Hydrogen isotopic compositions, distributions and source signals of individual n-alkanes for some typical crude oils in

Isotopic compositions of carbon-bound hydrogen in individual n-alkanes from several typical crude oil samples from Lunnan Oilfield, Tarim Basin, NW China, were firstly measured using newly developed gas chromatography-thermal conversion-isotope ratio mass spectrometry. The similar range of δD of individual n-alkanes of crude oils among reservoirs of different geological times reflects that hydrocarbons are all derived from the same marine depositional environment. Compared to the theoretic value (-150‰) and the reported δD values (nC13―nC27, -160‰―-90‰) of individual n-alkanes for Ordovician-sourced crude oils in the Canadian Williston Basin, the hydrogen isotopic composition of individual n-alkanes in crude oils from Lunnan Oilfield is characterized by heavy hydrogen isotopic values (nC12―nC27, -120‰―-60‰). In terms of the factors that control the fractionation of hydrogen isotopes, relatively saline depositional environment and higher thermal maturation were attributed to the heavy δD values of individual n-alkanes in crude oils from Lunnan Oilfield.

作 者： LU Hong LI Chao SUN Yongge PENG Ping'an XIAO Zhongyao   作者單位： LU Hong,LI Chao,SUN Yongge,PENG Ping'an(State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)

XIAO Zhongyao(Tarim Research Institute of Exploration and Development of Petroleum, China Petroleum, Korla 841000, China) 

刊 名： 中國科學(xué)D輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA SERIES D(EARTH SCIENCES)  年，卷(期)： 2005 48(8)  分類號(hào)： P5  關(guān)鍵詞： hydrogen isotopes   individual n-alkanes   distribution   hydrocarbon source   Lunnan Oilfield  

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