Troll is a
natural gas and
oil field in the
Norwegian sector of the
North Sea, one of the biggest in the North Sea, holding 40% of Norway’s gas – it also possesses significant quantities of oil, in thin zones under the gas cap, to the west of the field. The field as a whole consists of the main Troll East and Troll West structures in blocks 31/2, 31/3, 31/5 and 31/6, about west of
Kollsnes, near
Bergen. Most of the gas lies in Troll East.