Geochemical characteristics and significance of Early Cretaceous bitumens in Esima area, southern Qiangtang Basin of Tibet

CHEN Wenbin; ZHAN Wangzhong; FU Xiugen; ZENG Shengqiang; HE Yongzhong

2017 Vol. 36, No. 4

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CHEN Wenbin, ZHAN Wangzhong, FU Xiugen, ZENG Shengqiang, HE Yongzhong. Geochemical characteristics and significance of Early Cretaceous bitumens in Esima area, southern Qiangtang Basin of Tibet[J]. Geological Bulletin of China, 2017, 36(4): 624-633.

Citation:

CHEN Wenbin, ZHAN Wangzhong, FU Xiugen, ZENG Shengqiang, HE Yongzhong. Geochemical characteristics and significance of Early Cretaceous bitumens in Esima area, southern Qiangtang Basin of Tibet[J]. Geological Bulletin of China, 2017, 36(4): 624-633.

Geochemical characteristics and significance of Early Cretaceous bitumens in Esima area, southern Qiangtang Basin of Tibet

1.
Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China
2.
Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Land Resources, Chengdu 610081, Sichuan, China
3.
Guizhou Geological Survey, Guiyang 550005, Guizhou, China

Received Date: 18 October 2016

Revised Date: 16 March 2017

Publish Date: 25 April 2017

Abstract

Abstract

Early Cretaceous bitumens were found for the first time in Esima area in southern Qiangtang Basin. The authors analyzed the organic geochemical characteristics from the bitumen content of organic carbon and group composition and biomarkers in this area and discussed the oil-source correlation. The result reveals that the total organic carbon content of the bituments samples varies in the range of 3.42%~75.01%, indicating abundant bitumens. The bitumen samples have the highest fraction of heavy hydrocarbons (nonhydrocarbon and asphaltene), followed by aromatics hydrocarbon, and the lowest fraction is saturated hydrocarbon. The maturity of bitumens are not in high maturity and are mainly in the mature stage. The source rock was deposited under reductive conditions, and the original organic matter was algae and high-grade plants, with especially important contribution made by algae. Oil-source correlations were studied by using the biomarkers, and the results show that the bitumens were derived from the Suowa Formation mudstones. The results obtained by the authors are important for oil and gas exploration in southern Qiangtang Basin.
- biomarkers /
- oil-source correlation /
- Early Cretaceous /
- Qiangtang Basin

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References

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