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Geochemical identification of coal-sourced oils and interbedded shale-sourced oils as revealed by compound specific carbon isotopic analysis
Authors:Sun Yongge  Wang Zhiyong  Sheng Guoying  Zhang Shihuan  Peng Ping’an  Fu Jiamo  Wang Wuhe  Yuan Mingshen
Affiliation:(1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) Tuha Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation, 839001 Xinjiang, China
Abstract:To date, questions remain as to how to differentiate between coaland interbedded shale-sourced oils in coal measures. Based on the hypothesis that δ13C value of sedimentary organic matter is controlled by the depositional environment and productivities of biota grown in such depositional setting, this note examines compound specific carbon isotopic profiles from coal and interbedded shale extracts using the gas chromatography-isotope ratio mass spectrometry technique (GC/IRMS). The results show that compound specific carbon isotope values from coal extracts are enriched in13C relative to that of interbedded shale extracts, and provide useful information in characterizing coal- and interbedded shale-sourced oils in coal measures. An example for its successful application from the Turpan Basin, Northwestern China is presented.
Keywords:compound specific carbon isotope  productivities of biota  coal-derived oil  Turpan Basin
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