Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers
Interactions between injected CO2, brine, and rock during CO2 sequestration in deep saline aquifers alter their natural hydro-mechanical properties, affecting the safety, and efficiency of the sequestration process. This study aims to identify such interaction-induced mineralogical changes in aquife...
Published in: | Scientific Reports |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
NATURE PUBLISHING GROUP
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/11343/123812 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368350800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=d4d813f4571fa7d6246bdc0dfeca3a1c https://doi.org/10.1038/srep19362 |
id |
ftumelbourne:oai:jupiter.its.unimelb.edu.au:11343/123812 |
---|---|
record_format |
openpolar |
spelling |
ftumelbourne:oai:jupiter.its.unimelb.edu.au:11343/123812 2023-05-15T15:52:46+02:00 Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers Rathnaweera, TD Ranjith, PG Perera, MSA 2016-01-20 http://hdl.handle.net/11343/123812 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368350800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=d4d813f4571fa7d6246bdc0dfeca3a1c https://doi.org/10.1038/srep19362 English eng NATURE PUBLISHING GROUP doi:10.1038/srep19362 issn:2045-2322 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368350800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=d4d813f4571fa7d6246bdc0dfeca3a1c ARTN 19362 Rathnaweera, TD; Ranjith, PG; Perera, MSA, Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers, SCIENTIFIC REPORTS, 2016, 6 2045-2322 http://hdl.handle.net/11343/123812 Journal Article 2016 ftumelbourne https://doi.org/10.1038/srep19362 2019-10-15T12:18:48Z Interactions between injected CO2, brine, and rock during CO2 sequestration in deep saline aquifers alter their natural hydro-mechanical properties, affecting the safety, and efficiency of the sequestration process. This study aims to identify such interaction-induced mineralogical changes in aquifers, and in particular their impact on the reservoir rock's flow characteristics. Sandstone samples were first exposed for 1.5 years to a mixture of brine and super-critical CO2 (scCO2), then tested to determine their altered geochemical and mineralogical properties. Changes caused uniquely by CO2 were identified by comparison with samples exposed over a similar period to either plain brine or brine saturated with N2. The results show that long-term reaction with CO2 causes a significant pH drop in the saline pore fluid, clearly due to carbonic acid (as dissolved CO2) in the brine. Free H(+) ions released into the pore fluid alter the mineralogical structure of the rock formation, through the dissolution of minerals such as calcite, siderite, barite, and quartz. Long-term CO2 injection also creates a significant CO2 drying-out effect and crystals of salt (NaCl) precipitate in the system, further changing the pore structure. Such mineralogical alterations significantly affect the saline aquifer's permeability, with important practical consequences for the sequestration process. Article in Journal/Newspaper Carbonic acid The University of Melbourne: Digital Repository Scientific Reports 6 1 |
institution |
Open Polar |
collection |
The University of Melbourne: Digital Repository |
op_collection_id |
ftumelbourne |
language |
English |
description |
Interactions between injected CO2, brine, and rock during CO2 sequestration in deep saline aquifers alter their natural hydro-mechanical properties, affecting the safety, and efficiency of the sequestration process. This study aims to identify such interaction-induced mineralogical changes in aquifers, and in particular their impact on the reservoir rock's flow characteristics. Sandstone samples were first exposed for 1.5 years to a mixture of brine and super-critical CO2 (scCO2), then tested to determine their altered geochemical and mineralogical properties. Changes caused uniquely by CO2 were identified by comparison with samples exposed over a similar period to either plain brine or brine saturated with N2. The results show that long-term reaction with CO2 causes a significant pH drop in the saline pore fluid, clearly due to carbonic acid (as dissolved CO2) in the brine. Free H(+) ions released into the pore fluid alter the mineralogical structure of the rock formation, through the dissolution of minerals such as calcite, siderite, barite, and quartz. Long-term CO2 injection also creates a significant CO2 drying-out effect and crystals of salt (NaCl) precipitate in the system, further changing the pore structure. Such mineralogical alterations significantly affect the saline aquifer's permeability, with important practical consequences for the sequestration process. |
format |
Article in Journal/Newspaper |
author |
Rathnaweera, TD Ranjith, PG Perera, MSA |
spellingShingle |
Rathnaweera, TD Ranjith, PG Perera, MSA Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers |
author_facet |
Rathnaweera, TD Ranjith, PG Perera, MSA |
author_sort |
Rathnaweera, TD |
title |
Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers |
title_short |
Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers |
title_full |
Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers |
title_fullStr |
Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers |
title_full_unstemmed |
Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers |
title_sort |
experimental investigation of geochemical and mineralogical effects of co2 sequestration on flow characteristics of reservoir rock in deep saline aquifers |
publisher |
NATURE PUBLISHING GROUP |
publishDate |
2016 |
url |
http://hdl.handle.net/11343/123812 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368350800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=d4d813f4571fa7d6246bdc0dfeca3a1c https://doi.org/10.1038/srep19362 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
doi:10.1038/srep19362 issn:2045-2322 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368350800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=d4d813f4571fa7d6246bdc0dfeca3a1c ARTN 19362 Rathnaweera, TD; Ranjith, PG; Perera, MSA, Experimental investigation of geochemical and mineralogical effects of CO2 sequestration on flow characteristics of reservoir rock in deep saline aquifers, SCIENTIFIC REPORTS, 2016, 6 2045-2322 http://hdl.handle.net/11343/123812 |
op_doi |
https://doi.org/10.1038/srep19362 |
container_title |
Scientific Reports |
container_volume |
6 |
container_issue |
1 |
_version_ |
1766387868209512448 |