Appendix G. Development Times Assumptions

CO2 storage development time is a critical parameter for any CCS strategy definition. Similarly to the cost modelling, a development time model has been developed for each step of the CO2 storage development workflows presented in part 4.

The proposed development time modelling for aquifer and depleted fields storage projects has been assessed through internal review by Geogreen, and challenges through discussions with Global CCS Institute and IEA GHG experts.

Each item corresponds to a step of the development time workflow. It is very difficult to assess regionally the minimum and maximum development time for each value. For instance, the licensing phase time depends on the local regulation. As we could not enter into this level of detail and for the sake of simplicity, we defined ranges of time necessary for each steps. We represented these ranges by assigning uniform distributions.

The workflow methodology we developed shows sequential actions: one action can be performed only one the previous one is completed. This has been done for modelling purpose and do not represent exactly the reality. Indeed, some action can be performed or start before the end of another one. We included this overlapping aspect in our time evaluation.

Table 19 and Table 20 on next pages show the time modelling assumptions for onshore and offshore Deep Saline Formation respectively. For Depleted Oil and Gas Fields, the same values are supposed for the relevant time items (see workflows in part 4.4.1 page 79).

Finally, as mentioned previously, the overall results of this time modelling can be seen in part 4 and in Appendix H.

Table 19: Development Time per Step for Onshore DSF Project

Table 20: Development Time per Step for Offshore DSF Project