Potential CO 2 intrusion in near-surface environments: a review of current research approaches to geochemical processes

Zahra Derakhshan-Nejad, Jing Sun, Seong Taek Yun, Giehyeon Lee

Research output: Contribution to journalReview articlepeer-review

5 Citations (Scopus)

Abstract

Abstract: Carbon dioxide (CO 2 ) capture and storage (CCS) plays a crucial role in reducing carbon emissions to the atmosphere. However, gas leakage from deep storage reservoirs, which may flow back into near-surface and eventually to the atmosphere, is a major concern associated with this technology. Despite an increase in research focusing on potential CO 2 leakage into deep surface features and aquifers, a significant knowledge gap remains in the geochemical changes associated with near-surface. This study reviews the geochemical processes related to the intrusion of CO 2 into near-surface environments with an emphasis on metal mobilization and discusses about the geochemical research approaches, recent findings, and current knowledge gaps. It is found that the intrusion of CO 2 (g) into near-surface likely induces changes in pH, dissolution of minerals, and potential degradation of surrounding environments. The development of adequate geochemical research approaches for assessing CO 2 leakage in near-surface environments, using field studies, laboratory experiments, and/or geochemical modeling combined with isotopic tracers, has promoted extensive surveys of CO 2 -induced reactions. However, addressing knowledge gaps in geochemical changes in near-surface environments is fundamental to advance current knowledge on how CO 2 leaks from storage sites and the consequences of this process on soil and water chemistry. For reliable detection and risk management of the potential impact of CO 2 leakage from storage sites on the environmental chemistry, currently available geochemical research approaches should be either combined or used independently (albeit in a manner complementarily to one another), and the results should be jointly interpreted. Graphical abstract: [Figure not available: see fulltext.].

Original languageEnglish
JournalEnvironmental Geochemistry and Health
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • CO capture and storage (CCS)
  • CO leakage
  • CO sequestration
  • CO -induced geochemical processes
  • Near-surface environment

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Water Science and Technology
  • Environmental Science(all)
  • Geochemistry and Petrology

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