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Title: Effect of CO2-brine-rock reactions on pore architecture and permeability in dolostone: Implications for CO2 storage and EOR

Abstract

Geologic carbon sequestration (GCS) is considered a feasible technology for storing substantive volumes of greenhouse gases in subsurface geological formations. In the reservoir, far from carbon dioxide (CO2) injection wells or in post-injection scenarios, diffusion dominates over advection. This condition conjoins with spatially distributed geochemical reactions to induce heterogeneous changes in pore architecture, i.e. pore body and throat sizes or surface roughness. These changes can affect CO2 transport properties and storage capacity. In this work, we investigated mineral dissolution and precipitation in dolomite samples saturated with a CO2-saturated brine at 93 °C and 34.5 MPa, aged without flow. Two rock types samples, i.e. intergranular- and vuggy-dominant, were selected to investigate changes in pore size, porosity and permeability under reactive conditions. Mineral dissolution and precipitation were characterized using scanning electron microscopy. Changes in pore size were quantified via time-domain nuclear magnetic resonance (TD-NMR) transverse relaxation time (T2) and diffusion coefficient (D) distributions. We show that mineral dissolution likely occurs in highly permeable pathways. These observations are confirmed through analysis of (T2) and diffusion coefficient (D) distributions. In contrast to results during CO2-enriched brine continuous injection, mineral precipitation was observed in micropores. The leftward shift of the T2 peaks, corresponding to micropores,more » also evidenced mineral precipitation in lowpermeability zones. However, microscale alterations resulted only in a subtle increase in porosity and permeability. Results in this study shed light on effects of geochemical reactions on alteration of rock properties in diffusion-dominated regions during CO2 storage.« less

Authors:
ORCiD logo [1];  [2];  [1];  [1];  [2];  [2];  [3];  [2]
+ Show Author Affiliations
  1. Univ. of Wyoming, Laramie, WY (United States). Center for Economic Geology Research
  2. Univ. of Wyoming, Laramie, WY (United States)
  3. Wyoming State Geological Survey, Laramie, WY (United States)
Publication Date:
Research Org.:
Univ. of Wyoming, Laramie, WY (United States). Center for Economic Geology Research
Sponsoring Org.:
USDOE
OSTI Identifier:
1779848
Alternate Identifier(s):
OSTI ID: 1781275
Grant/Contract Number:  
FE0031624
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Journal Volume: 107; Journal ID: ISSN 1750-5836
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; CO2 storage; heterogeneous chemical reactions; pore structure change; porosity and permeability change; NMR t2 and diffusion

Citation Formats

Wang, Heng, Alvarado, Vladimir, Bagdonas, Davin A., McLaughlin, J. Fred, Kaszuba, John P., Grana, Dario, Campbell, Erin, and Ng, Kam. Effect of CO2-brine-rock reactions on pore architecture and permeability in dolostone: Implications for CO2 storage and EOR. United States: N. p., 2021. Web. doi:10.1016/j.ijggc.2021.103283.
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Wang, Heng, Alvarado, Vladimir, Bagdonas, Davin A., McLaughlin, J. Fred, Kaszuba, John P., Grana, Dario, Campbell, Erin, & Ng, Kam. Effect of CO2-brine-rock reactions on pore architecture and permeability in dolostone: Implications for CO2 storage and EOR. United States. https://doi.org/10.1016/j.ijggc.2021.103283
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Wang, Heng, Alvarado, Vladimir, Bagdonas, Davin A., McLaughlin, J. Fred, Kaszuba, John P., Grana, Dario, Campbell, Erin, and Ng, Kam. Sat . "Effect of CO2-brine-rock reactions on pore architecture and permeability in dolostone: Implications for CO2 storage and EOR". United States. https://doi.org/10.1016/j.ijggc.2021.103283. https://www.osti.gov/servlets/purl/1779848.
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@article{osti_1779848,
title = {Effect of CO2-brine-rock reactions on pore architecture and permeability in dolostone: Implications for CO2 storage and EOR},
author = {Wang, Heng and Alvarado, Vladimir and Bagdonas, Davin A. and McLaughlin, J. Fred and Kaszuba, John P. and Grana, Dario and Campbell, Erin and Ng, Kam},
abstractNote = {Geologic carbon sequestration (GCS) is considered a feasible technology for storing substantive volumes of greenhouse gases in subsurface geological formations. In the reservoir, far from carbon dioxide (CO2) injection wells or in post-injection scenarios, diffusion dominates over advection. This condition conjoins with spatially distributed geochemical reactions to induce heterogeneous changes in pore architecture, i.e. pore body and throat sizes or surface roughness. These changes can affect CO2 transport properties and storage capacity. In this work, we investigated mineral dissolution and precipitation in dolomite samples saturated with a CO2-saturated brine at 93 °C and 34.5 MPa, aged without flow. Two rock types samples, i.e. intergranular- and vuggy-dominant, were selected to investigate changes in pore size, porosity and permeability under reactive conditions. Mineral dissolution and precipitation were characterized using scanning electron microscopy. Changes in pore size were quantified via time-domain nuclear magnetic resonance (TD-NMR) transverse relaxation time (T2) and diffusion coefficient (D) distributions. We show that mineral dissolution likely occurs in highly permeable pathways. These observations are confirmed through analysis of (T2) and diffusion coefficient (D) distributions. In contrast to results during CO2-enriched brine continuous injection, mineral precipitation was observed in micropores. The leftward shift of the T2 peaks, corresponding to micropores, also evidenced mineral precipitation in lowpermeability zones. However, microscale alterations resulted only in a subtle increase in porosity and permeability. Results in this study shed light on effects of geochemical reactions on alteration of rock properties in diffusion-dominated regions during CO2 storage.},
doi = {10.1016/j.ijggc.2021.103283},
journal = {International Journal of Greenhouse Gas Control},
number = ,
volume = 107,
place = {United States},
year = {Sat May 01 00:00:00 EDT 2021},
month = {Sat May 01 00:00:00 EDT 2021}
}
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https://doi.org/10.1016/j.ijggc.2021.103283
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