Gilfillan, Stuart

Haszeldine, R. Stuart

Nelson, Stephen

Poreda, Robert

Wilkinson, Mark

English

Edinburgh Research Explorer

     Edinburgh Research Explorer                                      He and Ne as tracers of natural CO2 migration from a deepreservoirCitation for published version:Gilfillan, S, Wilkinson, M, Haszeldine, RS, Nelson, S & Poreda, R 2010, 'He and Ne as tracers of naturalCO2 migration from a deep reservoir' Geochimica et Cosmochimica Acta, vol 74, no. 12, pp. A331-A331.Link:Link to publication record in Edinburgh Research ExplorerDocument Version:Author final version (often known as postprint)Published In:Geochimica et Cosmochimica ActaPublisher Rights Statement:This is the author’s version of a work that was accepted for publication. A definitive version was subsequentlypublished in Geochimica et Cosmochimica Acta (2010)General rightsCopyright for the publications made accessible via the Edinburgh Research Explorer is retained by the author(s)and / or other copyright owners and it is a condition of accessing these publications that users recognise andabide by the legal requirements associated with these rights.Take down policyThe University of Edinburgh has made every reasonable effort to ensure that Edinburgh Research Explorercontent complies with UK legislation. If you believe that the public display of this file breaches copyright pleasecontact openaccess@ed.ac.uk providing details, and we will remove access to the work immediately andinvestigate your claim.Download date: 20. Feb. 2015      He and Ne as tracers of natural CO2 migration from a deep reservoir (Abstract) Stuart M. V. Gilfillan* Mark Wilkinson, R. Stuart Haszeldine,  Steven T. Nelson, and Robert J. Poreda *Author to whom correspondence should be addressed:  Scottish Carbon Capture and Storage,  School of GeoSciences, The University of Edinburgh,  Grant Institute,  The King's Buildings,  West Mains Road,  Edinburgh, EH9 3JW   Email: stuart.gilfillan@ed.ac.uk      This is the author final draft or ‘post-print’ version made available through Edinburgh Research Explorer. The final version was published in Geochimica et Cosmochimica Acta copyright of Elsevier (2010) available online. Cite As: Gilfillan, S, Wilkinson, M, Haszeldine, RS, Nelson, S & Poreda, R 2010, 'He and Ne as tracers of natural CO2 migration from a deep reservoir’ Geochimica et Cosmochimica Acta, vol 74, no. 12, pp. A331-A331. He and Ne as tracers of natural CO2 migration from a deep reservoir  STUART GILFILLAN1*, MARK WILKINSON, R. STUART HASZELDINE, STEPHEN NELSON2 AND ROBERT POREDA3  1Scottish Centre for Carbon Storage, University of Edinburgh, UK. (*correspondence: stuart.gilfillan@ed.ac.uk)  2Department of Geological Sciences, Brigham Young University, Utah, USA.  3Department of Earth and Environmental Sciences, University of Rochester, New York, USA.   Capture and geological storage of CO2  is emerging as an attractive means of economically abating anthropogenic CO2 emissions from large point sources. However, for the technology to be universally deployed it is  imperative  that a reliable method  to asses the integrity of a storage site for both safety and regulation compliance exists. Hence, the ability to track, and identify the origin of, any CO2 seepage measured at the near-surface and ground surface is critical.  As an analogue for post-emplacement seepage, this presentation will examine natural CO2 rich springs and groundwater wells in the vicinity of the St. Johns Dome CO2 reservoir, located on the southern tip of the Colorado Plateau on the border of Arizona and New Mexico.  Extensive travertine deposits in the vacinity of St. Johns document a long history of the migration of CO2 rich fluids to the surface. Whilst travertine formation appears to be insignificant at present, there is strong evidence of the migration of CO2 rich fluids to the surface as shown by high levels of HCO3- in the surface spring waters.  Noble gases are conservative tracers within the subsurface, and combined with carbon stable isotopes, have proved to be extremely useful in determining both the origin of CO2 and how the CO2 is stored within natural CO2 reservoirs from around the world including St. Johns Dome [1,2]. This presentation will compare measurements of the dissolved 3He/4He, CO2/3He, 3He, 4He and 20Ne  concentrations from surface spring and groundwater well waters with those from the deep CO2 reservoir. We show that a component of the helium fingerprint observed in the gaseous CO2 contained in the St. Johns reservoir can be traced in waters from both the groundwater wells and the springs emerging at the surface above the reservoir. Our results show that CO2 can be traced from source to surface using noble gases and illustrates that this technique could be used to identify CO2 migration from engineered storage sites.  [1] Gilfillan et al., (2008) GCA 72, p.1174-1198. DOI:10.1016/j.gca.2007.10.009 [2] Gilfillan et al., (2009) Nature, 458, p.614-618. DOI:10.1038/nature07852 

He and Ne as tracers of natural CO2 migration from a deep reservoir

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