期刊
TRANSPORT IN POROUS MEDIA
卷 143, 期 3, 页码 739-763出版社
SPRINGER
DOI: 10.1007/s11242-022-01807-2
关键词
Unresolved pore; X-ray CT; NMR; Pore size distribution; Direct numerical simulation; Carbonate rock
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1A2C1014815, NRF-2021R1A5A1032433, 2019R1A6A3A03032835]
- Energy Efficiency and Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korean government Ministry of Trade, Industry and Energy [20152510101980]
- Basic Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM) - Ministry of Science and ICT [GP2020-025/006]
- National Research Foundation of Korea [2019R1A6A3A03032835, 2020R1A2C1014815] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study proposes the construction of a ternary-phase domain model through the fusion of X-ray CT imaging and nuclear magnetic resonance measurements. The model includes resolved apparent-pore, unresolved gray-pore, and resolved solid voxels. Analysis of X-ray CT images of carbonate rocks from Abu Dhabi reveals that fluid flow can pass through the unresolved gray-pore region. Additionally, a modified hydraulic tortuosity model is proposed to evaluate the tortuosity of the ternary-phase domain.
Due to the heterogeneity of carbonate rocks, some small pores partially undertaking flows are unresolved in X-ray CT images, therefore have been not appropriately considered in direct flow simulation. By the data fusion of two non-destructive measurements from X-ray CT imaging and nuclear magnetic resonance measurement, this study proposes the construction of ternary-phase domain including resolved apparent-pore, unresolved gray-pore, and resolved solid voxels. Gray-pore voxel containing the unresolved pore is characterized as a microporous structure with equivalent local hydraulic properties according to CT number and pore size distribution. From X-ray CT images of reservoir carbonate rocks from Abu Dhabi, ternary-phase domains are constructed consistently to figure out local and overall flow behaviors despite the different image resolutions. Stokes-Brinkman flow simulation shows that although some apparent-pore volumes are disconnected from each other due to limited resolution, fluid flow can be passed by the gray-pore region. Additionally, a modified hydraulic tortuosity model is proposed to evaluate the tortuosity of the ternary-phase domain because the conventional hydraulic tortuosity model for the binary-phase domain underestimates the tortuosity of the ternary-phase domain.
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