Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution Morphologies
Characterizing the electrical properties of hydrate-bearing sediments, especially resistivity, is essential for reservoir identification and saturation evaluation. The variation in electrical properties depends on the evolution of pore habits, which in turn are influenced by the hydrate growth patte...
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MDPI AG
2023-06-01
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| Serier: | Journal of Marine Science and Engineering |
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| author | Xixi Lan Changchun Zou Cheng Peng Caowei Wu Yuanyuan Zhang Shengyi Wang |
| author_facet | Xixi Lan Changchun Zou Cheng Peng Caowei Wu Yuanyuan Zhang Shengyi Wang |
| author_sort | Xixi Lan |
| collection | DOAJ |
| description | Characterizing the electrical properties of hydrate-bearing sediments, especially resistivity, is essential for reservoir identification and saturation evaluation. The variation in electrical properties depends on the evolution of pore habits, which in turn are influenced by the hydrate growth pattern. To analyze the relationship between hydrate morphology and resistivity quantitatively, different micromorphologies of hydrates were simulated at the pore scale. This study was also conducted based on Maxwell’s equations for a constant current field. During numerical simulation, three types of hydrate occurrence patterns (grain-cementing, pore-filling and load-bearing) and five types of distribution morphologies (circle, square, square rotated by 45°, ellipse and ellipse rotated by 90°) in the pore-filling mode were considered. Moreover, the effects of porosity, the conductivity of seawater, the size of the pore-throat and other factors on resistivity are also discussed. The results show that the variation in resistivity with hydrate saturation can be broadly divided into three stages (basically no effect, slow change and rapid growth). Compared with the grain-cementing and pore-filling modes, the resistivity of the load-bearing mode was relatively high even when hydrate saturation was low. For high hydrate-saturated sediments (S<sub>h</sub> > 0.4), the saturation exponent <i>n</i> in Archie equation was taken as 2.42 ± 0.2. The size of the throat is furthermore the most critical factor affecting resistivity. This work shows the potential application prospects of the fine reservoir characterization and evaluation of hydrate-bearing sediments. |
| first_indexed | 2024-03-11T02:17:37Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-11T02:17:37Z |
| publishDate | 2023-06-01 |
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| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-aaf7acb56d32481cb15e5f122c675dd82023-11-18T11:06:50ZengMDPI AGJournal of Marine Science and Engineering2077-13122023-06-01116116910.3390/jmse11061169Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution MorphologiesXixi Lan0Changchun Zou1Cheng Peng2Caowei Wu3Yuanyuan Zhang4Shengyi Wang5School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaCharacterizing the electrical properties of hydrate-bearing sediments, especially resistivity, is essential for reservoir identification and saturation evaluation. The variation in electrical properties depends on the evolution of pore habits, which in turn are influenced by the hydrate growth pattern. To analyze the relationship between hydrate morphology and resistivity quantitatively, different micromorphologies of hydrates were simulated at the pore scale. This study was also conducted based on Maxwell’s equations for a constant current field. During numerical simulation, three types of hydrate occurrence patterns (grain-cementing, pore-filling and load-bearing) and five types of distribution morphologies (circle, square, square rotated by 45°, ellipse and ellipse rotated by 90°) in the pore-filling mode were considered. Moreover, the effects of porosity, the conductivity of seawater, the size of the pore-throat and other factors on resistivity are also discussed. The results show that the variation in resistivity with hydrate saturation can be broadly divided into three stages (basically no effect, slow change and rapid growth). Compared with the grain-cementing and pore-filling modes, the resistivity of the load-bearing mode was relatively high even when hydrate saturation was low. For high hydrate-saturated sediments (S<sub>h</sub> > 0.4), the saturation exponent <i>n</i> in Archie equation was taken as 2.42 ± 0.2. The size of the throat is furthermore the most critical factor affecting resistivity. This work shows the potential application prospects of the fine reservoir characterization and evaluation of hydrate-bearing sediments.https://www.mdpi.com/2077-1312/11/6/1169hydrate-bearing sedimentmicromorphology in porous mediaelectrical propertynumerical modelingsaturation exponent <i>n</i> |
| spellingShingle | Xixi Lan Changchun Zou Cheng Peng Caowei Wu Yuanyuan Zhang Shengyi Wang Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution Morphologies Journal of Marine Science and Engineering hydrate-bearing sediment micromorphology in porous media electrical property numerical modeling saturation exponent <i>n</i> |
| title | Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution Morphologies |
| title_full | Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution Morphologies |
| title_fullStr | Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution Morphologies |
| title_full_unstemmed | Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution Morphologies |
| title_short | Numerical Simulation of Electrical Properties for Pore-Scale Hydrate-Bearing Sediments with Different Occurrence Patterns and Distribution Morphologies |
| title_sort | numerical simulation of electrical properties for pore scale hydrate bearing sediments with different occurrence patterns and distribution morphologies |
| topic | hydrate-bearing sediment micromorphology in porous media electrical property numerical modeling saturation exponent <i>n</i> |
| url | https://www.mdpi.com/2077-1312/11/6/1169 |
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