HR: 1340h
AN: U43C-1391    [Abstracts]
TI: Isotope tracing of CO2 Seepage: Results from Controlled Release Experiment in Bozeman, Montana, USA
AU: * Fessenden, J E
EM: julianna@lanl.gov
AF: Los Alamos National Laboratory, EES-6, MS D462 PO BOX 1663, Los Alamos, NM 87545, United States
AU: Dentaku, K
EM: dentaku78@yahoo.com
AF: Montana State University, 207 Montana Hall, Bozeman, MT 59717-2460, United States
AU: Rauch, H
EM: hrauch@wvu.edu
AF: West Virginia University, Department of Geology and Geography 423 White Hall, Morgantown, WV 26506, United States
AU: Dobeck, L
EM: dobeck@chemistry.montana.edu
AF: Montana State University, 207 Montana Hall, Bozeman, MT 59717-2460, United States
AU: Pickles, W L
EM: wpickles@ucsc.edu
AF: UC Santa Cruz, Center for Remote Sensing Earth and Marine Science Bldg., Santa Cruz, CA 95064, United States
AU: Spangler, L
EM: spangler@montana.edu
AF: Montana State University, 207 Montana Hall, Bozeman, MT 59717-2460, United States
AB: The geological storage of carbon dioxide (CO2) captured from the emissions of combustion of fossil fuels is a promising option to mitigate the increase in atmospheric greenhouse gases. Within the past 5 years, efforts in understanding the storage capacity, chemical and physical alteration, and the leak potential of CO2 impact to various reservoir types have been researched both at the laboratory and field. State-of-the-art monitoring equipment and models in the areas of geophysics, geochemistry, atmospheric chemistry, and remote sensing are being employed within this research area. Specifically, over the past 2 years, a controlled field experiment has taken place in Bozeman, Montana where pure CO2 has been released at known rates and depths to quantify the detection limits of various monitoring techniques for the use of CO2 seepage detection. In 2006, CO2 was injected at 0.1 ton/day for 10 days at 2.5 m depth through a vertical well, and in 2007, CO2 was injected at 0.1 ton/day for 10 days at an average of 2 m depth through a horizontal well. The monitoring tool highlighted in this paper, is the use of stable isotope detection of CO2 seepage into atmospheric, vegetation, and groundwater reservoirs. Preliminary results show a distinct isotopic impact to the local groundwater (at 1.2 m depth) and surface CO2 (as measured with closed surface chambers) within 24 hours after CO2 was injected. Plume development and dispersion as well as quantification of seepage CO2 versus natural CO2 are discussed.
DE: 0454 Isotopic composition and chemistry (1041, 4870)
DE: 1094 Instruments and techniques
DE: 1694 Instruments and techniques
DE: 1829 Groundwater hydrology
DE: 4870 Stable isotopes (0454, 1041)
SC: Union [U]
MN: 2007 Fall Meeting