| Genetic identification of natural gases from shallow reservoirs in some oil- and gas-bearing basins of China |
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| 作者姓名： | 王万春 刘文汇 徐永昌 沈平 康晏 任军虎 |
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| 作者单位： | Key Laboratory of Gas Geochemistry，Lanzhou Institute of Geology，Chinese Academy of Sciences，Lanzhou 730000，China，Graduate School，Chinese Academy of Sciences，Beijing 100039，China，Key Laboratory of Gas Geochemistry，Lanzhou Institute of Geology，Chinese Academy of Sciences，Lanzhou 730000，China，Key Laboratory of Gas Geochemistry，Lanzhou Institute of Geology，Chinese Academy of Sciences，Lanzhou 730000，China，Key Laboratory of Gas Geochemistry，Lanzhou Institute of Geology，Chinese Academy of Sciences，Lanzhou 730000，China，Key Laboratory of Gas Geochemistry，Lanzhou Institute of Geology，Chinese Academy of Sciences，Lanzhou 730000，China，Key Laboratory of Gas Geochemistry，Lanzhou Institute of Geology，Chinese Academy of Sciences，Lanzhou 730000，China |
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| 基金项目： | 科技部资助项目，国家自然科学基金 |
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| 摘 要： | Natural gases of shallow reservoirs with the carbon isotopic compositions of methane ranging from -50‰ to -60‰ (PDB) were considered as mixed gases of biogenic and thermogenic origins previously and some of them were considered as low-mature (or low temperature thermogenic) gases lately. In this paper natural gases with the carbon isotopic compositions of methane in the above range were identified using the molecular and stable carbon isotopic compositions of methane, ethane and propane. The mixed gases of biogenic and mature thermogenic origins display the characteristics of δ 13 C1 ranging from -50‰to -60‰,δ13C2 ＞ -35‰,Δvalues (δ13C3 -δ13C2) ＜ 5‰ and C1/∑C2 ratios ＜ 40. Immature to low-mature gases display the characteristics of δ 13 C1 ranging from - 50‰ to - 60‰, δ13 C2 ＜- 40‰,Δ values (δ13C3 -δ13C2) ＞7‰, and C1/∑C 2 ratios ＞60.
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| 关 键 词： | 天然气 浅储集层 碳同位素 地质勘探 |
Genetic identification of natural gases from shallow reservoirs in some oil- and gas-bearing basins of China |
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| Wang Wanchun,Liu Wenhui,Xu Yongchang,Shen Ping,Kang Yan,Ren Junhu.Genetic identification of natural gases from shallow reservoirs in some oil- and gas-bearing basins of China[J].Chinese Journal of Geochemistry,2005,24(1):90-94. |
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| Authors: | Wang Wanchun Liu Wenhui Xu Yongchang Shen Ping Kang Yan Ren Junhu |
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| Institution: | (1) Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000 Lanzhou, China;(2) Graduate School, Chinese Academy of Sciences, 100039 Beijing, China |
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| Abstract: | Natural gases of shallow reservoirs with the carbon isotopic compositions of methane ranging from −50‰ to −60‰ (PDB) were
considered as mixed gases of biogenic and thermogenic origins previously and some of them were considered as low-mature (or
low temperature thermogenic) gases lately. In this paper natural gases with the carbon isotopic compositions of methane in
the above range were identified using the molecular and stable carbon isotopic compositions of methane, ethane and propane.
The mixed gases of biogenic and mature thermogenic origins display the characteristics of δ13C1 ranging from −50‰ to −60‰, δ13C2>−35‰, Δ values (δ13C3 - δ13C2)<5‰ and C1/ΣC
2
+
ratios <40. Immature to low-mature gases display the characteristics of δ13C1 ranging from −50‰ to −60‰, δ13C2<−40‰, Δ values (δ13C3 - δ13C2)>7‰, and C1/ΣC
2
+
ratios >60.
This work was financially supported by the Ministry of Science and Technology of China (Grant No. 2001CB209102) and the National
Natural Science Foundation of China (Grant No. 40072049). |
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| Keywords: | natural gas shallow reservoir carbon isotope origin |
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