Pore-Type-Dependent Fractal Features of Shales and Implications on Permeability
Pore structure features govern the capacity of gas storage and migration in shales and are highly dependent on the types of pores, i.e., interparticle (InterP) pores, intraparticle (IntraP) pores and organic matter (OM)-hosted pores. However, fractal features in terms of pore types and their respect...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Fractal and Fractional |
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| Online Access: | https://www.mdpi.com/2504-3110/7/11/803 |
| _version_ | 1797459250515017728 |
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| author | Qian Zhang Yanhui Dong Shaoqing Tong |
| author_facet | Qian Zhang Yanhui Dong Shaoqing Tong |
| author_sort | Qian Zhang |
| collection | DOAJ |
| description | Pore structure features govern the capacity of gas storage and migration in shales and are highly dependent on the types of pores, i.e., interparticle (InterP) pores, intraparticle (IntraP) pores and organic matter (OM)-hosted pores. However, fractal features in terms of pore types and their respective contributions to permeability have been rarely addressed. On the basis of high-resolution imaging, fractal dimensions (<i>D</i>s) have been determined from both pore size distributions and digital rock to quantify the heterogeneity in pore morphology and spatial textures. Overall, OM-hosted pores are smaller in size and more abundant in quantity, corresponding to a relatively high <i>D</i>, while IntraP pores are mainly isolated and scarce, translating into lower <i>D</i> values. Additionally, crack-like InterP pores with a moderate level of porosity and the <i>D</i> can play a pivotal role in shale seepage potential. A comparison of the estimated permeability among different pore types highlights that the contribution of interconnected OM pores to the overall permeability remains constrained unless they can link neighboring pore clusters, as commonly observed in organo-clay composites. Furthermore, the pore morphology and fractal features of shale rocks can exhibit noteworthy variations subjected to sedimentology, mineralogy, diagenesis and OM maturation. |
| first_indexed | 2024-03-09T16:48:45Z |
| format | Article |
| id | doaj.art-4baa0c7cda2f42c6b84414c7bbd644d8 |
| institution | Directory Open Access Journal |
| issn | 2504-3110 |
| language | English |
| last_indexed | 2024-03-09T16:48:45Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fractal and Fractional |
| spelling | doaj.art-4baa0c7cda2f42c6b84414c7bbd644d82023-11-24T14:43:02ZengMDPI AGFractal and Fractional2504-31102023-11-0171180310.3390/fractalfract7110803Pore-Type-Dependent Fractal Features of Shales and Implications on PermeabilityQian Zhang0Yanhui Dong1Shaoqing Tong2Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaPore structure features govern the capacity of gas storage and migration in shales and are highly dependent on the types of pores, i.e., interparticle (InterP) pores, intraparticle (IntraP) pores and organic matter (OM)-hosted pores. However, fractal features in terms of pore types and their respective contributions to permeability have been rarely addressed. On the basis of high-resolution imaging, fractal dimensions (<i>D</i>s) have been determined from both pore size distributions and digital rock to quantify the heterogeneity in pore morphology and spatial textures. Overall, OM-hosted pores are smaller in size and more abundant in quantity, corresponding to a relatively high <i>D</i>, while IntraP pores are mainly isolated and scarce, translating into lower <i>D</i> values. Additionally, crack-like InterP pores with a moderate level of porosity and the <i>D</i> can play a pivotal role in shale seepage potential. A comparison of the estimated permeability among different pore types highlights that the contribution of interconnected OM pores to the overall permeability remains constrained unless they can link neighboring pore clusters, as commonly observed in organo-clay composites. Furthermore, the pore morphology and fractal features of shale rocks can exhibit noteworthy variations subjected to sedimentology, mineralogy, diagenesis and OM maturation.https://www.mdpi.com/2504-3110/7/11/803shale rockpore typestructural featurefractal dimensionpermeability |
| spellingShingle | Qian Zhang Yanhui Dong Shaoqing Tong Pore-Type-Dependent Fractal Features of Shales and Implications on Permeability Fractal and Fractional shale rock pore type structural feature fractal dimension permeability |
| title | Pore-Type-Dependent Fractal Features of Shales and Implications on Permeability |
| title_full | Pore-Type-Dependent Fractal Features of Shales and Implications on Permeability |
| title_fullStr | Pore-Type-Dependent Fractal Features of Shales and Implications on Permeability |
| title_full_unstemmed | Pore-Type-Dependent Fractal Features of Shales and Implications on Permeability |
| title_short | Pore-Type-Dependent Fractal Features of Shales and Implications on Permeability |
| title_sort | pore type dependent fractal features of shales and implications on permeability |
| topic | shale rock pore type structural feature fractal dimension permeability |
| url | https://www.mdpi.com/2504-3110/7/11/803 |
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