Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020829 |
Capillary trapping quantification in sandstones using NMR relaxometry | |
Connolly, Paul R. J.1; Vogt, Sarah J.1; Iglauer, Stefan2; May, Eric F.1; Johns, Michael L.1 | |
2017-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | Capillary trapping of a non-wetting phase arising from two-phase immiscible flow in sedimentary rocks is critical to many geoscience scenarios, including oil and gas recovery, aquifer recharge and, with increasing interest, carbon sequestration. Here we demonstrate the successful use of low field H-1 Nuclear Magnetic Resonance [NMR] to quantify capillary trapping; specifically we use transverse relaxation time [T-2] time measurements to measure both residual water [wetting phase] content and the surface-to-volume ratio distribution (which is proportional to pore size] of the void space occupied by this residual water. Critically we systematically confirm this relationship between T-2 and pore size by quantifying inter-pore magnetic field gradients due to magnetic susceptibility contrast, and demonstrate that our measurements at all water saturations are unaffected. Diffusion in such field gradients can potentially severely distort the T-2-pore size relationship, rendering it unusable. Measurements are performed for nitrogen injection into a range of water-saturated sandstone plugs at reservoir conditions. Consistent with a water-wet system, water was preferentially displaced from larger pores while relatively little change was observed in the water occupying smaller pore spaces. The impact of cyclic wetting/non-wetting fluid injection was explored and indicated that such a regime increased non-wetting trapping efficiency by the sequential occupation of the most available larger pores by nitrogen. Finally the replacement of nitrogen by CO2 was considered; this revealed that dissolution of paramagnetic minerals from the sandstone caused by its exposure to carbonic acid reduced the in situ bulk fluid T-2 relaxation time on a timescale comparable to our core flooding experiments. The implications of this for the T-2-pore size relationship are discussed. |
英文关键词 | carbon sequestration capillary trapping NMR relaxation |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413484200024 |
WOS关键词 | RELATIVE PERMEABILITY HYSTERESIS ; SUPERCRITICAL CARBON-DIOXIDE ; POROUS-MEDIA ; BEREA SANDSTONE ; CO2 WETTABILITY ; FLOW BEHAVIOR ; WATER ; RELAXATION ; SEQUESTRATION ; DISTRIBUTIONS |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21578 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Western Australia, Sch Mech & Chem Engn, Fluid Sci & Resources Div, Crawley, NSW, Australia; 2.Curtin Univ, Dept Petr Engn, Kensington, NSW, Australia |
推荐引用方式 GB/T 7714 | Connolly, Paul R. J.,Vogt, Sarah J.,Iglauer, Stefan,et al. Capillary trapping quantification in sandstones using NMR relaxometry[J]. WATER RESOURCES RESEARCH,2017,53(9). |
APA | Connolly, Paul R. J.,Vogt, Sarah J.,Iglauer, Stefan,May, Eric F.,&Johns, Michael L..(2017).Capillary trapping quantification in sandstones using NMR relaxometry.WATER RESOURCES RESEARCH,53(9). |
MLA | Connolly, Paul R. J.,et al."Capillary trapping quantification in sandstones using NMR relaxometry".WATER RESOURCES RESEARCH 53.9(2017). |
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