Geochemical characteristics of Ordovician crude oils in the northwest of the Tahe oil field,Tarim basin |
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Authors: | Qiuhua Yu Zhigang Wen Youjun Tang |
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Institution: | YU Qiuhua1,2,3, WEN Zhigang2,3, and TANG Youjun2,3 1 Basin & Reservoir Research Center, China University of Petroleum, Beijing 102249, China 2 Key Laboratory of Exploration Technologies for Oil and Gas Resources; Ministry of Education; Jingzhou 434023, China 3 Department of Geochemistry, University of Yangtze, Jingzhou 434023, China |
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Abstract: | Forty-six crude oil samples were selected from the Ordovician in the northwestern part of the Tahe oilfield for detailed molecular
geochemical and isotopic analysis, including group compositions, carbon-hydrogen isotopes and gas chromatograms of saturated
hydrocarbons, as well as the characteristics of terpane, sterane and other biomarkers, indicating that crude oils are of the
same origin from different districts in the Tahe oilfield and were derived from the same source kitchen (or oil source formation),
i.e., mainly stemming from marine hydrocarbons. Detailed studies of oil physical properties of 25-honpane revealed that such
oils have heavy or thick oil qualities due to biodegradation. Comprehensive assessment in terms of five maturity parameters
shows that the oils from the Ordovician with R
∘ values varying from 0.80% to 1.59% are widely distributed in the northwest of the Tahe oilfield. |
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Keywords: | Tahe oilfield Ordovician biomarker heavy oil maturity biodegradation |
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