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Title: Solute mixing regulates heterogeneity of mineral precipitation in porous media

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2017GL073999· OSTI ID:1473894
 [1];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Civil and Environmental Engineering
  2. Hong Kong Univ. of Science and Technology (HKUST), Shenzhen (China). Marine Environmental Lab. and Shenzhen Research Inst.

Here, synchrotron X-ray microtomography was used to track the spatiotemporal evolution of mineral precipitation and the consequent alteration of the pore structure. Column experiments were conducted by injecting CaCl2 and NaHCO3 solutions into granular porous media either as a premixed supersaturated solution (external mixing) or as separate solutions that mixed within the specimen (internal mixing). The two mixing modes produced distinct mineral growth patterns. While internal mixing promoted transverse heterogeneity with precipitation at the mixing zone, external mixing favored relatively homogeneous precipitation along the flow direction. The impact of precipitation on pore water flow and permeability was assessed via 3-D flow simulations, which indicated anisotropic permeability evolution for both mixing modes. Under both mixing modes, precipitation decreased the median pore size and increased the skewness of the pore size distribution. Such similar pore-scale evolution patterns suggest that the clogging of individual pores depends primarily on local supersaturation state and pore geometry.

Research Organization:
Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
FG02-94ER14466; CMMI‐1351534; EAR‐1128799; AC02‐06CH11357
OSTI ID:
1473894
Alternate ID(s):
OSTI ID: 1390368
Journal Information:
Geophysical Research Letters, Vol. 44, Issue 13; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (3)

Geoelectrical Signatures of Reactive Mixing: A Theoretical Assessment journal April 2018
Influence of mineralization and injection flow rate on flow patterns in three-dimensional porous media journal January 2019
Influence of mineralization and injection flow rate on flow patterns in three-dimensional porous media text January 2019

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