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3rd Risk Assessment Network Meeting Report

Technical Report

1 March 2008

Event Proceedings

Storage

IEAGHG

Citation: IEAGHG, "3rd Risk Assessment Network Meeting Report", 2008-01, March 2008.

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Publication Overview

The purpose of the network is to bring together the key groups working on risk assessment for CO₂ storage from around the world and to address what the regulators are expecting in regard to CCS assurance and whether risk assessment can provide the answers they require. This report provides a summary of the third risk assessment workshop hosted by Imperial College in London, UK between the 15th and 16th August 2007.

Publication Summary

  • Estimates of storage capacity derived from the study would be placed in the context of a resource classification scheme. The Carbon Sequestration Leadership Forum (CSLF) resource ‘pyramid’ (Figure 1) was chosen as the example to be used, although this was not to be reported as an endorsement above other similar classification schemes;
  • The study would undertake only a brief review of issues concerning natural gas fields with high CO₂ content and CO₂-EGR (items 1 and 3 on the original scope), since the report authors considered these issues to have limited significance for the overall CO₂
  • Re-use of existing pipelines would not be considered for the source-sink matching and costing elements of the study, since the suitability of such infrastructure would vary according to local factors; global storage potential of gas fields; therefore project resources would be better deployed on storage capacity estimation and cost analysis;
  • Similarly, site-specific geological factors such as caprock and well integrity issues would not be described or directly assessed in the study;
  • Due to the importance of localised factors as described above in assessing the suitability for CO₂ storage of any given gas field, the study would not seek to produce a screening tool for the ranking of gas field prospects (item 4 in the original scope). However a tool to enable regional source-sink matching with respect to time, based on the use of a geographic information system (GIS) would be developed.

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