Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern China
The Erlian Basin may be one of the most promising areas for low-rank coalbed methane (CBM) in China. The Cretaceous coal-bearing strata in the Bayanhua sag contain abundant low-rank CBM resources with suitable depths and large coal thicknesses (1.00–78.85 m, avg.22.53 m). However, the research on CB...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2022-05-01
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| Series: | Energy Exploration & Exploitation |
| Online Access: | https://doi.org/10.1177/01445987221082189 |
| _version_ | 1811306518573744128 |
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| author | Ling Li Dazhen Tang Hao Xu Shu Tao Shida Chen Shuling Tang Haipeng Yao |
| author_facet | Ling Li Dazhen Tang Hao Xu Shu Tao Shida Chen Shuling Tang Haipeng Yao |
| author_sort | Ling Li |
| collection | DOAJ |
| description | The Erlian Basin may be one of the most promising areas for low-rank coalbed methane (CBM) in China. The Cretaceous coal-bearing strata in the Bayanhua sag contain abundant low-rank CBM resources with suitable depths and large coal thicknesses (1.00–78.85 m, avg.22.53 m). However, the research on CBM geology and exploration potential is still lacking, which severely hinders its exploration and development. This paper presents an integrated study of CBM geology in terms of gas reservoir properties, gas-bearing characteristics and controlling factors. The results of the analysis show that lignite and subbituminous coals are the main coal types present in the study area, with medium porosity (7.3–27.8%, avg.20.77%) and low permeability (0.05–21.8 mD, avg.5.54 mD) being dominant. The pores are dominantly transition pores with inkpot shapes, which is beneficial to the adsorption of CBM. The gas content of the coal seams is 1.66–4.45 m 3 /t and most coal reservoirs are oversaturated. The CBM is primarily of secondary microbial origin, mostly carbon dioxide reduction. The accumulation of CBM is mainly influenced by the structure type, roof lithology and hydrogeology in the study area. According to the integrated analysis of the vertical changes in the physical properties and gas-bearing characteristics, the dominant horizon tends to be the No. 6-7 coal seam, followed by the No. 6-4 coal seam. Based upon the CBM geology and the factors controlling enrichment, the prospecting potential in the Bayanhua sag was appraised, and two favorable areas are proposed for CBM exploitation. |
| first_indexed | 2024-04-13T08:45:56Z |
| format | Article |
| id | doaj.art-c32e2e5507aa445393244b803783627e |
| institution | Directory Open Access Journal |
| issn | 0144-5987 2048-4054 |
| language | English |
| last_indexed | 2024-04-13T08:45:56Z |
| publishDate | 2022-05-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Energy Exploration & Exploitation |
| spelling | doaj.art-c32e2e5507aa445393244b803783627e2022-12-22T02:53:40ZengSAGE PublishingEnergy Exploration & Exploitation0144-59872048-40542022-05-014010.1177/01445987221082189Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern ChinaLing Li0Dazhen Tang1Hao Xu2Shu Tao3Shida Chen4Shuling Tang5Haipeng Yao6 Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, , Beijing, China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, , Beijing, China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, , Beijing, China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, , Beijing, China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, , Beijing, China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, , Beijing, China Inner Mongolia Coal Exploration Unconventional Energy CO., LTD, Hohhot, Inner Mongolia, ChinaThe Erlian Basin may be one of the most promising areas for low-rank coalbed methane (CBM) in China. The Cretaceous coal-bearing strata in the Bayanhua sag contain abundant low-rank CBM resources with suitable depths and large coal thicknesses (1.00–78.85 m, avg.22.53 m). However, the research on CBM geology and exploration potential is still lacking, which severely hinders its exploration and development. This paper presents an integrated study of CBM geology in terms of gas reservoir properties, gas-bearing characteristics and controlling factors. The results of the analysis show that lignite and subbituminous coals are the main coal types present in the study area, with medium porosity (7.3–27.8%, avg.20.77%) and low permeability (0.05–21.8 mD, avg.5.54 mD) being dominant. The pores are dominantly transition pores with inkpot shapes, which is beneficial to the adsorption of CBM. The gas content of the coal seams is 1.66–4.45 m 3 /t and most coal reservoirs are oversaturated. The CBM is primarily of secondary microbial origin, mostly carbon dioxide reduction. The accumulation of CBM is mainly influenced by the structure type, roof lithology and hydrogeology in the study area. According to the integrated analysis of the vertical changes in the physical properties and gas-bearing characteristics, the dominant horizon tends to be the No. 6-7 coal seam, followed by the No. 6-4 coal seam. Based upon the CBM geology and the factors controlling enrichment, the prospecting potential in the Bayanhua sag was appraised, and two favorable areas are proposed for CBM exploitation.https://doi.org/10.1177/01445987221082189 |
| spellingShingle | Ling Li Dazhen Tang Hao Xu Shu Tao Shida Chen Shuling Tang Haipeng Yao Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern China Energy Exploration & Exploitation |
| title | Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern China |
| title_full | Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern China |
| title_fullStr | Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern China |
| title_full_unstemmed | Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern China |
| title_short | Coalbed methane geology and exploration potential in large, thick, low-rank seams in the Bayanhua Sag of the Erlian Basin, northern China |
| title_sort | coalbed methane geology and exploration potential in large thick low rank seams in the bayanhua sag of the erlian basin northern china |
| url | https://doi.org/10.1177/01445987221082189 |
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