CO2 storage in a depleted gas field: An overview of the CO2CRC Otway Project and initial results

Underschultz, Jim, Boreham, Chris, Dance, Tess, Stalker, Linda, Freifeld, Barry, Kirste, Dirk and Ennis-King, Jonathan (2011) CO2 storage in a depleted gas field: An overview of the CO2CRC Otway Project and initial results. International Journal of Greenhouse Gas Control, 5 4: 922-932. doi:10.1016/j.ijggc.2011.02.009

Author Underschultz, Jim
Boreham, Chris
Dance, Tess
Stalker, Linda
Freifeld, Barry
Kirste, Dirk
Ennis-King, Jonathan
Title CO2 storage in a depleted gas field: An overview of the CO2CRC Otway Project and initial results
Journal name International Journal of Greenhouse Gas Control   Check publisher's open access policy
ISSN 1750-5836
Publication date 2011-07-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.ijggc.2011.02.009
Open Access Status
Volume 5
Issue 4
Start page 922
End page 932
Total pages 11
Place of publication London, United Kingdom
Publisher Elsevier
Language eng
Abstract The Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC) Otway Project in Australia is the first heavily monitored pilot site for CO2 storage in a depleted natural gas reservoir. With the site characterisation and risk analysis complete, the new CRC-1 injection well was drilled in April 2007. An updated static and dynamic model forecast an injected gas transit time of between 4 and 8months between CRC-1 injection and Naylor-1 observation wells. Injection began on March 18th 2008 and was halted on August 29th 2009 with 65,445 tonnes of CO2 mixed gas stored. Two pulses of tracer compounds were added to help identify the injected CO2 from other naturally occurring CO2 and to track dispersion and diffusion. Assurance monitoring included surveillance of the atmosphere, soil gas and shallow groundwater. To date, no tracer compounds have been detected above background levels in samples taken as part of the assurance monitoring system. Monitoring of the reservoir has been accomplished with a combined geophysical and geochemical approach. Formation fluids are sampled at pressure with the multilevel U-Tube system. The transient geochemistry at the observation well has: (1) recorded injected gas arrival at the Naylor-1 observation well; (2) recorded tracer compound arrival at Naylor-1; (3) shown a mixing trend between the isotopic signature of the Naylor indigenous CO2 and that of the injection supply gas; and (4) provided an estimate for the dynamic storage capacity for a portion of the Naylor reservoir. The data collected are compared with the pre-injection dynamic model forecasts and provide a means of calibration. The CO2CRC Otway Project has successfully demonstrated the storage of CO2 in a depleted gas field. Geochemical assurance monitoring and reservoir surveillance will continue post injection. Continued analysis of the data will serve to reduce uncertainty in forecasting long term fate of the injected CO2 mixed gas.
Keyword Otway basin
Carbon dioxide storage
Depleted gas field
Dynamic modeling
Monitoring and verification
Tracer compounds
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Sustainable Minerals Institute Publications
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