Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal Characterization
Characteristics of pore structure are crucial to oil exploration and development in shale reservoirs, but practical evaluation of shale pore structure remains a longstanding challenge. In this study, based on nuclear magnetic resonance transverse relaxation time (T2) spectra under water-saturated an...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi-Wiley
2023-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2023/3042994 |
| _version_ | 1797834804019855360 |
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| author | Quanqi Dai Yingfu He Da Zheng Yangwen Zhu Rui Wang Hongmin Yu Yinbang Zhou Guiwen Wang Yafeng Li Hao Wu |
| author_facet | Quanqi Dai Yingfu He Da Zheng Yangwen Zhu Rui Wang Hongmin Yu Yinbang Zhou Guiwen Wang Yafeng Li Hao Wu |
| author_sort | Quanqi Dai |
| collection | DOAJ |
| description | Characteristics of pore structure are crucial to oil exploration and development in shale reservoirs, but practical evaluation of shale pore structure remains a longstanding challenge. In this study, based on nuclear magnetic resonance transverse relaxation time (T2) spectra under water-saturated and irreducible conditions, total pore space and moveable fluid space were skillfully determined. Meanwhile, multifractal spectra were used to characterize T2 distributions of total pore space and movable fluid space. The results show characteristic parameters of high probability measure areas of multifractal spectra (multifractal parameters) have strong negative correlations with T2 geometric mean value, and average radii of pore and throat increase with a decrease in the multifractal parameters, indicating the shale reservoirs with low values of the multifractal parameters may have good pore structure. Moreover, clay mineral content has strong positive effects on the multifractal parameters. In contrast, (quartz+feldspar) mineral content negatively influences on the multifractal parameters. Finally, new accurate models for permeability estimation in core scale and well-logging scale of shales are both proposed based on the multifractal parameters, which are also applicable for the other reservoirs. Overall, this study is important and timely for evaluating pore structure and predicting permeability in shale reservoirs. |
| first_indexed | 2024-04-09T14:43:19Z |
| format | Article |
| id | doaj.art-4b7b6c14865546b3bbd1e4a668bd8a85 |
| institution | Directory Open Access Journal |
| issn | 1468-8123 |
| language | English |
| last_indexed | 2024-04-09T14:43:19Z |
| publishDate | 2023-01-01 |
| publisher | Hindawi-Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj.art-4b7b6c14865546b3bbd1e4a668bd8a852023-05-03T00:00:13ZengHindawi-WileyGeofluids1468-81232023-01-01202310.1155/2023/3042994Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal CharacterizationQuanqi Dai0Yingfu He1Da Zheng2Yangwen Zhu3Rui Wang4Hongmin Yu5Yinbang Zhou6Guiwen Wang7Yafeng Li8Hao Wu9State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentState Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentResearch Institute of Petroleum Exploration & DevelopmentState Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentState Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentState Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentState Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentCollege of GeosciencesResearch Institute of Exploration and ExploitationSchool of Earth SciencesCharacteristics of pore structure are crucial to oil exploration and development in shale reservoirs, but practical evaluation of shale pore structure remains a longstanding challenge. In this study, based on nuclear magnetic resonance transverse relaxation time (T2) spectra under water-saturated and irreducible conditions, total pore space and moveable fluid space were skillfully determined. Meanwhile, multifractal spectra were used to characterize T2 distributions of total pore space and movable fluid space. The results show characteristic parameters of high probability measure areas of multifractal spectra (multifractal parameters) have strong negative correlations with T2 geometric mean value, and average radii of pore and throat increase with a decrease in the multifractal parameters, indicating the shale reservoirs with low values of the multifractal parameters may have good pore structure. Moreover, clay mineral content has strong positive effects on the multifractal parameters. In contrast, (quartz+feldspar) mineral content negatively influences on the multifractal parameters. Finally, new accurate models for permeability estimation in core scale and well-logging scale of shales are both proposed based on the multifractal parameters, which are also applicable for the other reservoirs. Overall, this study is important and timely for evaluating pore structure and predicting permeability in shale reservoirs.http://dx.doi.org/10.1155/2023/3042994 |
| spellingShingle | Quanqi Dai Yingfu He Da Zheng Yangwen Zhu Rui Wang Hongmin Yu Yinbang Zhou Guiwen Wang Yafeng Li Hao Wu Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal Characterization Geofluids |
| title | Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal Characterization |
| title_full | Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal Characterization |
| title_fullStr | Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal Characterization |
| title_full_unstemmed | Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal Characterization |
| title_short | Evaluating Pore Structure of Shale Reservoirs through Pore Space Multifractal Characterization |
| title_sort | evaluating pore structure of shale reservoirs through pore space multifractal characterization |
| url | http://dx.doi.org/10.1155/2023/3042994 |
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