Publication Date:
2023-02-24
Description:
We assess the performance of an inverse Lagrangian dispersion technique for its suitability to quantify leakages from geological storage of CO2. We find the technique is accurate ((QbLS/Q)=0.99, sigma=0.29) when strict meteorological filtering is applied to ensure that Monin–Obukhov Similarity Theory is valid for the periods analysed and when downwind enrichments in tracer gas concentration are 1% or more above background concentration. Because of their respective baseline atmospheric concentrations, this enrichment criterion is less onerous for CH4 than for CO2. Therefore for geologically sequestered gas reservoirs with a significant CH4 component, monitoring CH4 as a surrogate for CO2 leakage could be as much as 10 times more sensitive than monitoring CO2 alone. Additional recommendations for designing a robust atmospheric monitoring strategy for geosequestration include: continuous concentration data; exact inter-calibration of up- and downwind concentration measurements; use of an array of point concentration sensors to maximise the use of spatial information about the leakage plume; and precise isotope ratio measurement to confirm the source of any concentration elevations detected.
Keywords:
Canberra, Australia; Carbon dioxide; CSIRO farm; DATE/TIME; ECO2; ELEVATION; Ginninderra; Line; Methane; Sample code/label; Sub-seabed CO2 Storage: Impact on Marine Ecosystems; δ13C, carbon dioxide, atmospheric; δ13C, methane, atmospheric
Type:
Dataset
Format:
text/tab-separated-values, 35 data points
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