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Geology and geochemistry of bitumen vein deposits at Ghost City, Junggar Basin, northwest China

Published online by Cambridge University Press:  01 May 2009

John Parnell ,
Geng Ansong ,
Fu Jiamo  and
Sheng Guoying
John Parnell
Affiliation:
Department of Geology, The Queen's University of Belfast, Belfast BT7 INN, UK
Geng Ansong
Affiliation:
Department of Geology, The Queen's University of Belfast, Belfast BT7 INN, UK
Fu Jiamo
Affiliation:
Guangzhou Branch, Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Wushan, Guangzhou 510640, P.R., China
Sheng Guoying
Affiliation:
Guangzhou Branch, Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Wushan, Guangzhou 510640, P.R., China
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Abstract

Veins of solid bitumen occur in Cretaceous sandstones at the northwest margin of the Junggar Basin, China. The bitumen has a low aromaticity and a composition comparable to gilsonite. The bitumen contains abundant steranes and terpanes, and β-carotane, although most n- and i- alkanes have been removed, which is characteristic of the local crude oil. The sterane and triterpane maturity parameters show that the bitumen, local crude oil, and source rocks are all mature. Bitumen–wallrock relationships suggest that the host sandstone was not completely consolidated at the time of emplacement of the bitumen veins, although bitumen emplacement was a relatively late diagenetic event. The burial history for the northwest Junggar Basin shows that hydrocarbon generation from the assumed upper Permian source rocks commenced in late Triassic/early Jurassic times and suggests that rapid hydrocarbon generation may have resulted in overpressure contributing to the bitumen emplacement.

Type
Articles
Information
Geological Magazine , Volume 131 , Issue 2 , March 1994 , pp. 181 - 190
Copyright
Copyright © Cambridge University Press 1994

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