About CCS

Storage capacity - estimation

CO2 storage capacity is an estimate of the amount of CO2 that can be stored in subsurface geological formations. It is influenced by the density of CO2 at subsurface conditions, the amount of interconnected pore volume of the reservoir rock and the nature of the formation fluids.

Storage capacity estimation in saline formations

The mass estimate of CO2 storage capacity is a calculation based on

  • the geographical area that defines the region for storage;
  • the thickness of the saline formation;
  • the average total porosity of the entire saline formation;
  • the density of CO2 at the relevant temperature and pressure;
  • how much of the region has a suitable formation;
  • how much of the formation meets minimum porosity and permeability requirements for injection;
  • how interconnected the formation is;
  • what area surrounding an injection well can be contacted by CO2;
  • porosity and permeability variation in sub layers in the formation;
  • how much of the formation will be contacted by CO2 as CO2 rises due to a density difference with water; and
  • how much of the water will be replace by CO2 in the pore space.

Storage capacity estimation in depleted oil and gas formations

Unlike saline formations, oil and gas fields can be considered as discrete systems. The mass estimate of CO2 storage capacity is a calculation based on:

  • the geographical area that defines the region for storage;
  • the hydrocarbon column height in the reservoir;
  • the type of trap;
  • the average porosity over the column height;
  • the density of CO2 at the relevant temperature and pressure; and
  • the fraction of the pore volume from which oil/gas has been produced and can be filled by CO2.

Another method of estimating the storage capacity is to estimate the volume of CO2 which can be stored per stock tank barrel of original oil in place.

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