He was speaking at a carbon dioxide seminar organized by Norway's Ministry of Petroleum and Energy.
The same meeting was presented with a report on opportunities and challenges relating to carbon dioxide injection for improved oil recovery (IOR) on the Norwegian continental shelf.
This document has been compiled by the Norwegian Petroleum Directorate (NPD), with contributions from Statoil.
"We're working actively on carbon storage in sub-surface structures," said Mr. Fjaeran.
"Using carbon dioxide for IOR is very challenging because it requires stable access to large volumes of the gas, costs are very high and the resource potential is uncertain."
Statoil currently stores carbon dioxide below ground on its Sleipner East field in the North Sea and the In Salah gas field in Algeria.
Plans also call for this greenhouse gas to be separated from the Sn°hvit wellstream in the Barents Sea, which begins to flow next year, and injected into a sub-surface formation.
Statoil's Gullfaks development is the only Norwegian field where a detailed study has been made of using carbon dioxide for IOR.
However, this project was shelved because carbon injection cannot compete with water or gas as a drive mechanism, Mr. Fjaeran emphasized.
The Gullfaks organisation received the NPD's prize for IOR in 2004 for such measures as using new downhole technology, new wells and phasing in satellites.
This field currently has a recovery factor of more than 50 percent, but Statoil's goal is to increase that proportion to at least 62 percent.
The group's Statfjord late-life project will help to raise the recovery factor on this North Sea field to almost 70 percent for oil, and from 53 percent to 75 percent for gas.
"In the long term, it could be possible to realize the use of carbon injection to boost recovery," said Mr. Fjaeran. "So we are investing in research to reduce the cost of carbon capture."
The group is also participating in a number of research activities to qualify the storage of carbon dioxide as a good environmental measure.
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