Geosequestration: Solution or Pipe Dream?
On April 2nd, Australia launched its first demonstration of their carbon dioxide geosequestration project. Funded by the Cooperative Research Centre for Greenhouse Gas Technologies, the Otway Project is located on a remote patch of land near Warrnambool in the south-western corner of Victoria. This project is a research project focused on carbon dioxide capture and geological storage.
This $40-million project simulates the capture of CO² from power generating stations by extracting already trapped CO² from sedimentary ground, otherwise known as the Otway Basin. From here, the carbon dioxide is carried several kilometers by pipeline to a depleted gas field about 2,000 meters below the surface. The project managers hope to safely store 100,000 tonnes of CO² within the next year.
Geosequ-what?
Geosequestration is hardly a new technology, but it has the potential to put quite a bit of the carbon we’ve extracted in the form of fossil fuels right back to where we got them … deep inside the Earth. CO² has been injected into the Earth for over 30 years already as a means to increase oil recovery. The technology is attractive because the storage costs are typically offset by the sale of additional oil that is recovered.
There are problems with this, of course, as the old wells and mines could have a tendency to “leak.” Proper geosequestration would require the CO² gas to be injected with high pressures and kept under 20 degrees Celsius (to keep the carbon in a liquefied state). This is typically only practical if the sequestration takes place under an ocean, like we see with the Norway’s Statoil natural-gas platform Sleipner in the North Sea, but can be properly handled on large continents if the geological bank is sealed with several kilometers of solid rock. Another problem would be the potential capacity of these fields, as we can’t expect to put every bit of carbon we’ve extracted from the planet right back where we found them.
That said, some of the better places we could store our atmospheric contaminants would be in unminable coal seams. Coal absorbs CO² quite naturally, ensuring long-term storage. In the process, though, methane is released from the seams. While this gas could be collected and sold to offset the costs of sequestering CO², the release and burning of methane would partially offset the desired result.
The Veritable Catch Twenty-One
Geosequestration is a step in the right direction, as it involves scrubbing the atmosphere or otherwise trapping CO² released from man-made operations and returning it to the Earth. However, the current cost of this technology does not make it a viable solution for anyone but the wealthiest of nations. That said, the cost of recovering one tonne of carbon is just $40, which is a full $60 less than the current going rate for a personal credit of a single tonne. If the technology becomes more affordable, it might just help shave 2 to 3% of the world’s annual carbon emissions.
It’s not much, but it’s a start.
What do you think of geosequestration? Is this a possible solution, or just a pipe dream?



















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