Deployment of a Carbon Isotope Ratiometer for the Monitoring of CO2 Sequestration Leakage

作者：McAlexander Ian; Rau Greg H; Liem Jimmy; Owano Thomas; Fellers Ray; Baer Douglas; Gupta Manish^*

来源：Analytical Chemistry, 2011, 83(16): 6223-6229.

DOI：10.1021/ac2007834

In an effort to monitor leakage from underground CO2 storage, a field-deployable analyzer capable of rapidly measuring the CO2 mixing ratio and delta C-13 values (+/- 0.05 ppm(v) +/- 0.2 parts per thousand, 60 s) was deployed to distinguish between biogenic and fossil CO2 sources. The analyzer was interfaced with a multiport inlet unit to allow autonomous sampling from multiple locations. The instrument and inlet interface were deployed at the Zero Emissions Research and Technology (ZERT) site (Bozeman, Montana, july 14-22, 2009) during a controlled, subsurface release of CO2 depleted in C-13. A biogenic diurnal cycle was observed far from the release, and the associated Keeling plot suggested a CO2 source (delta C-13 = -27.0 +/- 0.5 parts per thousand) consistent with local C-3 vegetation. Inlets near the leak showed large CO2 mixing ratios (388/>40 000 ppm(v)) whose predominant source was the release CO2 (inferred delta C-13 = -58.2 +/- 0.7 parts per thousand). Measurements 3 m from the source showed diurnal CO2 cycles (382-2400 ppm(v)) influenced by leaked CO2, possibly due to diel air mixing. Finally, the data from all of the sampling inlets was combined to spatially localize the leak position.

• 出版日期2011-8-15