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Experimental Study on the Geochemical and Mineralogical Alterations in a Supercritical CO2-Groundwater-Zeolite Sample Reaction System

초임계 이산화탄소-지하수-제올라이트 시료 반응계에서의 지화학적 및 광물학적 변화에 관한 실험적 연구

  • Park, Eundoo (Department of Energy Resources Engineering, Pukyong National University) ;
  • Wang, Sookyun (Department of Energy Resources Engineering, Pukyong National University) ;
  • Lee, Minhee (Department of Earth Environmental Sciences, Pukyong National University)
  • 박은두 (부경대학교 에너지자원공학과) ;
  • 왕수균 (부경대학교 에너지자원공학과) ;
  • 이민희 (부경대학교 지구환경과학과)
  • Received : 2014.04.11
  • Accepted : 2014.06.19
  • Published : 2014.08.28

Abstract

In this study, a series of autoclave experiments were conducted in order to investigate the geochemical and mineralogical effects of carbon dioxide on deep subsurface environments. High pressure and temperature conditions of $50^{\circ}C$ and 100 bar, which are representative environments for geological $CO_2$ sequestration, were created in stainless-steel autoclaves for simulating the interactions in the $scCO_2$-groundwater-mineral reaction system. Zeolite, a widespread mineral in Pohang Basin where many researches have been focused as a candidate for geological $CO_2$ sequestration, and groundwater sampled from an 800 m depth aquifer were applied in the experiments. Geochemical and mineralogical alterations after 30 days of $scCO_2$-groundwater-zeolite sample reactions were quantitatively examined by XRD, XRF, and ICP-OES investigations. The results suggested that dissolution of zeolite sample was enhanced under the acidic condition induced by dissolution of $scCO_2$. As the cation concentrations released from zeolite sample increase, $H^+$ in groundwater was consumed and pH increases up to 10.35 after 10 days of reaction. While cation concentrations showed increasing trends in groundwater due to dissolution of the zeolite sample, Si concentrations decreased due to precipitation of amorphous silicate, and Ca concentrations decreased due to cation exchange and re-precipitation of calcite. Through the reaction experiments, it was observed that introduction of $CO_2$ could make alterations in dissolution characteristics of minerals, chemical compositions and properties of groundwater, and mineral compositions of aquifer materials. Results also showed that geochemical reactions such as cation exchange or dissolution/precipitation of minerals could play an important role to affect physical and chemical characteristics of geologic formations and groundwater.

Keywords

carbon dioxide;zeolite;high pressure and temperature;geochemical reaction;dissolution

Acknowledgement

Supported by : 부경대학교

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