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Title: Nanoscale Chemical Processes Affecting Storage Capacities and Seals during Geologic CO 2 Sequestration

Abstract

Geologic CO 2 sequestration (GCS) is a promising strategy to mitigate anthropogenic CO 2 emission to the atmosphere. Suitable geologic storage sites should have a porous reservoir rock zone where injected CO 2 can displace brine and be stored in pores, and an impermeable zone on top of reservoir rocks to hinder upward movement of buoyant CO 2. The injection wells (steel casings encased in concrete) pass through these geologic zones and lead CO 2 to the desired zones. In subsurface environments, CO 2 is reactive as both a supercritical (sc) phase and aqueous (aq) species. Its nanoscale chemical reactions with geomedia and wellbores are closely related to the safety and efficiency of CO 2 storage. For example, the injection pressure is determined by the wettability and permeability of geomedia, which can be sensitive to nanoscale mineral-fluid interactions; the sealing safety of the injection sites is affected by the opening and closing of fractures in caprocks and the alteration of wellbore integrity caused by nanoscale chemical reactions; and the time scale for CO 2 mineralization is also largely dependent on the chemical reactivities of the reservoir rocks. Therefore, nanoscale chemical processes can influence the hydrogeological and mechanical properties of geomedia,more » such as their wettability, permeability, mechanical strength, and fracturing. This Account reviews our group’s work on nanoscale chemical reactions and their qualitative impacts on seal integrity and storage capacity at GCS sites from four points of view. First, studies on dissolution of feldspar, an important reservoir rock constituent, and subsequent secondary mineral precipitation are discussed, focusing on the effects of feldspar crystallography, cations, and sulfate anions. Second, interfacial reactions between caprock and brine are introduced using model clay minerals, with focuses on the effects of water chemistries (salinity and organic ligands) and water content on mineral dissolution and surface morphology changes. Third, the hydrogeological responses (using wettability alteration as an example) of clay minerals to chemical reactions are discussed, which connects the nanoscale findings to the transport and capillary trapping of CO 2 in the reservoirs. Fourth, the interplay between chemical and mechanical alterations of geomedia, using wellbore cement as a model geomedium, is examined, which provides helpful insights into wellbore and caprock integrities and CO 2 mineralization. Combining these four aspects, our group has answered questions related to nanoscale chemical reactions in subsurface GCS sites regarding the types of reactions and the property alterations of reservoirs and caprocks. Ultimately, the findings can shed light on the influences of nanoscale chemical reactions on storage capacities and seals during geologic CO 2 sequestration.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1]
  1. Department of Energy, Environmental and Chemical Engineering, Washington University, St. Louis, Missouri 63130, United States
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1368594
Alternate Identifier(s):
OSTI ID: 1508086
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Published Article
Journal Name:
Accounts of Chemical Research
Additional Journal Information:
Journal Name: Accounts of Chemical Research Journal Volume: 50 Journal Issue: 7; Journal ID: ISSN 0001-4842
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Jun, Young-Shin, Zhang, Lijie, Min, Yujia, and Li, Qingyun. Nanoscale Chemical Processes Affecting Storage Capacities and Seals during Geologic CO2 Sequestration. United States: N. p., 2017. Web. doi:10.1021/acs.accounts.6b00654.
Jun, Young-Shin, Zhang, Lijie, Min, Yujia, & Li, Qingyun. Nanoscale Chemical Processes Affecting Storage Capacities and Seals during Geologic CO2 Sequestration. United States. https://doi.org/10.1021/acs.accounts.6b00654
Jun, Young-Shin, Zhang, Lijie, Min, Yujia, and Li, Qingyun. Fri . "Nanoscale Chemical Processes Affecting Storage Capacities and Seals during Geologic CO2 Sequestration". United States. https://doi.org/10.1021/acs.accounts.6b00654.
@article{osti_1368594,
title = {Nanoscale Chemical Processes Affecting Storage Capacities and Seals during Geologic CO2 Sequestration},
author = {Jun, Young-Shin and Zhang, Lijie and Min, Yujia and Li, Qingyun},
abstractNote = {Geologic CO2 sequestration (GCS) is a promising strategy to mitigate anthropogenic CO2 emission to the atmosphere. Suitable geologic storage sites should have a porous reservoir rock zone where injected CO2 can displace brine and be stored in pores, and an impermeable zone on top of reservoir rocks to hinder upward movement of buoyant CO2. The injection wells (steel casings encased in concrete) pass through these geologic zones and lead CO2 to the desired zones. In subsurface environments, CO2 is reactive as both a supercritical (sc) phase and aqueous (aq) species. Its nanoscale chemical reactions with geomedia and wellbores are closely related to the safety and efficiency of CO2 storage. For example, the injection pressure is determined by the wettability and permeability of geomedia, which can be sensitive to nanoscale mineral-fluid interactions; the sealing safety of the injection sites is affected by the opening and closing of fractures in caprocks and the alteration of wellbore integrity caused by nanoscale chemical reactions; and the time scale for CO2 mineralization is also largely dependent on the chemical reactivities of the reservoir rocks. Therefore, nanoscale chemical processes can influence the hydrogeological and mechanical properties of geomedia, such as their wettability, permeability, mechanical strength, and fracturing. This Account reviews our group’s work on nanoscale chemical reactions and their qualitative impacts on seal integrity and storage capacity at GCS sites from four points of view. First, studies on dissolution of feldspar, an important reservoir rock constituent, and subsequent secondary mineral precipitation are discussed, focusing on the effects of feldspar crystallography, cations, and sulfate anions. Second, interfacial reactions between caprock and brine are introduced using model clay minerals, with focuses on the effects of water chemistries (salinity and organic ligands) and water content on mineral dissolution and surface morphology changes. Third, the hydrogeological responses (using wettability alteration as an example) of clay minerals to chemical reactions are discussed, which connects the nanoscale findings to the transport and capillary trapping of CO2 in the reservoirs. Fourth, the interplay between chemical and mechanical alterations of geomedia, using wellbore cement as a model geomedium, is examined, which provides helpful insights into wellbore and caprock integrities and CO2 mineralization. Combining these four aspects, our group has answered questions related to nanoscale chemical reactions in subsurface GCS sites regarding the types of reactions and the property alterations of reservoirs and caprocks. Ultimately, the findings can shed light on the influences of nanoscale chemical reactions on storage capacities and seals during geologic CO2 sequestration.},
doi = {10.1021/acs.accounts.6b00654},
url = {https://www.osti.gov/biblio/1368594}, journal = {Accounts of Chemical Research},
issn = {0001-4842},
number = 7,
volume = 50,
place = {United States},
year = {2017},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1021/acs.accounts.6b00654

Citation Metrics:
Cited by: 8 works
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Figures / Tables:

Figure 1 Figure 1: CO 2 trapping mechanisms at GCS sites.

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Works referencing / citing this record:

Effects of sulfate on biotite interfacial reactions under high temperature and high CO 2 pressure
journal, January 2019


    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.