This poster was presented at the Cranfield Biannual, 21.04.15. Grant number: UKCCSRC-C1-14. The data consists of a poster presented at the UKCCSRC biannual meeting in Cranfield, April 20th 2015. The poster describes an overview of work carried-out on behalf of the 'Fault seal controls on CO2 storage capacity in aquifers' project funded by the UKCCS Research Centre, grant number UKCCSRC-C1-14. Three main work strands are briefly described: 1) The Captain Sandstone aquifer is studied for the geomechanical integrity of faults, 2) Shallow gas accumulations in the Netherlands sector of the Southern North Sea provide an opportunity to study their coincidence with faulting while commonalities in the nature of the faults provide an indication of factors that might lead to fault leakage in CO2 storage sites. 3) The Fizzy gas field which is naturally rich in CO2 is studied for its fault seal potential as a natural analogue for fault-bounded storage sites.