CO2 sequestration by magnesite mineralisation through interaction of Mg-brine and CO2: integrated laboratory experiments and computerised geochemical modelling. Issue 3 (3rd May 2020)

• Record Type: Journal Article
• Authors: Klunk, Marcos Antônio; Shah, Zeban; Caetano, Nattan Roberto; Conceição, Rommulo Vieira; Wander, Paulo Roberto; Dasgupta, Sudipta; Das, Mohuli
• Is Part Of: International journal of environmental studies. Volume 77:Issue 3(2020)
• Page Start: 492
• Page End: 509
• Publication Date: 2020-05-03
• Subjects: Mineral carbonation -- magnesite -- geochemical modelling -- bischofite; Environmental policy -- Periodicals; Environmental sciences -- Periodicals; 333.707
• DOI: 10.1080/00207233.2019.1675295
• Languages: English
• ISSNs: 0020-7233

Abstract

ABSTRACT: Several Carbon Capture and Storage (CCS) techniques have been studied including injections of carbon dioxide (CO2 ) into the mature and/or depleted hydrocarbon reservoirs and deep saline aquifers. This work aims to test storing CO2 into the magnesium-rich evaporite strata and also into the stratigraphic intervals containing Mg-rich brines. The test simulates Mg-carbonation of the synthetic solution obtained from the Mg-evaporite mineral, bischofite – both experimentally in the laboratory condition and also through computerised geochemical simulation. The laboratory experiments, which resulted in the crystallisation of anhydrous magnesite, were analysed. The TOUGHREACT TM, Geochemist's Workbench TM (GWB) and PHREEQC TM software simulated the experiments as computerised geochemical model and tested the results for natural geological conditions. The geochemical simulations successfully demonstrate the immense CCS potential for the Mg-evaporite (as well as the sedimentary strata charged with Mg-evaporitic brine) at their subsurface geological occurrences at elevated pressure-temperature and high salinity.