Effect of oxygen co-injected with carbon dioxide on Gothic shale caprock–CO₂–brine interaction during geologic carbon sequestration

Journal Article · Sun Sep 01 04:00:00 EDT 2013 · Chemical Geology

DOI:https://doi.org/10.1016/j.chemgeo.2013.06.019· OSTI ID:1094913

Jung, Hun Bok; Um, Wooyong; Cantrell, Kirk J.

Co-injection of oxygen, a significant component in CO₂ streams produced by the oxyfuel combustion process, can cause a significant alteration of the redox state in deep geologic formations during geologic carbon sequestration. The potential impact of co-injected oxygen on the interaction between synthetic CO₂–brine (0.1 M NaCl) and shale caprock (Gothic shale from the Aneth Unit in Utah) and mobilization of trace metals was investigated at ~ 10 MPa and ~ 75 °C. A range of relative volume percentages of O₂ to CO₂ (0, 1, 4 and 8%) were used in these experiments to address the effect of oxygen on shale–CO₂–brine interaction under various conditions. Major mineral phases in Gothic shale are quartz, calcite, dolomite, montmorillonite, and pyrite. During Gothic shale–CO₂–brine interaction in the presence of oxygen, pyrite oxidation occurred extensively and caused enhanced dissolution of calcite and dolomite. Pyrite oxidation and calcite dissolution subsequently resulted in the precipitation of Fe(III) oxides and gypsum (CaSO₄·2H₂O). In the presence of oxygen, dissolved Mn and Ni were elevated because of oxidative dissolution of pyrite. The mobility of dissolved Ba was controlled by barite (BaSO₄) precipitation in the presence of oxygen. Dissolved U in the experimental brines increased to ~ 8–14 μg/L, with concentrations being slightly higher in the absence of oxygen than in the presence of oxygen. Experimental and modeling results indicate the interaction between shale caprock and oxygen co-injected with CO₂ during geologic carbon sequestration can exert significant impacts on brine pH, solubility of carbonate minerals, stability of sulfide minerals, and mobility of trace metals. The major impact of oxygen is most likely to occur in the zone near CO₂ injection wells where impurity gases can accumulate. Finally, oxygen in CO₂–brine migrating away from the injection well will be continually consumed through the reactions with sulfide minerals in deep geologic formations.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1094913
• Report Number(s): PNNL-SA-96481; AA3030100
• Journal Information: Chemical Geology, Journal Name: Chemical Geology Journal Issue: C Vol. 354; ISSN 0009-2541
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

Carbon sequestration
Gothic shale
Metal mobilization
Oxygen
Pyrite oxidation