Fault seal analysis of a natural CO2 reservoir

J. Miocic, G. Johnson, S. M V Gilfillan, C. I. McDermott, R. S. Haszeldine

Research output: Contribution to conferencePaperpeer-review


For potential CO2 storage sites it is crucial to know if faults will act as flow baffles or if CO2 will be able to migrate out of the reservoir complex. Geomechanical fault seal analysis for a CO2 reservoirs is very similar to hydrocarbon reservoirs. However, fault rock seals have the potential to act very different in a CO2-rock-water system compared to a hydrocarbon-rock-water system. Natural CO2 reservoirs are common in sedimentary basins world-wide and here we present the results of a fault seal analysis, with emphasis on juxtaposition and fault rock seals, of a natural CO2 reservoir from the Colorado Plateau. The reservoir has leaked CO2 for more than 350 ka along faults. Our results show that the existing gas column can overcome the capillary entry pressure of the fault rocks, leading to migration of CO2 to the surface. Additionally, the fault is orientated favourable for reactivation in the current stress field.
Original languageEnglish
Number of pages5
Publication statusPublished - 24 Sep 2015
Event4th International Conference on Fault and Top Seals 2015 : Art or Science - Almeria, Spain
Duration: 20 Sep 201524 Sep 2015


Conference4th International Conference on Fault and Top Seals 2015 : Art or Science


  • natural CO2 reservoir
  • fault seal analysis
  • CO2 storage

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