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- W2765354191 abstract "Injection of CO 2 with H 2 S and SO 2 and Subsequent Mineral Trapping in Sandstone-Shale Formation Tianfu Xu 1 , John A. Apps 1 , Karsten Pruess 1 , and Hajime Yamamoto 2 Earth Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA Civil Engineering Research Institute, Taisei Corporation, 344-1, Nase-cho, Totsuka-ku, Yokohama 245-0051, Japan Abstract. Carbon dioxide (CO 2 ) injection into deep geologic formations can potentially reduce atmospheric emissions of greenhouse gases. Sequestering less-pure CO 2 waste streams (containing H 2 S and/or SO 2 ) would be less expensive or would require less energy than separating CO 2 from flue gas or a coal gasification process. The long-term interaction of these injected acid gases with shale-confining layers of a sandstone injection zone has not been well investigated. We therefore have developed a conceptual model of injection of CO 2 with H 2 S and/or SO 2 into a sandstone-shale sequence, using hydrogeologic properties and mineral compositions commonly encountered in Gulf Coast sediments of the United States. We have performed numerical simulations of a 1-D radial well region considering sandstone alone and a 2-D model using a sandstone-shale sequence under acid-gas injection conditions. Results indicate that shale plays a limited role in mineral alteration and sequestration of gases within a sandstone horizon for short time periods (10,000 years in present simulations). The co-injection of SO 2 results in different pH distribution, mineral alteration patterns, and CO 2 mineral sequestration than the co-injection of H 2 S or injection of CO 2 alone. Simulations generate a zonal distribution of mineral alteration and formation of carbon and sulfur trapping minerals that depends on the pH distribution. The co-injection of SO 2 results in a larger and stronger acidified zone close to the well. Precipitation of carbon trapping minerals occurs within the higher pH regions beyond the acidified zones. In contrast, sulfur trapping minerals are stable at low pH ranges (below 5) within the front of the acidified zone. Corrosion and well abandonment due to the co-injection of SO 2 could be important" @default.
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- W2765354191 date "2004-09-07" @default.
- W2765354191 modified "2023-09-24" @default.
- W2765354191 title "Injection of CO2 with H2S and SO2 and Subsequent Mineral Trapping in Sandstone-Shale Formation - eScholarship" @default.
- W2765354191 hasPublicationYear "2004" @default.
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