成煤母质形成环境对热成因煤层气氢碳同位素的影响:不同气候环境的草本沼泽泥炭热模拟实验

段毅; 段明辰; 吴应忠; 姚泾利; 罗安湘; 邓秀芹; 齐亚林

doi:10.3799/dqkx.2017.520

Volume 42 Issue 9

Sep. 2017

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Article Navigation > Earth Science > 2017 > 42(9): 1541-1548

Duan Yi, Duan Mingchen, Wu Yingzhong, Yao Jingli, Luo Anxiang, Deng Xiuqin, Qi Yalin, 2017. Impact of Formation Environment of Coal-Forming Material on Hydrogen and Carbon Isotopic Compositions of Thermogenic Coalbed Gas:Thermal Simulation of Herbaceous Marsh Peats Formed under Different Climatic Environments. Earth Science, 42(9): 1541-1548. doi: 10.3799/dqkx.2017.520

Citation:

Duan Yi, Duan Mingchen, Wu Yingzhong, Yao Jingli, Luo Anxiang, Deng Xiuqin, Qi Yalin, 2017. Impact of Formation Environment of Coal-Forming Material on Hydrogen and Carbon Isotopic Compositions of Thermogenic Coalbed Gas:Thermal Simulation of Herbaceous Marsh Peats Formed under Different Climatic Environments. Earth Science, 42(9): 1541-1548. doi: 10.3799/dqkx.2017.520

Citation:

Duan Yi, Duan Mingchen, Wu Yingzhong, Yao Jingli, Luo Anxiang, Deng Xiuqin, Qi Yalin, 2017. Impact of Formation Environment of Coal-Forming Material on Hydrogen and Carbon Isotopic Compositions of Thermogenic Coalbed Gas:Thermal Simulation of Herbaceous Marsh Peats Formed under Different Climatic Environments. Earth Science, 42(9): 1541-1548. doi: 10.3799/dqkx.2017.520

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Impact of Formation Environment of Coal-Forming Material on Hydrogen and Carbon Isotopic Compositions of Thermogenic Coalbed Gas:Thermal Simulation of Herbaceous Marsh Peats Formed under Different Climatic Environments

doi: 10.3799/dqkx.2017.520

1.
Gansu Provincial Key Laboratory of Petroleum Resources/Key Laboratory of Petroleum Resources Research, Chinese Academy of Sciences/Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2.
School of Economics and Management, Gansu Institute of Political Science and Law, Lanzhou 730070, China
3.
School of Earth Science & Resources, Chang'an University, Xi'an 710054, China
4.
School of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
5.
Exploration and Development Institute of Changqing Oilfield Company, CNPC, Xi'an 710018, China

Received Date: 2016-12-28
Publish Date: 2017-09-15

Abstract

Abstract

The study of coalbed methane (CBM) can provide scientific basis for coalbed methane exploration and development. However, the hydrogen and carbon isotopic compositions of CBM are affected by many factors. Previous studies were mainly concerned with the influence of the properties of gas-forming parent material and maturity on the hydrogen and carbon isotopic compositions of CBM. The influence of formation environment of gas-forming parent material on the isotopic compositions of thermogenic CBM is still unclear. Closed-system isothermal pyrolysis experiments were performed on herbaceous marsh peats derived from high latitude area with cold and dry climates and low latitude area with tropical moist climate. The hydrogen and carbon isotopic compositions and their differences of the hydrocarbon gases (methane, ethane and propane) generated during the pyrolysis of the samples were studied. The results show that the hydrocarbon gases generated from the herbaceous swamp peat in high latitude area had lighter hydrogen and heavier carbon isotopic compositions compared with those in low latitude area. At pyrolysis intervals from peat to vitrinite reflectance values (R_o) of 2.5%, 3.5% and 5.5%, the differences in the average δD values between the samples in high latitude and low latitude areas were from -17‰ to -10‰ for methane, -32‰ to -28‰ for ethane and -25‰ to -17‰ for propane, and in the average δ¹³C values between them were 2.9‰ to 3.6‰ for methane and 0.9‰ to 1.1‰ for ethane, respectively. The differences should result from the influence of climatic environment on hydrogen and carbon isotopic compositions of coal-forming original material. The relationship between R_o values and the hydrogen and carbon isotopic compositions of gases generated by coal-forming organic matter under different climatic environments as well as the hydrogen or carbon isotopic relationships of methane and ethane were established. These results may provide a basis for studying on the genesis of coalbed gas formed by coal-forming material under different climatic environments.
- peat,
- simulation experiment,
- gas product,
- hydrogen and carbon isotopes,
- climatic environment,
- coalbed gas origin,
- geochemistry

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References(40)

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Impact of Formation Environment of Coal-Forming Material on Hydrogen and Carbon Isotopic Compositions of Thermogenic Coalbed Gas:Thermal Simulation of Herbaceous Marsh Peats Formed under Different Climatic Environments

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