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In nine natural gas reservoirs examined in a study reported in 2009, researchers concluded that dissolving into groundwater accounted for up to 90 percent of the carbon dioxide lost from the reservoirs. That figure describes the share of the gas that left those reservoirs—not the share of carbon dioxide injected at an engineered storage site that will dissolve.
What happens to carbon dioxide underground?
Carbon dioxide held in a deep geological reservoir can dissolve into groundwater. In the natural reservoirs covered by the report, this process was identified as a major destination for carbon dioxide that was no longer present as gas in the reservoirs.
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Chemistry World reported on April 1, 2009, that researchers studied nine natural reservoirs, most deeper than 700 metres. The report said dissolution in water accounted for up to 90 percent of the carbon dioxide lost from the gas reservoirs. Chemistry World’s report is the source for those figures.
What does “up to 90 percent” mean?
The denominator matters: the reported percentage refers to carbon dioxide that had left the gas reservoirs the researchers examined. It is not a finding that 90 percent of all carbon dioxide injected into a storage site will dissolve, nor does it provide a general storage-efficiency estimate.
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The figure comes from historical secondary reporting. The accessible report and university archive do not supply the primary paper’s full methods or reservoir-by-reservoir calculations, so the exact calculation cannot be assessed from those sources alone.
Why is dissolution relevant to geological storage?
Dissolution offers one way carbon dioxide may be retained in groundwater rather than remaining in a separate gas phase. The 2009 report quoted study leader Stuart Gilfillan as saying: “What we tried to do with this work was to look at the longer timescale and find out where the CO2 ends up being stored, and our main conclusion is that most of it goes into the groundwater.”
Gilfillan also said some of the natural fields had stored carbon dioxide for up to 40 million years. That is a reported timescale for some of the natural fields described—not a demonstrated storage duration for engineered projects. The University of Edinburgh archive connects the coverage with Gilfillan’s research; the university currently identifies him as Professor of Geochemistry.
Does this prove an engineered storage site is safe?
No. Natural reservoirs can offer evidence about processes that operate over geological timescales, but this report does not establish how a particular engineered site will perform. It does not provide site-specific monitoring results, a safety assessment, or a basis for applying the reported percentage to injected carbon dioxide at other locations.
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The report is useful as evidence that dissolution into groundwater was inferred to be an important fate for carbon dioxide in the natural reservoirs studied. It should not be read as a guarantee about every reservoir or as a current assessment of commercial carbon capture and storage.
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What the historical report establishes
- The study, as described by Chemistry World in 2009, covered nine natural reservoirs, most more than 700 metres deep.
- The report attributed up to 90 percent of the carbon dioxide lost from those gas reservoirs to dissolution in water.
- It attributed storage of up to 40 million years in some natural fields to the study leader.
- The cited coverage does not provide the underlying calculations needed to judge how the reported fraction was derived or generalize it to engineered sites.
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