Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin
The Linxing-Shenfu area in the Ordos Basin is one of the key areas for deep coalbed methane (CBM) development in China. However, significant variations in water production among CBM wells in different regions have hindered the efficient development of deep CBM. This study conducted multi-scale chara...
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Editorial Office of Petroleum Geology and Experiment
2025-01-01
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| Series: | Shiyou shiyan dizhi |
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| Online Access: | https://www.sysydz.net/cn/article/doi/10.11781/sysydz2025010054 |
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| author | Jinwei WANG Hao XU Yinan LIU Bing ZHANG Yanyong XU Ding LIU Peng ZONG Yajuan WANG Xuejing SONG |
| author_facet | Jinwei WANG Hao XU Yinan LIU Bing ZHANG Yanyong XU Ding LIU Peng ZONG Yajuan WANG Xuejing SONG |
| author_sort | Jinwei WANG |
| collection | DOAJ |
| description | The Linxing-Shenfu area in the Ordos Basin is one of the key areas for deep coalbed methane (CBM) development in China. However, significant variations in water production among CBM wells in different regions have hindered the efficient development of deep CBM. This study conducted multi-scale characterizations of coal samples from the 8#+9# coal seams in the Linxing-Shenfu area using high-pressure mercury intrusion porosimetry, low-temperature CO2 adsorption, low-temperature N2 adsorption, and CT scanning experiments. These methods revealed the development characteristics of the storage and permeability space in the study area. Water saturation simulation experiments were conducted to estimate the water storage capacity of coal samples, and numerical simulations were used to predict the water production capacity of deep reservoirs, providing a clear understanding of the water production capacity of deep coal reservoirs in the study area. Combined with actual water production data from CBM wells, the sources of coal seam water were further evaluated. The results show that deep coal reservoirs in the Linxing-Shenfu area exhibit well-developed micropores, macropores, and fractures, with relatively underdeveloped mesopores. As coal rank increases, the total pore volume first decreases and then increases. The original water content of deep coal samples declines sharply, while the water storage capacity first decreases and then increases, with bright coal showing a greater advantage in water storage capacity. The predicted daily water production ranges for low-vitrinite-reflectance (Ro) coal reservoirs in the study area are 12.81 to 26.01 m3, for medium-Ro coal reservoirs 1.82 to 7.22 m3, and for high-Ro coal reservoirs 1.90 to 8.22 m3. Actual water production exceeding these ranges indicates the influence from external water input, while production below these ranges indicates self-sourced water from the coal seams. Deep coal reservoirs have poor original water content and limited water storage capacity, especially in high-Ro coal reservoirs. Even when these reservoirs are fully saturated, water production remains low. Sustained high water output must involve substantial external water input. |
| format | Article |
| id | doaj-art-5ff678c3e07c4b9483f9ece52eee286d |
| institution | Kabale University |
| issn | 1001-6112 |
| language | zho |
| publishDate | 2025-01-01 |
| publisher | Editorial Office of Petroleum Geology and Experiment |
| record_format | Article |
| series | Shiyou shiyan dizhi |
| spelling | doaj-art-5ff678c3e07c4b9483f9ece52eee286d2025-02-09T07:48:48ZzhoEditorial Office of Petroleum Geology and ExperimentShiyou shiyan dizhi1001-61122025-01-01471546310.11781/sysydz2025010054sysydz-47-1-54Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos BasinJinwei WANG0Hao XU1Yinan LIU2Bing ZHANG3Yanyong XU4Ding LIU5Peng ZONG6Yajuan WANG7Xuejing SONG8School of Energy Resources, University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Energy Resources, University of Geosciences (Beijing), Beijing 100083, ChinaChina United Coalbed Methane Co., Ltd., Beijing 100016, ChinaChina United Coalbed Methane Co., Ltd., Beijing 100016, ChinaChina United Coalbed Methane Co., Ltd., Beijing 100016, ChinaSchool of Energy Resources, University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Energy Resources, University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Energy Resources, University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Energy Resources, University of Geosciences (Beijing), Beijing 100083, ChinaThe Linxing-Shenfu area in the Ordos Basin is one of the key areas for deep coalbed methane (CBM) development in China. However, significant variations in water production among CBM wells in different regions have hindered the efficient development of deep CBM. This study conducted multi-scale characterizations of coal samples from the 8#+9# coal seams in the Linxing-Shenfu area using high-pressure mercury intrusion porosimetry, low-temperature CO2 adsorption, low-temperature N2 adsorption, and CT scanning experiments. These methods revealed the development characteristics of the storage and permeability space in the study area. Water saturation simulation experiments were conducted to estimate the water storage capacity of coal samples, and numerical simulations were used to predict the water production capacity of deep reservoirs, providing a clear understanding of the water production capacity of deep coal reservoirs in the study area. Combined with actual water production data from CBM wells, the sources of coal seam water were further evaluated. The results show that deep coal reservoirs in the Linxing-Shenfu area exhibit well-developed micropores, macropores, and fractures, with relatively underdeveloped mesopores. As coal rank increases, the total pore volume first decreases and then increases. The original water content of deep coal samples declines sharply, while the water storage capacity first decreases and then increases, with bright coal showing a greater advantage in water storage capacity. The predicted daily water production ranges for low-vitrinite-reflectance (Ro) coal reservoirs in the study area are 12.81 to 26.01 m3, for medium-Ro coal reservoirs 1.82 to 7.22 m3, and for high-Ro coal reservoirs 1.90 to 8.22 m3. Actual water production exceeding these ranges indicates the influence from external water input, while production below these ranges indicates self-sourced water from the coal seams. Deep coal reservoirs have poor original water content and limited water storage capacity, especially in high-Ro coal reservoirs. Even when these reservoirs are fully saturated, water production remains low. Sustained high water output must involve substantial external water input.https://www.sysydz.net/cn/article/doi/10.11781/sysydz2025010054deep coalbed methanestorage and permeation spacewater production predictionwater production characteristicslinxing-shenfu areaordos basin |
| spellingShingle | Jinwei WANG Hao XU Yinan LIU Bing ZHANG Yanyong XU Ding LIU Peng ZONG Yajuan WANG Xuejing SONG Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin Shiyou shiyan dizhi deep coalbed methane storage and permeation space water production prediction water production characteristics linxing-shenfu area ordos basin |
| title | Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin |
| title_full | Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin |
| title_fullStr | Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin |
| title_full_unstemmed | Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin |
| title_short | Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin |
| title_sort | storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in linxing shenfu area of ordos basin |
| topic | deep coalbed methane storage and permeation space water production prediction water production characteristics linxing-shenfu area ordos basin |
| url | https://www.sysydz.net/cn/article/doi/10.11781/sysydz2025010054 |
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