Geochemical characteristics and source rock of Ordovician gas reservoir, Changqing Gasfield |
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Authors: | Xinyu Xia Lin Zhao Wenzheng Zhang Jianfeng Li |
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Institution: | (1) Research Institute of Petroleum Exploration and Development, 100083 Beijing, China;(2) Changqing Petroleum Exploration Bureau, 710021 Xi’an, China |
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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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Keywords: | methane ethane carbon isotope natural gas genesis Changqing Gasfield |
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