一种解释高-过成熟烷烃气碳同位素系列倒转的新观点：芳香烃脱甲基作用

彭威龙; 刘全有; 胡国艺; 吕玥; 孟庆强; 郭丰涛; 关海洋

doi:10.3799/dqkx.2019.133

Volume 45 Issue 4

Apr. 2020

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Article Navigation > Earth Science > 2020 > 45(4): 1308-1314

Peng Weilong, Liu Quanyou, Hu Guoyi, Lü Yue, Meng Qingqiang, Guo Fengtao, Guan Haiyang, 2020. A New Interpretation of Carbon Isotope Series Reverse of Highly-Over Mature Alkane Gases: Demethylation of Aromatic Hydrocarbons. Earth Science, 45(4): 1308-1314. doi: 10.3799/dqkx.2019.133

Citation:

Peng Weilong, Liu Quanyou, Hu Guoyi, Lü Yue, Meng Qingqiang, Guo Fengtao, Guan Haiyang, 2020. A New Interpretation of Carbon Isotope Series Reverse of Highly-Over Mature Alkane Gases: Demethylation of Aromatic Hydrocarbons. Earth Science, 45(4): 1308-1314. doi: 10.3799/dqkx.2019.133

Citation:

Peng Weilong, Liu Quanyou, Hu Guoyi, Lü Yue, Meng Qingqiang, Guo Fengtao, Guan Haiyang, 2020. A New Interpretation of Carbon Isotope Series Reverse of Highly-Over Mature Alkane Gases: Demethylation of Aromatic Hydrocarbons. Earth Science, 45(4): 1308-1314. doi: 10.3799/dqkx.2019.133

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A New Interpretation of Carbon Isotope Series Reverse of Highly-Over Mature Alkane Gases: Demethylation of Aromatic Hydrocarbons

doi: 10.3799/dqkx.2019.133

1.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, SINOPEC, Beijing 100083, China
2.
Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
3.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
4.
Exploration and Development Research Institute of Liaohe Oilfield Company, CNPC, Panjin 124010, China

Received Date: 2019-06-04
Publish Date: 2020-04-15

Abstract

Abstract

The genetic mechanism of natural gas is complex. In view of the fact that carbon isotope series reverse of alkane gas exists generally in the highly-over mature stage, and the organic matter in the highly-over mature stage is often rich in aromatic ring structure, the carbon isotope series reverse of alkane gas in the highly-over mature stage is discussed by means of pyrolysis experiments of aromatic hydrocarbons (toluene). The pyrolysis of toluene shows that the yield of alkane gas increases with the increase of simulated temperature, and the yield of H₂ in the product increases with the increase of simulated temperature. The distribution ranges of δ¹³C₁, δ¹³C₂ and δ¹³C₃ in toluene pyrolysis products are -31.8‰ to -27.7‰, -31.0‰ to -20.4‰ and -31.0‰ to -20.4‰, respectively. In the toluene thermal simulation experiment at 450℃, partial reversal of carbon isotope series of alkanes occurred (δ¹³C₁>δ¹³C₂ < δ¹³C₃). It is found that carbon isotope series reversal occurs in both coal type gas and oil type gas at highly-over mature stage. Combining with the simulation results, it is considered that aromatic hydrocarbon demethylation may be an important reason for carbon isotope series reversal in highly-over mature stage of alkane gas.
- thermal simulation experiment,
- natural gas,
- carbon isotope,
- aromatic hydrocarbon pyrolysis,
- toluene,
- hydrocarbons

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References(53)

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A New Interpretation of Carbon Isotope Series Reverse of Highly-Over Mature Alkane Gases: Demethylation of Aromatic Hydrocarbons

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