Concentrations of dissolved organic compounds reported in oil-field waters are high (=10,000 mg/L), and are dominated by acetate, propionate and succinate, with significant values for toxic organic compounds, including BTEX (=60 mg/L), phenols (=20 mg/L), and polycyclic aromatic hydrocarbons (=10 mg/L for PAHs). The DOC values obtained in samples from the Frio Brine tests (Dayton, TX) prior to CO2 injection were expectedly low (1�5 mg/L), increasing  during the CO2 injection to 5�6 mg/L. DOC values, however, increased unexpectedly by a factor of 100 on samples collected several weeks after injection stopped. The concentrations of organic acid anions, BTEX and PAHs were low (<1 mg/L), but values of formate, acetate, and toluene were higher in high DOC samples. Results obtained to date in brine samples from Tuscaloosa Formation, indicate solubility enhancement of organic compounds, in particular the alkylated PAHs, following CO2 injection for EOR operations at the Cranfield Oil field, Mississippi.

Carbon dioxide storage in sedimentary basins: Organic compounds in formation water following CO<sub>2</sub> injection

239th National Meeting (2010)

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Carbon dioxide storage in sedimentary basins: Organic compounds in formation water following CO2 injection

Carbon dioxide storage in sedimentary basins: Organic compounds in formation water following CO₂ injection