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Geochemical characteristics and source rock of Ordovician gas reservoir, Changqing Gasfield

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Chinese Science Bulletin

Abstract

Carbon isotopic composition of methane in Ordovician gas reservoir in the Changqing Gasfield can reflect the dominance of Upper Paleozoic coaltype gas despite its high mature degree. The12C-rich ethane in the Ordovician reservoir (δ13C2 < −29%), known as a marker as oiltype gas, does not indicate the Ordovician marine carbonate as main source rock, it is because of the relative less ethane content in coaltype gas than in oiltyped gas due to generation and migration. The way of Upper Paleozoic coaltype gas migrating into the Ordovician reservoir is widely through the unconformlty instead of only through the erosion groove in the weathering crust.

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Authors and Affiliations

  1. Research Institute of Petroleum Exploration and Development, 100083, Beijing, China

    Xinyu Xia & Lin Zhao

  2. Changqing Petroleum Exploration Bureau, 710021, Xi’an, China

    Wenzheng Zhang & Jianfeng Li

Authors
  1. Xinyu Xia
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  2. Lin Zhao
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  3. Wenzheng Zhang
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  4. Jianfeng Li
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Xia, X., Zhao, L., Zhang, W. et al. Geochemical characteristics and source rock of Ordovician gas reservoir, Changqing Gasfield. Chin. Sci. Bull. 44, 1917–1920 (1999). https://doi.org/10.1007/BF02886354

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  • DOI: https://doi.org/10.1007/BF02886354

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