Geir Evensen

GeirEvensen_IRIS

Geir Evensen’s invention has made a huge contribution to value creation on the Norwegian Shelf. (Photo: Norce)

10/07/2020 For many years, Geir Evensen has delivered invaluable efforts in the development of ensemble-based modelling methods. These methods have contributed to enormous value creation on the Norwegian Shelf.

Evensen invented the Ensemble Kalman Filter (EnKF) algorithm in 1994 when he was a researcher at the Nansen Center. The method was originally developed for use in weather and sea forecasting. EnKF-based methods also proved to function extremely well within reservoir modelling and simulation in the petroleum industry, and are now used extensively across the globe.

Using automation and rapid and continuous updates of the reservoir models, ensemble-based methods have resulted in better understanding of the subsurface. Updated and correct information provides oil companies with a better basis for making decisions before they drill new wells or implement various IOR measures. According to the jury, the method can also yield substantial cost reductions, in part through reducing the number of wells.
In the 2000s, Geir Evensen led the work of implementing EnKF in Equinor’s Fast Model Update tool.

Evensen is now chief scientist at the Norwegian Research Centre NORCE, where his tasks include leading a Petromaks 2 project for further development of ensemble methods in petroleum applications. He also works with adapting modelling methods for new areas, such as the health sector and climate forecasting.

 

 

Updated: 10/07/2020

Latest news

Drilling permit for well 30/3-11 S
23/05/2022 The Norwegian Petroleum Directorate (NPD) has granted Equinor Energy AS drilling permit for well 30/3-11 S, cf. Section 13 of the Resource Management Regulations.
Drilling permit for well 6507/3-15 and 6507/3-16
23/05/2022 The Norwegian Petroleum Directorate (NPD) has granted Aker BP ASA drilling permit for well 6507/3-15 og 6507/3-16, cf. Section 13 of the Resource Management Regulations.
Production figures April 2022
20/05/2022 Preliminary production figures for April 2022 show an average daily production of 1 871 000 barrels of oil, NGL and condensate,
Mapping offshore wind
13/05/2022 The Ministry of Petroleum and Energy (MPE) has given the Norwegian Petroleum Directorate (NPD) an assignment to conduct surveys in connection with awarding acreage for offshore wind.
Delineation of oil and gas discovery near the Gjøa field in the North Sea – 35/9-16 S and 35/9-16 A
12/05/2022 Neptune Energy Norge AS, operator of production licence 153, has concluded the drilling of appraisal wells 35/9-16 S and 35/9-16 A on oil and gas discovery 35/9-3 (Hamlet).
Dry well southeast of the Knarr field in the North Sea – 35/4-3
12/05/2022 Aker BP ASA, operator of production licence 685, has concluded the drilling of wildcat well 35/4-3.
Drilling permit for well 6507/4-3 S
27/04/2022 The Norwegian Petroleum Directorate (NPD) has granted ConocoPhillips Skandinavia AS drilling permit for well 6507/4-3 S, cf. Section 13 of the Resource Management Regulations.
Guidelines for interpreted data
25/04/2022 The Norwegian Petroleum Directorate (NPD) has now prepared guidelines that clarify the term 'interpreted data'. The guidelines contain a definition of the term and describe what 'interpreted data' shall mean.
Production figures March 2022
21/04/2022 Preliminary production figures for March 2022 show an average daily production of 1 960 000 barrels of oil, NGL and condensate.
Green light for Hod B
20/04/2022 The authorities have granted Aker BP consent to start up the Hod B facility in the North Sea.