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Caprock sealing is relied upon to contain CO2 in the reservoir. There are concerns over CO2 interactions with caprock, such as de-wetting pore water in the caprock and cause the pores to be open to CO2 flow. Adsorption of CO2 in the pore walls may promote the de-wetting. On the other hand, adsorption may cause some clay minerals to swell and result in pore closure. Moreover, reported CO2 adsorption data for a caprock shale suggest that the pore space can be fully filled by adsorbed CO2. This would block the pathway for CO2 leakage. An analysis is shown for this effect.

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Impact of Adsorption on Security and Safety of CO2 Storage

  • 章节

  • 发表日期：

    2025年

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  • Jinsheng Wang,
  • Hanin Samara,
  • Philip Jaeger

摘要

Caprock sealing is relied upon to contain CO2 in the reservoir. There are concerns over CO2 interactions with caprock, such as de-wetting pore water in the caprock and cause the pores to be open to CO2 flow. Adsorption of CO2 in the pore walls may promote the de-wetting. On the other hand, adsorption may cause some clay minerals to swell and result in pore closure. Moreover, reported CO2 adsorption data for a caprock shale suggest that the pore space can be fully filled by adsorbed CO2. This would block the pathway for CO2 leakage. An analysis is shown for this effect.