| Daily Variation of Natural Emission of Methane to the Atmosphere and Source Identification in the Luntai Fault Region of the Yakela Condensed Oil/Gas Field in the Tarim Basin, Xinjiang, China |
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| 作者姓名： | TANG Junhong BAO Zhengyu XIANG Wu GOU Qinghong |
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| 作者单位： | [1]Dept. of Environmental Engineering and Science, Hongzhou Danzi University, Hongzhou 310018, China [2]Key Laboratory of Biogeology and Environmental geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China [3]Dept. of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China |
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| 基金项目： | Acknowledgements This study was supported by the Natural Science Foundation of China （grant No. 40273034） and the Science Foundation of Hongzhou Danzi University. |
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| 摘 要： | The static flux chamber method was applied to study natural emissions of methane to the atmosphere in the Luntai fault region of Yakela Condensed Oil/Gas Field in the Tarim Basin, Xinjiang Municipality, northwestern China. Using an online method, which couples together a gas chromatography/high-temperature conversion/isotope ratio mass spectrometry （GC/C/MS）, 13^C/12^C ratios of methane in flux chambers were measured and showed that methane gases are liable to migrate from deep oil/gas reservoirs to the surface through fault regions and that a part of the migrated methane, which remains unoxidized can be emitted into the atmosphere. Methane emission rates were found to be highest in the mornings, lowest in the afternoons and then increase gradually in the evenings. Methane emission rates varied dramatically in different locations in the fault region. The highest methane emission rate was 10.96 mg/m^2·d, the lowest 4.38 mg/m^2, and the average 7.55 mg/ m^2·d. The 13^C/12^C ratios of the methane in the flux chambers became heavier as the enclosed methane concentrations increased gradually, which reveals that methane released from the fault region might come from thermogenic methane of the deep condensed oil/gas reservoir.
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| 关 键 词： | 油田 气体 碳同位素 新疆 |
| 修稿时间： | 2006-07-31 |
Daily Variation of Natural Emission of Methane to the Atmosphere and Source Identification in the Luntai Fault Region of the Yakela Condensed Oil/Gas Field in the Tarim Basin, Xinjiang, China |
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| Authors: | TANG Junhong BAO Zhengyu XIANG Wu GOU Qinghong |
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| Abstract: | The static flux chamber method was applied to study natural emissions of methane to the atmosphere in the Luntai fault region of Yakela Condensed Oil/Gas Field in the Tarim Basin,Xinjiang Municipality, northwestern China. Using an online method, which couples together a gas chromatography/high-temperature conversion/isotope ratio mass spectrometry (GC/C/MS), 13C/12C ratios of methane in flux chambers were measured and showed that methane gases are liable to migrate from deep oil/gas reservoirs to the surface through fault regions and that a part of the migrated methane, which remains unoxidized can be emitted into the atmosphere. Methane emission rates were found to be highest in the mornings, lowest in the afternoons and then increase gradually in the evenings. Methane emission rates varied dramatically in different locations in the fault region. The concentrations increased gradually, which reveals that methane released from the fault region might come from thermogenic methane of the deep condensed oil/gas reservoir. |
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| Keywords: | condensed oil/gas field fault-controlled methane emission carbon isotopes flux chamber Xinjiang |
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