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Storage Appraisal - Appendix A5.6 - Exemplar Modelling and Dynamic Simulation of Bunter Sandstone Formation Closures in the Southern North Sea

Citation Bentham, M., Williams, J., Harris, S., Jin, M. and Pickup, G. Storage Appraisal - Appendix A5.6 - Exemplar Modelling and Dynamic Simulation of Bunter Sandstone Formation Closures in the Southern North Sea, ETI, 2011.
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Author(s) Bentham, M., Williams, J., Harris, S., Jin, M. and Pickup, G.
Project partner(s) RPS Energy Ltd, Senergy (Lead Coordinator), British Geological Survey, Durham University, Herriot Watt University, Imperial College, University of Edinburgh, Element Energy, Geopressure Technology, Geospatial Research Ltd , Senergy - DB hosting
Publisher ETI
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Abstract This document is a supporting document to deliverable MS6.1 UK Storage Appraisal Final Report.

The aim of this work was to build a 3D geocellular model of the reservoir and sealing formations for a closure in the Bunter Sandstone Formation which could be used to model CO2 injection. A region in storage unit 139.000 (zone 4 Bunter Sandstone Formation) of 44.0 km by 25.2 km was chosen for detailed modelling. The target daughter storage unit 139.016 (Bunter closure 36) was chosen for modelling as:
  • No faulting was visible on the seismic over the closure
  • The storage capacity was estimated to be large enough to store a sizable amount of CO2
  • The area included three additional closures  that could be used to study the impact of CO2 injection on adjacent storage units
  • Data coverage was good over the chosen area
The static geocellular model was constructed by BGS in PETRELTM  using PGS seismic surfaces, IHS well tops (from the EDIN database), well logs (for 12 wells) and core data for one well.

Some important findings arose from this study:-
  • The storage capacity may be controlled by either the pressure (when the pressure increases above the maximum limit, the rate must be reduced), or the migration rate (if a high injection rate is maintained, CO2 will reach the spill point more rapidly).
  • The pore volume utilisation and total capacity are quite sensitive to the assumed value for the fracture pressure gradient. A change in this gradient may switch the storage control from pressure-controlled to rate-controlled.
  • The storage capacity for an open model may be less than that for a closed system, if heterogeneity encourages a low pore volume utilisation.
  • It is import to monitor the pressure at the crest of a dome. Even when the injection rate is pressure controlled at the depth of the well completions, the pressure may rise above a safe limit in the crest.
  • It may be possible to increase storage capacity by controlling the injection rate. A lower rate will allow CO2 more time to rise buoyantly and to dissolve in brine, before reaching the spill point.
Associated Project(s) ETI-CC1001: UK Storage Appraisal Project (UKSAP)
Associated Dataset(s) No associated datasets
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Storage Appraisal - Appendix A3.1 - Storage Unit Characterisation

Storage Appraisal - Appendix A4.1 - Pressure Buildup During CO2 Injection into a Closed Brine Aquifer

Storage Appraisal - Appendix A4.2 - Well Penetrations and Production in Oil and Gas Fields

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Storage Appraisal - Appendix A5.5 - Representative Structure Modelling of Aquifers with Identified Structure

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