Abstract

In a CO2 storage site, carbonate rocks might be good reservoir rocks or good seals depending on their porosity and permeability. However, these properties may change in time due to deformation processes related to CO2 injections and/or withdraws. In this pilot study, we investigate at the laboratory scale the influence of CO2-induced geochemical reactions on the mechanical integrity of carbonate rocks. To achieve this target, we have performed an experimental HP-HT test on brine saturated oolitic limestone samples that were exposed to 230 bar CO2 pressure and 37.5oC reaction temperature (supercritical conditions) for a period of 2 weeks. Although changes in fluid chemistry have been identified via ICP-OES analysis, we have observed no particular differences in terms of ooids and cement deformation and/or calcite dissolution when comparing ESEM images of pre- and post-treatment samples. We are currently performing more experiments under different conditions (particularly longer exposure and higher brine-rock ratios that can be linked to higher dissolution of calcite) in order to better understand the dominant CO2 sequestration mechanisms in oolitic limestone-containing reservoirs.

LanguageEnglish
Pages3150-3156
Number of pages7
JournalEnergy Procedia
Volume114
DOIs
Publication statusPublished - Jul 2017

Fingerprint

Carbonates
Rocks
Calcite
Limestone
Dissolution
Seals
Cements
Porosity
Fluids
Experiments
Temperature

Keywords

  • brine
  • CO
  • high pressure-high temperature tests
  • limestone
  • mechanical integrity

ASJC Scopus subject areas

  • Energy(all)

Cite this

@article{f56bfedf54004b1690cbe74170be703b,
title = "Impact of CO2-induced Geochemical Reactions on the Mechanical Integrity of Carbonate Rocks",
abstract = "In a CO2 storage site, carbonate rocks might be good reservoir rocks or good seals depending on their porosity and permeability. However, these properties may change in time due to deformation processes related to CO2 injections and/or withdraws. In this pilot study, we investigate at the laboratory scale the influence of CO2-induced geochemical reactions on the mechanical integrity of carbonate rocks. To achieve this target, we have performed an experimental HP-HT test on brine saturated oolitic limestone samples that were exposed to 230 bar CO2 pressure and 37.5oC reaction temperature (supercritical conditions) for a period of 2 weeks. Although changes in fluid chemistry have been identified via ICP-OES analysis, we have observed no particular differences in terms of ooids and cement deformation and/or calcite dissolution when comparing ESEM images of pre- and post-treatment samples. We are currently performing more experiments under different conditions (particularly longer exposure and higher brine-rock ratios that can be linked to higher dissolution of calcite) in order to better understand the dominant CO2 sequestration mechanisms in oolitic limestone-containing reservoirs.",
keywords = "brine, CO, high pressure-high temperature tests, limestone, mechanical integrity",
author = "Charalampidou, {E. M.} and S. Garcia and J. Buckman and P. Cordoba and H. Lewis and M. Maroto-Valer",
year = "2017",
month = "7",
doi = "10.1016/j.egypro.2017.03.1443",
language = "English",
volume = "114",
pages = "3150--3156",
journal = "Energy Procedia",
issn = "1876-6102",
publisher = "Elsevier",

}

TY - JOUR

T1 - Impact of CO2-induced Geochemical Reactions on the Mechanical Integrity of Carbonate Rocks

AU - Charalampidou, E. M.

AU - Garcia, S.

AU - Buckman, J.

AU - Cordoba, P.

AU - Lewis, H.

AU - Maroto-Valer, M.

PY - 2017/7

Y1 - 2017/7

N2 - In a CO2 storage site, carbonate rocks might be good reservoir rocks or good seals depending on their porosity and permeability. However, these properties may change in time due to deformation processes related to CO2 injections and/or withdraws. In this pilot study, we investigate at the laboratory scale the influence of CO2-induced geochemical reactions on the mechanical integrity of carbonate rocks. To achieve this target, we have performed an experimental HP-HT test on brine saturated oolitic limestone samples that were exposed to 230 bar CO2 pressure and 37.5oC reaction temperature (supercritical conditions) for a period of 2 weeks. Although changes in fluid chemistry have been identified via ICP-OES analysis, we have observed no particular differences in terms of ooids and cement deformation and/or calcite dissolution when comparing ESEM images of pre- and post-treatment samples. We are currently performing more experiments under different conditions (particularly longer exposure and higher brine-rock ratios that can be linked to higher dissolution of calcite) in order to better understand the dominant CO2 sequestration mechanisms in oolitic limestone-containing reservoirs.

AB - In a CO2 storage site, carbonate rocks might be good reservoir rocks or good seals depending on their porosity and permeability. However, these properties may change in time due to deformation processes related to CO2 injections and/or withdraws. In this pilot study, we investigate at the laboratory scale the influence of CO2-induced geochemical reactions on the mechanical integrity of carbonate rocks. To achieve this target, we have performed an experimental HP-HT test on brine saturated oolitic limestone samples that were exposed to 230 bar CO2 pressure and 37.5oC reaction temperature (supercritical conditions) for a period of 2 weeks. Although changes in fluid chemistry have been identified via ICP-OES analysis, we have observed no particular differences in terms of ooids and cement deformation and/or calcite dissolution when comparing ESEM images of pre- and post-treatment samples. We are currently performing more experiments under different conditions (particularly longer exposure and higher brine-rock ratios that can be linked to higher dissolution of calcite) in order to better understand the dominant CO2 sequestration mechanisms in oolitic limestone-containing reservoirs.

KW - brine

KW - CO

KW - high pressure-high temperature tests

KW - limestone

KW - mechanical integrity

UR - http://www.scopus.com/inward/record.url?scp=85029657318&partnerID=8YFLogxK

U2 - 10.1016/j.egypro.2017.03.1443

DO - 10.1016/j.egypro.2017.03.1443

M3 - Article

VL - 114

SP - 3150

EP - 3156

JO - Energy Procedia

T2 - Energy Procedia

JF - Energy Procedia

SN - 1876-6102

ER -