The relevance of dawsonite precipitation in CO2 sequestration in the Mihályi-Répcelak area, NW Hungary

Király, Csilla and Sendula, Eszter and Szamosfalvi, Ágnes and Káldos, Réka and Kónya, Péter and Kovács, István János and Füri, Judit and Bendő, Zsolt and Falus, György (2015) The relevance of dawsonite precipitation in CO2 sequestration in the Mihályi-Répcelak area, NW Hungary. Geological Society Special Publications. ISSN 0305-8719 (Submitted)

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Abstract

A natural CO2 reservoir system with sandstone lithology has been studied in NW Hungary due to similarities with a large saline reservoir formation widespread in the whole of the Pannonian Basin (Central Europe), suggested to be one of the best candidates for industrial CO2 storage. A range of analytical techniques has been used on core samples from the CO2-containing sandstone layers representing a wide pressure (90-155 bar), temperature (79-95°C) and pore fluid composition range (TDS between 18 000 – 50 700 mg/l) to identify the mineralogy and textural characteristics of the natural reservoir. The only clear CO2-related feature in the studied lithology was the occurrence of dawsonite (NaAlCO3(OH)2) always in close textural relation with albite. This is in clear agreement with our geochemical modelling results, which also underline the presence of albite as a precondition for the crystallization of dawsonite at the given p-T-X conditions. Our results suggest that, at least in the Pannonian Basin, dawsonite may be an important mineral to safely sequester industrial CO2 in the subsurface.

Item Type:	Article
Subjects:	Q Science / természettudomány > QD Chemistry / kémia > QD06 Mineralogy / ásványtan Q Science / természettudomány > QE Geology / földtudományok > QE01 Geophysics / geofizika Q Science / természettudomány > QE Geology / földtudományok > QE02 Geochemistry / geokémia
Depositing User:	Dr. István János Kovács
Date Deposited:	02 Oct 2015 11:09
Last Modified:	02 Oct 2015 11:09
URI:	http://real.mtak.hu/id/eprint/29456

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• The relevance of dawsonite precipitation in CO2 sequestration in the Mihályi-Répcelak area, NW Hungary. (deposited 02 Oct 2015 11:09) [Currently Displayed]
  • The relevance of dawsonite precipitation in CO2 sequestration in the Mihályi-Répcelak area, NW Hungary. (deposited 03 Oct 2016 18:31)

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