Oseberg oil field is located in North Sea

Oseberg (Norwegian: Osebergfeltet) is an offshore oil field with a gas cap in the North Sea located 140 km (87 mi) northwest of the city of Bergen on the southwestern coast of Norway. The field, which is 25 km long by 7 km wide,^[2] was discovered in 1979 and its development is known to be one of the significant milestones in emergence of Norway's independent oil and gas industry.^[3][4] The Oseberg field was named after Oseberg ship, one of Norway's most significant archeological discoveries. The ancient Viking ship from the early 9th century was discovered in a 1904 historical excavation of a burial mound at the Oseberg Farm, south of Oslo.^[5]

• http://en.wikipedia.org/wiki/Oseberg oil field