Monitoring of CO2 storage in a depleted natural gas reservoir: Gas geochemistry from the CO2CRC Otway Project, Australia  


Authors / CoAuthors

Boreham, C.J. | Underschultz, J.R. | Stalker, L. | Kirste, D. | Freifeld, B. | Jenkins, C. | Ennis-King, J.

Abstract

The CO2CRC Otway Project in southwestern Victoria, Australia has injected over 17 months 65 445 tonnes of a mixed carbon dioxide-methane fluid into the water leg of a depleted natural gas reservoir at a depth of approximately 2km. Pressurized sub-surface fluids were collected from the Naylor-1 observation well using a tri-level U-tube sampling system located near the crest of the fault-bounded anticline trap, 300 metres up-dip of the CRC-1 gas injection well. Relative to the pre-injection gas-water contact (GWC), only the shallowest U-tube initially accessed the residual methane gas cap. The pre-injection gas cap at Naylor-1 contains CO<sub>2</sub> at 1.5 mol% compared to 75.4 mol% for the injected gas from the Buttress-1 supply well and its CO<sub>2</sub> is depleted in <sup>13</sup>C by 4.5%<sub>0</sub> VPDB compared to the injected supercritical CO<Sub>2</sub>. Additional assurance of the arrival of injected gas at the observation well is provided by the use of the added tracer compounds, CD<sub>4</sub>, Kr and SF<sub>6</sub> in the injected gas stream. Lessons learnt from the CO2CRC Otway Project have enabled us to better anticipate the challenges for rapid deployment of carbon dioxide in a commercial environment at much larger scales.

Product Type

nonGeographicDataset

eCat Id

72909

Contact for the resource

  Custodian

ED  

  Owner

Commonwealth of Australia (Geoscience Australia)  

  Custodian

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Digital Object Identifier

http://dx.doi.org/10.1016/j.ijggc.2011.03.011

Keywords

  • External PublicationScientific Journal Paper
( Theme )
  • carbon dioxide
  • AU-SAAU-TASAU-VIC
Australian and New Zealand Standard Research Classification (ANZSRC)
  • Earth Sciences
  • Published_External

Publication Date

2011-01-01T00:00:00

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Australian Government Security ClassificationSystem    

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Creative Commons Attribution 4.0 International Licence    

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unknown

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geoscientificInformation

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Unknown

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Extents

[-40.75, -36.75, 138.25, 145.25]

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