Geochemical characteristics of carbon and hydrogen isotopes of light crude oils from the deep reservoirs in the Tazhong area of Tarim Basin, NW China

Haizu ZhangResearch Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang, China; View further author information

Jianbing XuState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; ;State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, China; View further author information

Ke ZhangResearch Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang, China; View further author information

Zhiwei WeiState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; ;University of Chinese Academy of Sciences, Beijing, ChinaView further author information

Qing ZhaoResearch Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang, China; View further author information

Oluwabamise L. FaboyaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; View further author information

Bin ChengState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; Correspondence[email protected]
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Abstract

The stable carbon and hydrogen isotopes of light crude oils from deep reservoirs of Cambrian-Ordovician strata in Tazhong area of Tarim Basin, NW China were investigated. The δ¹³C and δD values determined from the oil samples ranged from −32.94 to −29.53‰ and −121.36 to −87.78‰, respectively. A positive correlation exists between δ¹³C_oil and δD_oil when the δ¹³C_oil < −31.15‰, while a negative correlation occurs at δ¹³C_oil > −31.15‰. This basic geochemical data is quite instructive in that the δ¹³C_oil value of approximately −31‰ may be an important threshold value to delimit the origin of the organic matter that formed the light crude oils.

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This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA14010103) and the National Oil and Gas Project of China (2017ZX05008002).

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Geochemical characteristics of carbon and hydrogen isotopes of light crude oils from the deep reservoirs in the Tazhong area of Tarim Basin, NW China

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Geochemical characteristics of carbon and hydrogen isotopes of light crude oils from the deep reservoirs in the Tazhong area of Tarim Basin, NW China

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