Site and Portfolio Selection

D01 – UK CO2 Storage Site Screening and Selection Methodology – 10113ETIS-Rep-01-03

This report documents the screening and selection approach developed for the project to move from an initial inventory of over 570 storage units held within the CO2Stored database down through a “Qualified” and “Select” inventory before a portfolio of five sites was assembled.  The project deployed best guidance from the IEAGHG for saline aquifers and also used some multi criteria problem solving to distil the best twenty sites that mapped on the overall project objectives.

D02 – Data and Information Requirements – 10113ETIS-Rep-02-02

This report considers the data requirement for the project as a whole to enable the execution of the project flow outlined in D01.  Specifically the data enabled the screening and selection process to be delivered, a formal due diligence process to be completed on selected sites using raw subsurface data (both seismic and well information) and the detailed evaluation of five specific sites the identity of which were unknown at the start of the project.  Further consideration included ensuring that the data was available just in time to maintain project schedule and also that the IP associated with the procured data was clear, understood to all parties and fully complied with.  Finally a business justification was prepared for the data procurement.

D04 – Initial Screening & Down-Select – 10113ETIS-Rep-03-2.0

This report documents the results of the selection process from over 570 sites to a recommended “Select” inventory of 20.  This comprised 10 depleted hydrocarbon fields (both oil and gas) and 10 saline aquifers.  15 of the sites were discrete structural closures with 5 being open formations.  Sites are located throughout the geological column and include the East Irish Sea, the Southern and Central North Sea.  The results of this selection were shared, tested and approved with a broad group of Stakeholders on 2nd July 2015 in London

D05 – Due Diligence and Portfolio Selection – 10113ETIS-Rep-07-1.1

This report summarises the results of a technical due diligence on the “Select” inventory of 20 storage sites identified in D04.  For each site, seismic and log data were reviewed to ensure that the criteria which secured the sites’ selection were rooted in evidence and hard data.  In addition, rapid development cost assessment was performed using simple initial development concept to ensure that each site was capable of making a material and cost effective contribution to the objectives of the project.  The portfolio selection was focussed upon ensuring that the collection of 5 sites performed well in the due diligence process and also that they could be materially progressed within the resources available to this study.  Many strong portfolios could have been delivered.  The final recommendation was shared, tested and approved by a third stakeholder event on 29th July 2015.  The resulting portfolio included:-

  • the Triassic Hamilton depleted gas field in the East Irish Sea,
  • the Permian Viking Depleted gas field in the Southern North Sea,
  • the Triassic saline aquifer within a structural Closure known as Bunter Closure 36 from the Southern North Sea,
  • the Captain Sandstone open saline aquifer formation from the Central North Sea and
  • the Forties 5 open saline aquifer formation of the Central North Sea.

D06 – Site Summary Posters – 10113ETIS-Rep-06-02

This report contains a poster for each of the “Select” inventory sites which outlines the key aspects of each storage site, together with a development concept, a capacity, injectivity and containment assessment, preliminary scoping development costs and any commercial issues of concern.  This summary is presented systematically across all twenty sites and forms a record of the due diligence output.

D07 – Forties 5 Aquifer Storage Site Selection Study – 10113ETIS-Rep-08-1.4

The Forties 5 open saline aquifer unit was selected as one of the five CO2 storage sites within the selected portfolio. The sheer size of the unit means that it is not practical to consider the development of the whole site in a single phase. The purpose of this supplementary workscope was to:-

  • Identify through more detailed work an appropriate site to initiate CO2 injection within the Forties 5 unit such that the potential of open saline aquifer systems can be developed and matured.
  • To reconsider those previously eliminated large oil fields of the Central and Northern North Sea which have significant EOR potential as a fall back location, in the unlikely event that a suitable Forties 5 injection site cannot be identified.

The report documents further assessment of 5 regions within the Forties 5 area and identified one of these which offered the strongest combination of storage site potential and low containment risk.


All materials from the Strategic UK CCS Storage Appraisal Project can be accessed here. Readers are advised that the materials are best viewed using Internet Explorer.

Update: On the 9th of June, the Global CCS Institute hosted a webinar on this project, where we provided a more detailed look at the results of this project. To listen to the webinar, click here.

This article was written by Alan James.

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