Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, China
This study aims to characterize the pore structures and controlling factors of the Shan-1 Member reservoir in the southwestern Ordos Basin, a geological formation known for its significant gas production. Thin section analysis, scanning electron microscopy, high-pressure mercury intrusion (MICP), an...
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-12-01
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| Series: | Open Geosciences |
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| Online Access: | https://doi.org/10.1515/geo-2022-0746 |
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| author | Xu Guangjun Li Hao Tang Lei Gong Xiaoke Xie Yuxin Zhao Danni Chen Jiangmeng Wei Qinlian |
| author_facet | Xu Guangjun Li Hao Tang Lei Gong Xiaoke Xie Yuxin Zhao Danni Chen Jiangmeng Wei Qinlian |
| author_sort | Xu Guangjun |
| collection | DOAJ |
| description | This study aims to characterize the pore structures and controlling factors of the Shan-1 Member reservoir in the southwestern Ordos Basin, a geological formation known for its significant gas production. Thin section analysis, scanning electron microscopy, high-pressure mercury intrusion (MICP), and reservoir physical property analysis were employed to investigate the pore structures within the reservoir. The Shan-1 Member reservoir is primarily characterized by lithic dissolution and intergranular pores, with generally small throat radii. Reservoirs with high quartz content (>70%) are associated with the development and preservation of primary pores, resulting in superior pore structures (Types I and II) with larger pore throats. Similarly, reservoirs with low lithic content (<10%) exhibit Type I and II pore structures, also with larger median pore throat radii. In contrast, Type III and IV pore structures, characterized by smaller median pore throat radii, are linked to higher lithic content. Compaction significantly degrades pore structures, while cementation and dissolution play key roles in controlling their variability. These processes underscore the complexity of the Shan-1 reservoir, with important implications for optimizing exploration strategies. This study provides novel insights into the interplay between mineral composition and diagenetic processes in shaping pore structures, offering valuable guidance for the exploration of tight gas reservoirs within the Permian strata of the southwestern Ordos Basin. |
| format | Article |
| id | doaj-art-2c48633d8cc1437b8f7dfa21c6514697 |
| institution | Kabale University |
| issn | 2391-5447 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | De Gruyter |
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| series | Open Geosciences |
| spelling | doaj-art-2c48633d8cc1437b8f7dfa21c65146972025-01-02T06:02:58ZengDe GruyterOpen Geosciences2391-54472024-12-011616819210.1515/geo-2022-0746Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, ChinaXu Guangjun0Li Hao1Tang Lei2Gong Xiaoke3Xie Yuxin4Zhao Danni5Chen Jiangmeng6Wei Qinlian7No. 2 Gas Plant, PetroChina Changqing Oilfield Company, Yulin, 719000, Shananxi, ChinaNo. 2 Gas Plant, PetroChina Changqing Oilfield Company, Yulin, 719000, Shananxi, ChinaNo. 2 Gas Plant, PetroChina Changqing Oilfield Company, Yulin, 719000, Shananxi, ChinaNo. 2 Gas Plant, PetroChina Changqing Oilfield Company, Yulin, 719000, Shananxi, ChinaNo. 2 Gas Plant, PetroChina Changqing Oilfield Company, Yulin, 719000, Shananxi, ChinaNo. 2 Gas Plant, PetroChina Changqing Oilfield Company, Yulin, 719000, Shananxi, ChinaNo. 2 Gas Plant, PetroChina Changqing Oilfield Company, Yulin, 719000, Shananxi, ChinaSchool of Earth Science and Engineering, Xi’an Shiyou University, No. 18 2th Dianzi Road, Yanta District, Xi’an, 710065, Shananxi, ChinaThis study aims to characterize the pore structures and controlling factors of the Shan-1 Member reservoir in the southwestern Ordos Basin, a geological formation known for its significant gas production. Thin section analysis, scanning electron microscopy, high-pressure mercury intrusion (MICP), and reservoir physical property analysis were employed to investigate the pore structures within the reservoir. The Shan-1 Member reservoir is primarily characterized by lithic dissolution and intergranular pores, with generally small throat radii. Reservoirs with high quartz content (>70%) are associated with the development and preservation of primary pores, resulting in superior pore structures (Types I and II) with larger pore throats. Similarly, reservoirs with low lithic content (<10%) exhibit Type I and II pore structures, also with larger median pore throat radii. In contrast, Type III and IV pore structures, characterized by smaller median pore throat radii, are linked to higher lithic content. Compaction significantly degrades pore structures, while cementation and dissolution play key roles in controlling their variability. These processes underscore the complexity of the Shan-1 reservoir, with important implications for optimizing exploration strategies. This study provides novel insights into the interplay between mineral composition and diagenetic processes in shaping pore structures, offering valuable guidance for the exploration of tight gas reservoirs within the Permian strata of the southwestern Ordos Basin.https://doi.org/10.1515/geo-2022-0746tight reservoirpore structureshan-1permianordos basin |
| spellingShingle | Xu Guangjun Li Hao Tang Lei Gong Xiaoke Xie Yuxin Zhao Danni Chen Jiangmeng Wei Qinlian Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, China Open Geosciences tight reservoir pore structure shan-1 permian ordos basin |
| title | Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, China |
| title_full | Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, China |
| title_fullStr | Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, China |
| title_full_unstemmed | Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, China |
| title_short | Influence of pore structure characteristics on the Permian Shan-1 reservoir in Longdong, Southwest Ordos Basin, China |
| title_sort | influence of pore structure characteristics on the permian shan 1 reservoir in longdong southwest ordos basin china |
| topic | tight reservoir pore structure shan-1 permian ordos basin |
| url | https://doi.org/10.1515/geo-2022-0746 |
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