Geochemical tracers for monitoring offshore CO2 stores

J. Roberts, Stuart Gilfillan, Linda Stalker, Mark Naylor

Research output: Contribution to journalArticlepeer-review

Abstract

Chemical tracers are proposed as an effective means of detecting, attributing and quantifying any CO2 leaks to
surface from geological CO2 storage sites, a key component of Carbon Capture and Storage (CCS) technology. A
significant proportion of global CO2 storage capacity is located offshore, with some regions of the world having no
onshore stores. To assure regulatory bodies and the public of CO2 storage integrity it is important to demonstrate that
robust offshore monitoring systems are in place. A range of chemical tracers for leakage have been tested at onshore
pilot CCS projects worldwide, but to date they have not been trialled at injection projects or CO2 release experiments
located offshore. Here, for the first time, we critically review the current issues surrounding commercial scale use of
tracers for offshore CCS projects, and examine the constraints and cost implications posed by the marine
environment. These constraints include the logistics of sampling for tracers offshore, the fate of tracers in marine
environments, tracer background levels, marine toxicity and legislative barriers – with particular focus on the Europe
and the UK. It is clear that chemicals that form a natural component of the CO2 stream are preferable tracers for ease
of permitting and avoiding cost and risks of procuring and artificially adding a tracer. However, added tracers offer
more reliability in terms of their unique composition and the ability to control and regulate concentrations. We identify
helium and xenon isotopes (particularly 124,129Xe), and artificial tracers such as PFCs and deuterated methane as
the most suitable added tracers. This is due to their conservative behaviour, low environmental impact and relative
inexpense. Importantly, we also find that SF6 and C14 are not viable tracers for CCS due to environmental concerns,
and many other potential tracers can be ruled out on the basis of cost. Further, we identify key challenges that are
unique to using tracers for offshore monitoring, and highlight critical uncertainties that future work should address.
These include possible adsorption or dispersion of tracer compounds during ascent through the overburden, longevity
of tracers over the timeframes relevant for CCS monitoring, the permissible environmental effects of tracer leakage,
and tracer behaviour in seabed CO2 bubble streams and in dissolved CO2. These uncertainties directly affect the
selection of appropriate tracers, the injection programme and concentrations necessary for their reliable detection, and
appropriate sampling approaches. Hence offshore tracer selection and associated expense are currently poorly
constrained. Further, there is limited experience of sampling for tracers in the marine environment; current approaches
are expensive and must be streamlined to enable affordable monitoring strategies. Further work is necessary to
address these unknowns so as to evaluate the performance of potential tracers for CO2 leak quantitation and provide
more accurate costings for effective offshore tracer monitoring programmes.
Original languageEnglish
JournalInternational Journal of Greenhouse Gas Control
DOIs
Publication statusPublished - 4 Oct 2017

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