number of faults, several unconformities and a series of well developed fans with coarse sands and conglomerate in the NSS are taken as favored migration pathways for hydrocarbon in the study (area).
- heavy oil,
- nitrogen compounds,
- fluid inclusion,
- oil migration,
- north steep slope

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References

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Oil Migration and Accumulation Mechanisms for Heavy Oils in North Steep Slope of Dongying Depression, Eastern China

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