Ancient analogues for CO2 sequestration in coal measures, Gunnedah and Bowen Basins

Golding, S. D., Uysal, I. T., Boreham, C. J. and Esterle, J. S. (2008). Ancient analogues for CO2 sequestration in coal measures, Gunnedah and Bowen Basins. In: CO2CRC Research Symposium 2008: Program & abstracts. CO2CRC Research Symposium 2008: Accelerating CCS Deployment, Queenstown, N.Z., (93-93). 1-4 December 2008.

Author Golding, S. D.
Uysal, I. T.
Boreham, C. J.
Esterle, J. S.
Title of paper Ancient analogues for CO2 sequestration in coal measures, Gunnedah and Bowen Basins
Formatted title
Ancient analogues for CO2 sequestration in coal measures, Gunnedah and Bowen Basins
Conference name CO2CRC Research Symposium 2008: Accelerating CCS Deployment
Conference location Queenstown, N.Z.
Conference dates 1-4 December 2008
Proceedings title CO2CRC Research Symposium 2008: Program & abstracts
Place of Publication Canberra, ACT, Australia
Publisher Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC)
Publication Year 2008
Sub-type Poster
Start page 93
End page 93
Total pages 1
Language eng
Formatted Abstract/Summary
Coal bed methane (CBM) fields in sedimentary basins are possible repositories for anthropogenic CO2, with the added economic benefit of enhanced recovery of CBM. CO2 is stored in coal as adsorbed molecules on micropore surfaces, but will also dissolve in formation water (solution trapping) and react with Ca, Mg and Fe-bearing minerals in the coal. Dissolution and precipitation reactions will buffer the pH decrease associated with injection of CO2 and may result in the formation of carbonates (mineral trapping). In the current study we have investigated mineral paragenesis and the physico-chemical conditions under which diagenesis occurred in CO2-rich and CO2-poor coal seams and adjacent strata of the Gunnedah and Bowen Basins.

Intense carbonate veining and cleat mineralisation in the Gunnedah Basin is associated with local Cretaceous – Tertiary intrusions, whereas widespread carbonate veining and cementation in the Bowen Basin is largely the product of basin-wide interaction with CO2-rich meteoric hydrothermal fluids. Dawsonite is absent in the Bowen Basin (except the Denison Trough), but it is common along cleats and fractures in the Gunnedah Basin, indicating elevated CO2 fugacity and alkalinity in the geochemically more evolved environment at the latest stage of the fluid flow process.

The formation of dawsonite is attributed to low permeability of the system and high sorption capacity of CO2 on coal that facilitated increasing CO2 accumulation in the coal seams with insignificant leakage. Based on stable/radiogenic isotope and trace element data, possible CO2 sources for the carbonates include 1) thermal degradation of organic matter (calcite and ankerite), 2) bacterial methanogenesis (siderite), and 3) magmatic gas (dawsonite and some calcite-ankerite). Gas stable isotopes confirm generation of secondary biogenic methane in CO2-rich coal seams by reduction of CO2 that suggests methanogenesis in shallower coal seams provides an additional sequestration mechanism for CO2.
© CO2CRC 2008
Subjects 050301 Carbon Sequestration Science
Keyword Coal bed methane (CBM)
Bowen Basin
Gunnedah Basin
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Presented during the "Storage Posters" session as Poster 33.

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Created: Mon, 01 Mar 2010, 15:51:54 EST by Michael Affleck on behalf of Faculty of Science