Multi-scale characterization of tight carbonate rocks based on digital cores
The characterization of carbonate microstructure is of great significance for the evaluation of carbonate oil and gas resources. However, due to the complexity and heterogeneity of the pore structure of tight carbonate rocks, high-pressure mercury intrusion, nuclear magnetic resonance (NMR) and othe...
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2025.1538316/full |
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| author | Changsheng Wang Changsheng Wang Lili Tian Lili Tian Chuanrui Sun Chuanrui Sun Yuwei Deng Yuwei Deng Ying Zhou Ying Zhou Xin Nie Xin Nie |
| author_facet | Changsheng Wang Changsheng Wang Lili Tian Lili Tian Chuanrui Sun Chuanrui Sun Yuwei Deng Yuwei Deng Ying Zhou Ying Zhou Xin Nie Xin Nie |
| author_sort | Changsheng Wang |
| collection | DOAJ |
| description | The characterization of carbonate microstructure is of great significance for the evaluation of carbonate oil and gas resources. However, due to the complexity and heterogeneity of the pore structure of tight carbonate rocks, high-pressure mercury intrusion, nuclear magnetic resonance (NMR) and other methods have different limitations in the characterization. This study takes tight carbonate core samples in the fourth member of the Ordovician Majiagou Formation in the Ordos Basin as the research object, and the rock physics experiments, computed tomography (CT), high resolution large-scale backscatter scanning electron microscopy (MAPS), quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN) and focused ion beam-scanning electron microscopy (FIB-SEM) was utilized to characterize the pore structure from micrometer to nanometer, revealing the main mineral composition, and systematically analyzing the relationship between different mineral and pore structures. The results show that the microscopic reservoir space in the study area is mainly composed of inter-crystalline pores, intra-crystalline pores and microfractures; there are obvious differences in the pore structure of different lithologies. The samples with more dolomite have the largest number of pores and throats, the largest coordination number, and the best connectivity; the samples with more calcite have the smallest pore radius. The presence of quartz is conducive to the preservation of pores. This multi-scale characterization method using digital core technology provides us with comprehensive pore characteristic, provides important clues for further understanding the pore structure of tight carbonate reservoirs. |
| format | Article |
| id | doaj-art-1c40b850346846348761a154b287905a |
| institution | Kabale University |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj-art-1c40b850346846348761a154b287905a2025-01-28T06:41:31ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-01-011310.3389/feart.2025.15383161538316Multi-scale characterization of tight carbonate rocks based on digital coresChangsheng Wang0Changsheng Wang1Lili Tian2Lili Tian3Chuanrui Sun4Chuanrui Sun5Yuwei Deng6Yuwei Deng7Ying Zhou8Ying Zhou9Xin Nie10Xin Nie11National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, ChinaExploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi’an, ChinaNational Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, ChinaExploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi’an, ChinaNational Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, ChinaKey Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Wuhan, ChinaNational Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, ChinaKey Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Wuhan, ChinaNational Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, ChinaKey Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Wuhan, ChinaNational Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, ChinaKey Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Wuhan, ChinaThe characterization of carbonate microstructure is of great significance for the evaluation of carbonate oil and gas resources. However, due to the complexity and heterogeneity of the pore structure of tight carbonate rocks, high-pressure mercury intrusion, nuclear magnetic resonance (NMR) and other methods have different limitations in the characterization. This study takes tight carbonate core samples in the fourth member of the Ordovician Majiagou Formation in the Ordos Basin as the research object, and the rock physics experiments, computed tomography (CT), high resolution large-scale backscatter scanning electron microscopy (MAPS), quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN) and focused ion beam-scanning electron microscopy (FIB-SEM) was utilized to characterize the pore structure from micrometer to nanometer, revealing the main mineral composition, and systematically analyzing the relationship between different mineral and pore structures. The results show that the microscopic reservoir space in the study area is mainly composed of inter-crystalline pores, intra-crystalline pores and microfractures; there are obvious differences in the pore structure of different lithologies. The samples with more dolomite have the largest number of pores and throats, the largest coordination number, and the best connectivity; the samples with more calcite have the smallest pore radius. The presence of quartz is conducive to the preservation of pores. This multi-scale characterization method using digital core technology provides us with comprehensive pore characteristic, provides important clues for further understanding the pore structure of tight carbonate reservoirs.https://www.frontiersin.org/articles/10.3389/feart.2025.1538316/fulltight carbonate rocksdigital core technologymulti-scale characterizationpore structureOrdos Basin |
| spellingShingle | Changsheng Wang Changsheng Wang Lili Tian Lili Tian Chuanrui Sun Chuanrui Sun Yuwei Deng Yuwei Deng Ying Zhou Ying Zhou Xin Nie Xin Nie Multi-scale characterization of tight carbonate rocks based on digital cores Frontiers in Earth Science tight carbonate rocks digital core technology multi-scale characterization pore structure Ordos Basin |
| title | Multi-scale characterization of tight carbonate rocks based on digital cores |
| title_full | Multi-scale characterization of tight carbonate rocks based on digital cores |
| title_fullStr | Multi-scale characterization of tight carbonate rocks based on digital cores |
| title_full_unstemmed | Multi-scale characterization of tight carbonate rocks based on digital cores |
| title_short | Multi-scale characterization of tight carbonate rocks based on digital cores |
| title_sort | multi scale characterization of tight carbonate rocks based on digital cores |
| topic | tight carbonate rocks digital core technology multi-scale characterization pore structure Ordos Basin |
| url | https://www.frontiersin.org/articles/10.3389/feart.2025.1538316/full |
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