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DOI10.1029/2019WR026294
Capillary Trapping of CO2 in Sandstone Using Low Field NMR Relaxometry
Connolly, Paul R. J.1; Vogt, Sarah J.1; Mahmoud, Mohamed2; Ng, Christopher N. Y.1; May, Eric F.1; Johns, Michael L.1
2019-12-10
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2019
卷号55期号:12页码:10466-10478
文章类型Article
语种英语
国家Australia; Saudi Arabia
英文摘要

Injecting carbon dioxide into geological formations for long-term storage is considered integral to reducing greenhouse gas emissions. Residual trapping of CO2 is a primary storage mechanism, whereby CO2 ganglia are trapped in the pore space by capillary forces. Experimental knowledge of residual trapping processes in rocks is critical to the development of safe storage strategies. Here we present a quantitative low field H-1 nuclear magnetic resonance (NMR) core flooding study of CO2 residual trapping in three different sandstones. It was found that transverse relaxation (T-2) measurements were sensitive to the dissolution of paramagnetic ions from rock matrix minerals after exposure to carbonic acid; this response was observed on time scales relevant to core flooding experiments (i.e., minutes to hours). Subsequently, a brine aging protocol was designed and implemented to minimize this chemical effect, and hence, by applying the well-known T-2-pore size relationship, changes in T-2 time distributions during core flooding could be related to displacement of brine from pores of different sizes. Comparison of T-2 distributions for partially CO2/brine-saturated cores to previously published data for N-2/H2O systems shows an increased displacement of brine from small pores by CO2. Furthermore, results from cyclical brine/CO2 injections showed an increase in the total volume of residually trapped CO2 and an increase in trapping efficiency; compared to the results observed for N-2/H2O, however, the improvement in trapping efficiency with cyclic injection was less pronounced. Potential causes for the observed differences are discussed in the context of effective N-2 and CO2 wetting.


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:000501669200001
WOS关键词RELATIVE PERMEABILITY ; SUPERCRITICAL CO2 ; CARBON-DIOXIDE ; RELAXATION ; WATER ; SIMULATION ; SEQUESTRATION ; EQUATIONS ; STORAGE ; FLUIDS
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
被引频次:17[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/223967
专题资源环境科学
作者单位1.Univ Western Australia, Fac Engn & Math Sci, Dept Chem Engn, M050, Crawley, WA, Australia;
2.King Fahd Univ Petr & Minerals, Coll Petr Engn & Geosci, Petr Engn Dept, Dhahran, Saudi Arabia
推荐引用方式
GB/T 7714
Connolly, Paul R. J.,Vogt, Sarah J.,Mahmoud, Mohamed,et al. Capillary Trapping of CO2 in Sandstone Using Low Field NMR Relaxometry[J]. WATER RESOURCES RESEARCH,2019,55(12):10466-10478.
APA Connolly, Paul R. J.,Vogt, Sarah J.,Mahmoud, Mohamed,Ng, Christopher N. Y.,May, Eric F.,&Johns, Michael L..(2019).Capillary Trapping of CO2 in Sandstone Using Low Field NMR Relaxometry.WATER RESOURCES RESEARCH,55(12),10466-10478.
MLA Connolly, Paul R. J.,et al."Capillary Trapping of CO2 in Sandstone Using Low Field NMR Relaxometry".WATER RESOURCES RESEARCH 55.12(2019):10466-10478.
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