Observations of 3-D transverse dispersion and dilution in natural consolidated rock by X-ray tomography

被引：20
作者：
Boon, Maartje [1 ,2 ]
Bijeljic, Branko [1 ,2 ]
Niu, Ben [1 ,2 ]
Krevor, Sam [1 ,2 ]
机构：
[1] Imperial Coll London, Dept Earth Sci & Engn, South Kensington Campus, London SW7 2AZ, England
[2] Imperial Coll London, Qatar Carbonates & Carbon Storage Res Ctr, London, England
来源：
ADVANCES IN WATER RESOURCES | 2016年 / 96卷
关键词：
Solute transport; Transverse dispersion; Dilution index; Reactor ratio; Rock heterogeneity; X-Ray tomography; LATERAL DISPERSION; POROUS-MEDIA; PACKED-BEDS; GROUNDWATER; COEFFICIENTS; DISSOLUTION; STORAGE;
D O I：
10.1016/j.advwatres.2016.07.020
中图分类号：
TV21 [水资源调查与水利规划];
学科分类号：
081501 ;
摘要：
Recent studies have demonstrated the importance of transverse dispersion for dilution and mixing of solutes but most observations have remained limited to two-dimensional sand-box models. We present a new core-flood test to characterize solute transport in 3-D natural-rock media. A device consisting of three annular regions was used for fluid injection into a cylindrical rock core. Pure water was injected into the center and outer region and a Nal solution into the middle region. Steady state transverse dispersion of Nal was visualized with an X-ray medical CT-scanner for a range of Peclet numbers. Three methods were used to calculate D-t: (1) fitting an analytical solution, (2) analyzing the second-central moment, and (3) analyzing the dilution index and reactor ratio. Transverse dispersion decreased with distance due to flow focusing. Furthermore, D-t in the power-law regime showed sub-linear behavior. Overall, the reactor ratios were high confirming the homogeneity of Berea sandstone. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：266 / 281
页数：16
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