Effects of Mineralization on Carbon Sequestration in the South Georgia Embayment of the Atlantic Outer Continental Shelf
Abstract
Carbon dioxide mineralization is one of the most robust approaches of carbon storage for long-term CO2 sequestration. Critical to this technology is an understanding of the geochemical processes which produce stable carbonate minerals and aid development of the caprock/seal. Carbon dioxide mineralization depends primarily on two factors that play a significant role in the potential reaction pathways. The first factor relates to the local geochemical compositions within the potential reservoir fluid. The second factor is based on matrix lithology, siliciclastic, or carbonate. The South Georgia Embayment (SGE) within the U.S. Outer Continental Shelf (OCS) shows similar facies variation between the siliciclastic type like the Carolina trough in the north and the carbonate type such as the Blake Plateau basin in the South Florida platform. This study documents the scenario of CO2 injection in geologic formations with different geochemical compositions in Upper Cretaceous deposits of the SGE, and the modeled response of the porous network on the distribution of mineralization after the dissolution phase has occurred due to the mixing of CO2 with pore fluids. These results catalyze future studies on the time scale of the relationship between seal degradation due to hydrostatic CO2 plume pressure and mineralization.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMMR0090010A
- Keywords:
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- 1858 Rocks: chemical properties;
- HYDROLOGY;
- 1859 Rocks: physical properties;
- HYDROLOGY;
- 3653 Fluid flow;
- MINERALOGY AND PETROLOGY;
- 8045 Role of fluids;
- STRUCTURAL GEOLOGY