Troll gas field
| Company type | Joint venture |
|---|---|
| Industry | Oil and gas industry |
| Founded | 1995 |
| Headquarters | Norway |
Area served | North Sea |
Key people | Equinor (operator, 30.58%), Petoro (56%), Shell plc (8.1%), ConocoPhillips (1.62%), TotalEnergies (3.69%) |
| Products | Oil, natural gas |
Troll represents a significant oil and natural gas reservoir situated within Norway's sector of the North Sea, accounting for 40% of the nation's natural gas reserves. Beneath the gas cap in its western section, substantial oil accumulations are also present. The field encompasses the primary Troll East and Troll West formations, distributed over blocks 31/2, 31/3, 31/5, and 31/6, positioned approximately west of Kollsnes, close to Bergen. The majority of gas extraction is sourced from Troll East.
Operators
The field's operation is managed by Equinor, holding a 30.58% share. Other stakeholders include Petoro with 56%, Shell plc owning 8.1%, ConocoPhillips at 1.62%, and TotalEnergies possessing 3.69%.
Platforms
Production activities are carried out through three platforms: Troll A, Troll B, and Troll C.
The Troll A platform, constructed using Condeep technology, stands as the tallest movable structure worldwide, with a weight of 656,000 tons and an overall height of ; its legs reach down to beneath the sea surface. After being transported from Rogaland in 1995, it commenced production in 1996.
The Troll B platform is a distinct concrete semi-submersible facility engineered by Doris, which began operations in 1995.
The Troll C platform features a traditional steel hull semi-submersible design by GVA Consultants and started producing hydrocarbons in 1999.
Area
Covering just over 700 square kilometres across four North Sea blocks, the field's extent is comparable to approximately 100,000 football fields.
Geology
The reservoir is situated roughly 1,500 meters below sea level within three fault blocks that tilt eastward. It consists of cyclic shallow-marine sandstone deposits from the Jurassic Viking Group, specifically the Fensfjord, middle and upper sections of the Heather, and Sognefjord formations. These are overlain by clay layers dating from the Upper Jurassic to the Paleocene. Positioned on the eastern edge of the Viking Graben, water depths in this area vary between 300 and 355 meters.