Geochemical features of oil-bearing samples from the well in Buqu Formation in the Qiangtang Basin, northern Tibet, and their implications

WANG Zhongwei; WANG Jian; FU Xiugen; CHEN Wenbin; WEI Hongwei; SONG Chunyan

2017 Vol. 36, No. 4

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WANG Zhongwei, WANG Jian, FU Xiugen, CHEN Wenbin, WEI Hongwei, SONG Chunyan. Geochemical features of oil-bearing samples from the well in Buqu Formation in the Qiangtang Basin, northern Tibet, and their implications[J]. Geological Bulletin of China, 2017, 36(4): 591-600.

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WANG Zhongwei, WANG Jian, FU Xiugen, CHEN Wenbin, WEI Hongwei, SONG Chunyan. Geochemical features of oil-bearing samples from the well in Buqu Formation in the Qiangtang Basin, northern Tibet, and their implications[J]. Geological Bulletin of China, 2017, 36(4): 591-600.

Geochemical features of oil-bearing samples from the well in Buqu Formation in the Qiangtang Basin, northern Tibet, and their implications

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China
2.
Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Sedimentary Geology Research, Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China

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Corresponding author: FU Xiugen, fuxiugen@126.com

Received Date: 18 October 2016

Revised Date: 15 March 2017

Publish Date: 25 April 2017

Abstract

Abstract

The Qiangzi-11 and 12 wells are the data well to reveal the distribution regularities of Longeni-Angdaerco palaeo-oil reservoirs. Together with the hydrocarbon source rock data of Buqu Formation, Xiali Formation, and Quse Formation from Qiangzi-2 well, the authors analyzed the oil-rock correlations based on the biomarker parameters composed of isoprenoid, steranes, and ter-panes. The property of crude oil from Qiangzi-11 and 12 wells is of the same type. However, the biodegradation degree from Qiang-zi-11 well is higher than that from Qiangzi-12. The biomarker parameters reveal that the organic matter mainly originated from al-gae. The crude oil was formed under weak reduction-reduction conditions and in a slightly salty water environment. The biomarkers of crude oil, composed of isoprenoid, terpane, and sterane, are closely related to those of the Buqu Formation in Qiangzi-2 well, and also show good correlation with those of the Xiali Formation and Quse Formation in Qiangzi-2 well. Combined with the TOC data of the hydrocarbon source rock in south Qiangtang Basin, the authors hold that the crude oil of the Longeni-Angdaerco palaeo-oil reservoir was mainly from the source rocks of Quse Formation, and partly from the Xiali and Buqu Formations, suggesting a mixture of sources. The result of this study may have some guidance significance for further oil-gas exploration.
- biomarker /
- oil-bearing dolomite /
- Buqu Formation /
- oil-rock correlation /
- Qiangtang Basin

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References

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