Injection of CO2 with H2S and SO2 and Subsequent Mineral Trapping in Sandstone-Shale Formation

摘要: Carbon dioxide (CO{sub 2}) injection into deep geologic formations can potentially reduce atmospheric emissions of greenhouse gases. Sequestering less-pure CO{sub 2} waste streams (containing H{sub 2}S and/or SO{sub would be less expensive or require energy than separating from flue gas a coal gasification process. The long-term interaction these injected acid gases with shale-confining layers sandstone zone has not been well investigated. We therefore have developed conceptual model sandstone-shale sequence, using hydrogeologic properties and mineral compositions commonly encountered in Gulf Coast sediments the United States. performed numerical simulations 1-D radial region considering alone 2-D sequence under acid-gas conditions. Results indicate that shale plays limited role alteration sequestration within horizon for short time periods (10,000 years present simulations). co-injection results different pH distribution, patterns, alone. Simulations generate zonal distribution formation carbon sulfur trapping minerals depends on distribution. larger stronger acidified close to well. Precipitation occurs higher regions beyond zones. In contrast, are stable at low ranges (below 5) front zone. Corrosion abandonment due could important issues. Significant is sequestered ankerite dawsonite, some siderite. mineral-trapping capability reach 80 kg per cubic meter medium. Most trapped through alunite precipitation, although by anhydrite precipitation minor amount pyrite. addition induced result changes porosity. information currently available mineralogy natural high-pressure reservoirs generally consistent our simulations.