Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin
BackgroundNatural fractures serve as both the primary storage space for free gas of deep coalbed methane (CBM) and pathways for hydrocarbon migration. Furthermore, these fractures can enhance the porosity and permeability of strata under the deep, high-pressure condition, significantly amplifying th...
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Editorial Office of Coal Geology & Exploration
2025-04-01
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| Series: | Meitian dizhi yu kantan |
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| Online Access: | http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.24.08.0547 |
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| author | Jiangnan TONG Feng WANG Feng ZHANG Wei HOU Zhongbai LI Liang JI Yanan JIANG Wei SUN |
| author_facet | Jiangnan TONG Feng WANG Feng ZHANG Wei HOU Zhongbai LI Liang JI Yanan JIANG Wei SUN |
| author_sort | Jiangnan TONG |
| collection | DOAJ |
| description | BackgroundNatural fractures serve as both the primary storage space for free gas of deep coalbed methane (CBM) and pathways for hydrocarbon migration. Furthermore, these fractures can enhance the porosity and permeability of strata under the deep, high-pressure condition, significantly amplifying the permeability of coal seams. Therefore, the fine-scale characterization of the planar distribution of natural fractures is crucial to deep CBM production.Objectives and MethodsThis study investigated the No.8 coal seam in the Carboniferous Benxi Formation within the Daning-Jixian block on the eastern margin of the Ordos Basin. Through offset vector tiles (OVT) domain processing of offshore 3D wide-azimuth, broadband, and high-density (WBH) seismic data, this study determined five-dimensional seismic data: time, space (3D coordinates), offset (or shot-to-geophone distance), and azimuth. Then, fracture prediction was conducted through a pre-stack analysis of the azimuthal anisotropy attributes. Results and Conclusionsthis study developed a technical process for the five-dimensional seismic data-based interpretation that combined the methods of elliptical fitting and azimuthal statistics. The results reveal the presence of conjugate fracture systems in the study area: Yanshanian nearly EW/NEE- and Himalayan nearly SN/NNE-oriented fractures. The verification using multi-source data, including formation micro-imaging (FMI) logs, array acoustic logs, and fracturing curves, indicates that the azimuthal statistical method exhibited higher reliability in predicting fracture orientation (coincidence rate: 89 %) and developmental degree (prediction accuracy: 88.5 %). The results of this study have provided successful guidance for the optimization of horizontal well deployment, providing significant technical support for the efficient development of deep CBM. The relevant methodology can be widely applied to other basins bearing deep coal-bearing gas. |
| format | Article |
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| institution | OA Journals |
| issn | 1001-1986 |
| language | zho |
| publishDate | 2025-04-01 |
| publisher | Editorial Office of Coal Geology & Exploration |
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| series | Meitian dizhi yu kantan |
| spelling | doaj-art-dd8ae9f1dd1c43f4bcadc7f43d6162852025-08-20T01:47:55ZzhoEditorial Office of Coal Geology & ExplorationMeitian dizhi yu kantan1001-19862025-04-0153422223410.12363/issn.1001-1986.24.08.054724-08-0547tongjiangnanApplication of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos BasinJiangnan TONG0Feng WANG1Feng ZHANG2Wei HOU3Zhongbai LI4Liang JI5Yanan JIANG6Wei SUN7National Engineering Research of Coalbed Methane Development & Utilization, Beijing 100095, ChinaNational Engineering Research of Coalbed Methane Development & Utilization, Beijing 100095, ChinaResearch Institute of PetroChina Oriental Geophysical Company, Zhuozhou 072750, ChinaNational Engineering Research of Coalbed Methane Development & Utilization, Beijing 100095, ChinaNational Engineering Research of Coalbed Methane Development & Utilization, Beijing 100095, ChinaPetroChina Coalbed Methane Company Limited, Beijing 100028, ChinaNational Engineering Research of Coalbed Methane Development & Utilization, Beijing 100095, ChinaNational Engineering Research of Coalbed Methane Development & Utilization, Beijing 100095, ChinaBackgroundNatural fractures serve as both the primary storage space for free gas of deep coalbed methane (CBM) and pathways for hydrocarbon migration. Furthermore, these fractures can enhance the porosity and permeability of strata under the deep, high-pressure condition, significantly amplifying the permeability of coal seams. Therefore, the fine-scale characterization of the planar distribution of natural fractures is crucial to deep CBM production.Objectives and MethodsThis study investigated the No.8 coal seam in the Carboniferous Benxi Formation within the Daning-Jixian block on the eastern margin of the Ordos Basin. Through offset vector tiles (OVT) domain processing of offshore 3D wide-azimuth, broadband, and high-density (WBH) seismic data, this study determined five-dimensional seismic data: time, space (3D coordinates), offset (or shot-to-geophone distance), and azimuth. Then, fracture prediction was conducted through a pre-stack analysis of the azimuthal anisotropy attributes. Results and Conclusionsthis study developed a technical process for the five-dimensional seismic data-based interpretation that combined the methods of elliptical fitting and azimuthal statistics. The results reveal the presence of conjugate fracture systems in the study area: Yanshanian nearly EW/NEE- and Himalayan nearly SN/NNE-oriented fractures. The verification using multi-source data, including formation micro-imaging (FMI) logs, array acoustic logs, and fracturing curves, indicates that the azimuthal statistical method exhibited higher reliability in predicting fracture orientation (coincidence rate: 89 %) and developmental degree (prediction accuracy: 88.5 %). The results of this study have provided successful guidance for the optimization of horizontal well deployment, providing significant technical support for the efficient development of deep CBM. The relevant methodology can be widely applied to other basins bearing deep coal-bearing gas.http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.24.08.0547deep coalbed methane (cbm)natural fracturewide azimuth, broadband, and high-density (wbh) seismic dataseismic attributeoffset vector tiles (ovt) techniqueordos basindaning-jixian block |
| spellingShingle | Jiangnan TONG Feng WANG Feng ZHANG Wei HOU Zhongbai LI Liang JI Yanan JIANG Wei SUN Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin Meitian dizhi yu kantan deep coalbed methane (cbm) natural fracture wide azimuth, broadband, and high-density (wbh) seismic data seismic attribute offset vector tiles (ovt) technique ordos basin daning-jixian block |
| title | Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin |
| title_full | Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin |
| title_fullStr | Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin |
| title_full_unstemmed | Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin |
| title_short | Application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the Ordos Basin |
| title_sort | application of five seismic attributes in natural fracture prediction for deep coalbed methane production along the eastern margin of the ordos basin |
| topic | deep coalbed methane (cbm) natural fracture wide azimuth, broadband, and high-density (wbh) seismic data seismic attribute offset vector tiles (ovt) technique ordos basin daning-jixian block |
| url | http://www.mtdzykt.com/article/doi/10.12363/issn.1001-1986.24.08.0547 |
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