Comparative studies on compounds occluded inside asphaltenes hierarchically released by increasing amounts of H2O2/CH3COOH |
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| Authors: | Jing Zhao Zewen Liao Lühui Zhang Patrice Creux Chupeng Yang Anna Chrostowska Haizu Zhang Alain Graciaa |
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| Institution: | 1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Laboratoire des Fluides Complexes, UMR 5150 TOTAL-CNRS-UPPA, BP 1155, 64013 Pau Cedex, France;3. Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510760, China;4. Institut Pluridisciplinaire de Recherche sur l’Environnement et les Matériaux, UMR CNRS 5254, Université de Pau et des Pays de l’Adour, Av. de l’Université, BP 1155, 64013 Pau Cedex, France;5. Institute of Petroleum Exploration and Development, Tarim Oilfield Company, Korla 841000, China |
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| Abstract: | Being the heaviest fraction of crude oils, asphaltenes are liable to aggregate, and other molecules in the oils can be steadily adsorbed onto, and even occluded inside the macromolecular structures of the asphaltenes. These occluded compounds inside the asphaltenes can survive over geological time in oil reservoirs owing to effective protection by the macromolecular structures of the asphaltenes. The asphaltenes of a crude oil (ZG31) from the central Tarim Basin, NW China, were hierarchically degraded by increasing the amount of H2O2/CH3COOH to release the occluded compounds. Besides the common components, series of even numbered n-alk-1-enes and 3-ethylalkanes were detected among the occluded compounds. Comparison of the biomarker distributions and the compound-specific C isotopic results between the compounds from the maltenes and those from the occluded fraction, the ZG31 reservoir was suggested to have been charged multiple times, with different charges being derived from different strata of source rocks. |
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