Subsurface monitoring of anthropogenic CO 2 injected in sedimentary basins: Results from the Frio-I brine test, Texas, USA
By: Y.K. Kharaka, J.J. Thordsen, S.D. Hovorka, H.S. Nance, D.R. Cole, T.J. Phelps, and K.G. Knauss
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Abstract
To investigate the potential for the long-term storage of CO 2 in deep saline aquifers, 1600 t of CO 2 were injected at 1500m depth into a 24-m-thick "C" sandstone of the Frio Formation near Houston, Texas. Fluid samples obtained before CO 2 injection from the injection well and an observation well 30m updip showed a Na-Ca-Cl type brine with ∼93,000 mg/L TDS at saturation with CH 4, but only 0.3% CO 2. Following CO 2 breakthrough, samples showed sharp drops in pH, pronounced increases in alkalinity and Fe, and significant shifts in the isotopic compositions of H 2O, and DIC. These parameters, together with perfluorocarbon tracer gases were used for monitoring migration of injected CO 2 into the overlying Frio "B", a 4-m-thick sandstone, separated from the "C" by ∼15m of shale and siltstone beds. Results from "B" 6 mo after injection show significant CO 2 (2.9% vs. 0.3% CO 2) migration into the "B" sandstone. Results of samples collected 15 mo after injection, however, show no indications of additional CO 2 in the "B" sandstone.
Suggested Citation
Kharaka, Y., Thordsen, J., Hovorka, S., Nance, H., Cole, D., Phelps, T., Knauss, K., 2007, Subsurface monitoring of anthropogenic CO 2 injected in sedimentary basins: Results from the Frio-I brine test, Texas, USA, in Proceedings of the 12th International Symposium on Water-Rock Interaction, p. 597-601.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Subsurface monitoring of anthropogenic CO 2 injected in sedimentary basins: Results from the Frio-I brine test, Texas, USA |
| Year Published | 2007 |
| Language | English |
| Description | 5 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Proceedings of the 12th International Symposium on Water-Rock Interaction |
| First page | 597 |
| Last page | 601 |