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DOI | 10.1029/2018WR024137 |
Pore-Senile Dissolution by CO2 Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity | |
Al-Khulaifi, Yousef1,2; Lin, Qingyang1; Blunt, Martin J.1,2; Bijeljic, Branko1,2 | |
2019-04-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:4页码:3171-3193 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | We study the impact of physical and chemical heterogeneity on reaction rates in multimineral porous media. We selected two pairs of carbonate samples of different physical heterogeneity in accordance with their initial computed velocity distributions and then injected CO2 saturated brine at reservoir conditions at two flow rates. We periodically imaged the samples using X-ray microtomography. The mineralogical composition was similar (a ratio of dolomite to calcite of 8:1), but the intrinsic reaction rates and mineral spatial distribution were profoundly different. Visualizations of velocity fields and reacted mineral distributions revealed that a dominant flow channel formed in all cases. The more physically homogeneous samples had a narrower velocity distribution and more preexisting fast channels, which promoted dominant channel formation in their proximity. In contrast, the heterogeneous samples exhibit a broader distribution of velocities and fewer fast channels, which accentuated nonuniform calcite distribution and favored calcite dissolution away from the initially fast pathways. We quantify the impact of physical and chemical heterogeneity by computing the proximity of reacted minerals to the fast flow pathways. The average reaction rates were an order of magnitude lower than the intrinsic ones due to mass transfer limitations. The effective reaction rate of calcite decreased by an order of magnitude, in both fast channels and slow regions. After channel formation calcite was shielded by dolomite whose effective rate in slow regions could even increase. Overall, the preferential channeling effect, as opposed to uniform dissolution, was promoted by a higher degree of physical and/or chemical heterogeneity. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000468597900033 |
WOS关键词 | REACTIVE TRANSPORT MODEL ; MINERAL DISSOLUTION ; CO2-INDUCED DISSOLUTION ; LIMESTONE DISSOLUTION ; CO2-SATURATED WATER ; WORMHOLE FORMATION ; REACTION-RATES ; FLOW ; PERMEABILITY ; SIMULATION |
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/182238 |
专题 | 资源环境科学 |
作者单位 | 1.Imperial Coll London, Dept Earth Sci & Engn, London, England; 2.Imperial Coll London, Qatar Carbonates & Carbon Storage Res Ctr, Dept Earth Sci & Engn, London, England |
推荐引用方式 GB/T 7714 | Al-Khulaifi, Yousef,Lin, Qingyang,Blunt, Martin J.,et al. Pore-Senile Dissolution by CO2 Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity[J]. WATER RESOURCES RESEARCH,2019,55(4):3171-3193. |
APA | Al-Khulaifi, Yousef,Lin, Qingyang,Blunt, Martin J.,&Bijeljic, Branko.(2019).Pore-Senile Dissolution by CO2 Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity.WATER RESOURCES RESEARCH,55(4),3171-3193. |
MLA | Al-Khulaifi, Yousef,et al."Pore-Senile Dissolution by CO2 Saturated Brine in a Multimineral Carbonate at Reservoir Conditions: Impact of Physical and Chemical Heterogeneity".WATER RESOURCES RESEARCH 55.4(2019):3171-3193. |
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