Natural analogues for storage of CO2 in coal systems, Gunnedah and Bowen Basins, Australia

Baublys, Kim A., Esterle, Joan S., Feng, Y.X., Golding, Suzanne D. and Uysal, Ibrahim T. (2009). Natural analogues for storage of CO2 in coal systems, Gunnedah and Bowen Basins, Australia. In: Goldschmidt Conference Abstracts 2009. 19th Annual VM Goldschmidt Conference, Davos, Switzerland, (A448-A448). 21-26 June 2009.

Author Baublys, Kim A.
Esterle, Joan S.
Feng, Y.X.
Golding, Suzanne D.
Uysal, Ibrahim T.
Title of paper Natural analogues for storage of CO2 in coal systems, Gunnedah and Bowen Basins, Australia
Formatted title
Natural analogues for storage of CO2 in coal systems, Gunnedah and Bowen Basins, Australia
Conference name 19th Annual VM Goldschmidt Conference
Conference location Davos, Switzerland
Conference dates 21-26 June 2009
Proceedings title Goldschmidt Conference Abstracts 2009
Place of Publication Switzerland
Publisher Acta
Publication Year 2009
Sub-type Published abstract
Start page A448
End page A448
Total pages 1
Language eng
Formatted Abstract/Summary
Coal bed methane (CBM) fields in sedimentary basins are possible storage sites for anthropogenic CO2 with the added economic benefit of enhanced recovery of CBM. CO2 can also be stored in deep unmineable coal seams although this option
is less attractive because of injectivity issues and the lack of an economic byproduct. Natural accumulations of CO2 in coal seams are commonly derived from inorganic sources and provide natural analogues for predicting the long term behaviour of CO2 in coal geosequestration systems. We have dated illitic clay minerals associated with calciteankerite mineralisation in the Gunnedah and Bowen Basins using the Rb-Sr method. Illite fractions from a high CO2 hole in the Oaky Creek area have a Rb-Sr isochron age of 208±5 Ma. These Rb-Sr data together with comprehensive K-Ar and
Rb-Sr geochronology from across the Bowen Basin indicate clay-carbonate  precipitation from CO2-rich meteoric fluids during the Late Triassic regional extension. On the other hand, Rb-Sr data for Gunnedah Basin illites have ages of 85±4 Ma and 94±1 Ma that reflect heat and CO2 release from local magmatic intrusions in the Late Cretaceous. Sr isotope and rare earth element (REE) data for the Gunnedah Basin samples indicate that the majority of calciteankerite and dawsonite precipitated from fluids that had interacted with or been derived from relatively young igneous intrusions. Much higher 87Sr/86Sr ratios of the Denison Trough dawsonite cements in sandstones can be explained by the interaction of fluids with detrital K-feldspar. The formation of dawsonite is attributed to elevated CO2 fugacity and alkalinity in the geochemically more evolved environment at the latest stage of the fluid flow process. Our results indicate that CO2 has largely been used for carbonate precipitation (mineral trapping) in eastern Australian basins in a temperature range between 100 and 200°C at depths less than 3000m with a significant proportion stored in coal seams as adsorbed molecules on coal since the Mesozoic (adsorption trapping).
Gas stable isotopes confirm generation of seconday biogenic methane in CO2-rich coal seams by reduction of CO2 that suggests methanogenesis provides an  additional sequestration mechanism for CO2 in coal seams.
Subjects 0403 Geology
970104 Expanding Knowledge in the Earth Sciences
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ

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Created: Tue, 27 Apr 2010, 13:07:46 EST by Tracy Paroz on behalf of School of Earth Sciences