CO2GeoNet Paper: Carbonation of borehole seals: Comparing evidence from short-term laboratory experiments and long-term natural analogues

It is crucial that the engineered seals of boreholes in the vicinity of a deep storage facility remain effective for considerable timescales if the long-term geological containment of stored CO2 is to be effective. These timescales extend beyond those achievable by laboratory experiments or industrial experience. Study of the carbonation of natural Ca silicate hydrate (CSH) phases provides a useful insight into the alteration processes and evolution of cement phases over long-timescales more comparable with those considered in performance assessments. Samples from two such natural analogues in Northern Ireland have been compared with samples from laboratory experiments on the carbonation of Portland cement. Samples showed similar carbonation reaction processes even though the natural and experimental samples underwent carbonation under very different conditions and timescales. These included conversion of the CSH phases to CaCO3 and SiO2, and the formation of a well-defined reaction front. In laboratory experiments the reaction front is associated with localised Ca migration, localised matrix porosity increase, and localised shrinkage of the cement matrix with concomitant cracking. Behind the reaction front is a zone of CaCO3 precipitation that partly seals porosity. A broader and more porous/permeable reaction zone was created in the laboratory experiments compared to the natural samples, and it is possible that short-term experiments might not fully replicate slower, longer-term processes. That the natural samples had only undergone limited carbonation, even though they had been exposed to atmospheric CO2 or dissolved View the MathML sourceHCO3- in groundwater for several thousands of years, may indicate that the limited amounts of carbonate mineral formation may have protected the CSH phases from further reaction. doi:10.1016/j.apgeochem.2012.09.007. http://www.sciencedirect.com/science/article/pii/S0883292712002594.
 
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Enquiries (British Geological Survey) (2013) . CO2GeoNet Paper: Carbonation of borehole seals: Comparing evidence from short-term laboratory experiments and long-term natural analogues. https://metadata.bgs.ac.uk/geonetwork/srv/api/records/1c7dd865-4fa0-2499-e054-002128a47908

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Date ( Publication )
2013-03
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http://data.bgs.ac.uk/id/dataHolding/13606778

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GEMET - INSPIRE themes
  • Geology
BGS Thesaurus of Geosciences
  • Carbon capture and storage
Keywords
  • NERC_DDC
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The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
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English English
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OnLine resource
http://www.sciencedirect.com/science/article/pii/S0883292712002594  
OnLine resource
http://www.bgs.ac.uk/ukccs/accessions/index.html#item77855  
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nonGeographicDataset Non geographic dataset
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non geographic dataset

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Date ( Publication )
2011
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See the referenced specification
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Conformance result

Date ( Publication )
2010-12-08
Explanation
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
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false
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CO2GeoNet was originally launched under the European Commission's 6th Framework Programme as a Network of Excellence (2004-2009) to promote research integration within the scientific community to help enable the implementation of CO2 geological storage. It was launched a non-profit scientific Association in 2008 registered under French Law so as to continue the networking accomplished under the European Commission's contract.

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1c7dd865-4fa0-2499-e054-002128a47908   XML
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English English
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nonGeographicDataset Non geographic dataset
Hierarchy level name
non geographic dataset
Date stamp
2021-04-16
Metadata standard version
2.3

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