Influence of Supercritical CO2 on the Mobility and Desorption of Trace Elements from CO2 Storage Rock Sandstone and Caprock Shale in a Potential CO2 Sequestration Site in Taiwan

Abstract

Excess carbon dioxide emission was considered as the most important cause of increased trend of global warming. Significant amounts of research were devoted to the reduction of CO 2 emission and CO 2 sequestration. Sequestration of CO 2 in empty oil reservoirs was considered as one of the most promising options. However, the effects of metal release and mobility as a result of CO 2 injection were not studied in detail, particularly under super-critical CO 2 (scCO 2 ) conditions. In this study, the release of selected metals immersed in distilled water for varying amounts of time in the absence and presence of scCO 2 was assessed in simulated conditions at 90°C and 24 MPa. Significant increases in dissolution of Fe, Sr, and Ba by 3, 8, and 24 times were found when the storage rock sandstone or caprock shale was immersed in DI water for different time period. However, in the presence of scCO 2 , the dissolution of these metals was reduced by 80% for Fe, suggesting permanent sequestration of scCO 2 into carbonate minerals. The trend in changes of pore water chemistry in the sandstone and shale after being immersed in DI water showed dissolution of Sr-bearing mineral and precipitation of Ba-bearing mineral.

Carbon Dioxide Leakages through Fault Zones: Potential Implications for the Long-term Integrity of Geological Storage Sites

“…These phenomena may be indicative of the degassing of the carbon-dioxide charged fluids (Xu et al, 2004;Kampman et al, 2016;Uysal et al, 2019) as they migrate upwards and eventually reach shallower depths at lower pressure influenced by atmospheric pressure changes as a result of changes of atmospheric temperature. The geochemical reaction of carbon-dioxide degassing and carbonate precipitation (Kampman et al, 2012;Armitage et al, 2013;Frank et al, 2015;Jean et al, 2016) can control carbon dioxide-leakage levels from the fault zones (Ayayi et al, 2019). The temporal trend in carbon dioxide levels comprises a repeating tide-like pattern, and potentially indicates pulsing of carbon dioxide into the shallow groundwater system from deeper crustal formations.…”

Characteristics of Carbon Dioxide Emissions from a Seismically Active Fault

“…Carbon dioxide emissions have globally received more and more attention, with scientific concerns including greenhouse effects (Huang and Tan, 2014;Jean et al, 2015), health of ecosystems (Wright et al, 2018), radiative forcing (Bari and Bergot, 2018;Bansal, et al, 2019), global carbon cycle (Chatterjee et al, 2019), as well as carbon dioxide capture and geological storage (Soong et al, 2014;Yang et al, 2014;Phelps et al, 2015;Jen et al, 2017;Wang et al, 2018). The global carbon dioxide level is generally balanced by geochemical processes over a long period of time (Ballantyne et al, 2012).…”

CO2 Separation by Using a Three-stage Membrane Process

“…Meanwhile, with continuous exploration, a number of oilfields with a higher CO 2 content are presented. For example, the CO 2 concentration in extraction gas fields in Malaysia ranges from 28% to 87% (Tan et al, 2012b;Jean et al, 2016;Xie et al, 2017;Yang et al, 2019). If large amount of CO 2 will be discharged directly into the atmosphere, it will not only cause serious climate problems, but also can be harmful to human health (Ping et al, 2018;Shiue et al, 2018;Tsai et al, 2018).…”