Using oxygen isotopes to quantitatively assess residual CO2 saturation during the CO2CRC otway stage 2B extension residual saturation test
Serno, Sascha and Johnson, Gareth and LaForce, Tara C. and Ennis-King, Jonathan and Haese, Ralf R. and Boreham, Christopher J. and Paterson, Lincoln and Freifeld, Barry M. and Cook, Paul J. and Kirste, Dirk and Haszeldine, R. Stuart and Gilfillan, Stuart M. V. (2016) Using oxygen isotopes to quantitatively assess residual CO2 saturation during the CO2CRC otway stage 2B extension residual saturation test. International Journal of Greenhouse Gas Control, 52. pp. 73-83. ISSN 1750-5836 (https://doi.org/10.1016/j.ijggc.2016.06.019)
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Abstract
Residual CO2 trapping is a key mechanism of secure CO2 storage, an essential component of the Carbon Capture and Storage technology. Estimating the amount of CO2 that will be residually trapped in a saline aquifer formation remains a significant challenge. Here, we present the first oxygen isotope ratio (δ18O) measurements from a single-well experiment, the CO2CRC Otway 2B Extension, used to estimate levels of residual trapping of CO2. Following the initiation of the drive to residual saturation in the reservoir, reservoir water δ18O decreased, as predicted from the baseline isotope ratios of water and CO2, over a time span of only a few days. The isotope shift in the near-wellbore reservoir water is the result of isotope equilibrium exchange between residual CO2 and water. For the region further away from the well, the isotopic shift in the reservoir water can also be explained by isotopic exchange with mobile CO2 from ahead of the region driven to residual, or continuous isotopic exchange between water and residual CO2 during its back-production, complicating the interpretation of the change in reservoir water δ18O in terms of residual saturation. A small isotopic distinction of the baseline water and CO2 δ18O, together with issues encountered during the field experiment procedure, further prevents the estimation of residual CO2 saturation levels from oxygen isotope changes without significant uncertainty. The similarity of oxygen isotope-based near-wellbore saturation levels and independent estimates based on pulsed neutron logging indicates the potential of using oxygen isotope as an effective inherent tracer for determining residual saturation on a field scale within a few days.
ORCID iDs
Serno, Sascha, Johnson, Gareth ORCID: https://orcid.org/0000-0002-3151-5045, LaForce, Tara C., Ennis-King, Jonathan, Haese, Ralf R., Boreham, Christopher J., Paterson, Lincoln, Freifeld, Barry M., Cook, Paul J., Kirste, Dirk, Haszeldine, R. Stuart and Gilfillan, Stuart M. V.;-
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Item type: Article ID code: 66709 Dates: DateEvent30 September 2016Published9 July 2016Published Online21 June 2016AcceptedNotes: This work is part of the project "Quantifying Residual and Dissolution Trapping in the CO2CRC Otway Injection Site", funded by UKCCSRC as a Call 2 project. The grant number is UKCCSRC-C2-204. Main PI: Stuart Gilfillan. Subjects: Technology > Engineering (General). Civil engineering (General) Department: Faculty of Engineering > Civil and Environmental Engineering Depositing user: Pure Administrator Date deposited: 24 Jan 2019 10:01 Last modified: 01 Oct 2024 00:31 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/66709