Gas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei Coalfield
Abstract The objective of this work is to investigate the implications of geological influence factors on gas content and geochemical characteristics of deep-buried (> 800 m) coalbed methane (CBM) reservoirs. Results show that bituminous coal accounts for the majority, which exhibits similar matu...
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Nature Portfolio
2024-11-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-79922-x |
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| author | Qiang Wei Song Chen Wangfei Yi Herong Gui Wei Jiang Fengli Li Shengjie Li |
| author_facet | Qiang Wei Song Chen Wangfei Yi Herong Gui Wei Jiang Fengli Li Shengjie Li |
| author_sort | Qiang Wei |
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| description | Abstract The objective of this work is to investigate the implications of geological influence factors on gas content and geochemical characteristics of deep-buried (> 800 m) coalbed methane (CBM) reservoirs. Results show that bituminous coal accounts for the majority, which exhibits similar maturity but differ in maceral and chemical constituents. CBM reservoirs show low porosity, low permeability and moderate temperature, with thickness of 0.85–4.15 m. In addition, the total gas content is 4.58–12.33 m3/t (average of 8.83 m3/t). CH4 is the main component with concentration of 92.83−99.22% (average of 96.68%), and the δ13CCH4 and δ13DCH4 is − 53.78‰–−44.62‰ (average of − 48.82‰) and − 223.93‰––−4.49‰ (average of − 215.37‰), respectively. All CBM samples are the mixtures of thermogenic gases and secondary biogenic gases with CO2 reduction. In addition, gas content characteristic at the critical point of burial depth is the result by positive and negative geological effects. CH4 concentration shows a wide range with the increases of buried depth, while the numerical values of which for the selected samples display complex variation characteristics. Furthermore, the values of δ13CCH4 and δ13DCH4 become heavier with the increases of buried depth. Besides, the above two geochemical parameters are related to R o, max and reservoir temperature. |
| format | Article |
| id | doaj-art-0839efa026724226945bf4be05aad54d |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Nature Portfolio |
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| spelling | doaj-art-0839efa026724226945bf4be05aad54d2024-11-17T12:25:09ZengNature PortfolioScientific Reports2045-23222024-11-0114112410.1038/s41598-024-79922-xGas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei CoalfieldQiang Wei0Song Chen1Wangfei Yi2Herong Gui3Wei Jiang4Fengli Li5Shengjie Li6Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze UniversitySchool of Resources and Civil Engineering, Suzhou UniversityHubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze UniversitySchool of Resources and Civil Engineering, Suzhou UniversitySchool of Resources and Civil Engineering, Suzhou UniversitySchool of Resources and Civil Engineering, Suzhou UniversitySchool of Resources and Civil Engineering, Suzhou UniversityAbstract The objective of this work is to investigate the implications of geological influence factors on gas content and geochemical characteristics of deep-buried (> 800 m) coalbed methane (CBM) reservoirs. Results show that bituminous coal accounts for the majority, which exhibits similar maturity but differ in maceral and chemical constituents. CBM reservoirs show low porosity, low permeability and moderate temperature, with thickness of 0.85–4.15 m. In addition, the total gas content is 4.58–12.33 m3/t (average of 8.83 m3/t). CH4 is the main component with concentration of 92.83−99.22% (average of 96.68%), and the δ13CCH4 and δ13DCH4 is − 53.78‰–−44.62‰ (average of − 48.82‰) and − 223.93‰––−4.49‰ (average of − 215.37‰), respectively. All CBM samples are the mixtures of thermogenic gases and secondary biogenic gases with CO2 reduction. In addition, gas content characteristic at the critical point of burial depth is the result by positive and negative geological effects. CH4 concentration shows a wide range with the increases of buried depth, while the numerical values of which for the selected samples display complex variation characteristics. Furthermore, the values of δ13CCH4 and δ13DCH4 become heavier with the increases of buried depth. Besides, the above two geochemical parameters are related to R o, max and reservoir temperature.https://doi.org/10.1038/s41598-024-79922-xGas contentGeochemical characteristicsDeep CBM reservoirThe Deep Area of Qi’Nan CoalmineThe Huaibei Coalfield. |
| spellingShingle | Qiang Wei Song Chen Wangfei Yi Herong Gui Wei Jiang Fengli Li Shengjie Li Gas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei Coalfield Scientific Reports Gas content Geochemical characteristics Deep CBM reservoir The Deep Area of Qi’Nan Coalmine The Huaibei Coalfield. |
| title | Gas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei Coalfield |
| title_full | Gas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei Coalfield |
| title_fullStr | Gas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei Coalfield |
| title_full_unstemmed | Gas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei Coalfield |
| title_short | Gas content, geochemical characteristics and implications of coalbed methane from the Deep Area of Qi’Nan Coalmine in Huaibei Coalfield |
| title_sort | gas content geochemical characteristics and implications of coalbed methane from the deep area of qi nan coalmine in huaibei coalfield |
| topic | Gas content Geochemical characteristics Deep CBM reservoir The Deep Area of Qi’Nan Coalmine The Huaibei Coalfield. |
| url | https://doi.org/10.1038/s41598-024-79922-x |
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