Geochemical identification of coal-sourced oils and interbedded shale-sourced oils as revealed by compound specific carbon isotopic analysis |
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Authors: | Sun Yongge Wang Zhiyong Sheng Guoying Zhang Shihuan Peng Ping’an Fu Jiamo Wang Wuhe Yuan Mingshen |
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Institution: | (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 |
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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. |
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Keywords: | compound specific carbon isotope productivities of biota coal-derived oil Turpan Basin |
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