Geochemical detection of carbon dioxide in dilute aquifers |
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| Authors: | Susan Carroll Yue Hao Roger Aines |
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| Institution: | (1) Chemistry, Materials, Earth and Life Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA |
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| Abstract: | Background Carbon storage in deep saline reservoirs has the potential to lower the amount of CO2 emitted to the atmosphere and to mitigate global warming. Leakage back to the atmosphere through abandoned wells and along
faults would reduce the efficiency of carbon storage, possibly leading to health and ecological hazards at the ground surface,
and possibly impacting water quality of near-surface dilute aquifers. We use static equilibrium and reactive transport simulations
to test the hypothesis that perturbations in water chemistry associated with a CO2 gas leak into dilute groundwater are important measures for the potential release of CO2 to the atmosphere. Simulation parameters are constrained by groundwater chemistry, flow, and lithology from the High Plains
aquifer. The High Plains aquifer is used to represent a typical sedimentary aquifer overlying a deep CO2 storage reservoir. Specifically, we address the relationships between CO2 flux, groundwater flow, detection time and distance. The CO2 flux ranges from 103 to 2 × 106 t/yr (0.63 to 1250 t/m2/yr) to assess chemical perturbations resulting from relatively small leaks that may compromise long-term storage, water quality,
and surface ecology, and larger leaks characteristic of short-term well failure. |
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