CCS - SP008

Geological Storage of CO2

Course summary

This course will provide participants with awareness and understanding subsurface CO2 storage volumetrics, CO2 flow in the subsurface away from injector wells, the objective of permanent and safe storage of CO2, and the key issues of reservoir depth, well design, reservoir lithology, reservoir quality, and reservoir architecture. The course will address CO2 as a fluid phase and the key question of CO2 storage efficiency, the equivalent of oil recovery factor. The course will address the rate of CO2 injection and the role reservoir permeability. The all-important issue of the geomechanical effects of CO2 injection and feedbacks between induced mineral dissolution and rock strength and other rock properties will be addressed. The range of possible interaction between CO2 and both aquifer and top-seal will be covered

Learning outcomes

  1. Appreciate the types of CO2 injections projects have occurred so far, and the ones that are planned.
  2. Discuss CCS projects that have been a success and those that have had problems.
  3. Build awareness of the reservoir rocks that store CO2 and the volumetrics of CO2
  4. Appreciate the importance of the storage efficiency factor in controlling how much CO2 can be injected.
  5. Gain an appreciation of the question of the injectivity of CO2 and the roles of permeability and aquifer architecture on CO2

Course content

  • CO2 storage volumes and controls on porosity in sandstone reservoirs
  • CO2 storage volumes and controls on porosity in carbonate reservoirs
  • Risk and rate of mineral dissolution due to CCS: calcite in sandstones and limestones
  • CO2 storage efficiency
  • Injectivity at CCS sites and controls on permeability in potential CCS reservoirs
  • Relative permeability, formation damage, history matching CO2 flow patterns
  • Geomechanical responses to elevated CO2 pressure
  • Risk and rate of mineral precipitation: halite and water salinity plus CCS in basalt
  • Top-seal properties and stability at CCS sites

 

Prerequisites

There are no prerequisites for this course.