upOil from the Heidrun field. The Heidrun oil field is an oil and gas field discovered in 1985 in the Norwegian sector of the

Norwegian Sea The Norwegian Sea (; ; ) is a marginal sea, grouped with either the Atlantic Ocean or the Arctic Ocean, northwest of Norway between the North Sea and the Greenland Sea, adjoining the Barents Sea to the northeast. In the southwest, it is separate ...

, named after the goat

Heiðrún Heiðrún or Heidrun is a nanny goat in Norse mythology, that consumes the foliage of the tree Læraðr and produces mead from her udders for the einherjar. She is described in the ''Poetic Edda'' and ''Prose Edda''. Etymology The etymology ...

from

Norse mythology Norse, Nordic, or Scandinavian mythology, is the body of myths belonging to the North Germanic peoples, stemming from Old Norse religion and continuing after the Christianization of Scandinavia as the Nordic folklore of the modern period. The ...

. The field lies north of

Kristiansund Kristiansund (, ; historically spelled Christianssund and earlier named Fosna) is a List of municipalities of Norway, municipality on the western coast of Norway in the Nordmøre district of Møre og Romsdal counties of Norway, county. The admin ...

. It has produced

oil An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) and lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturate ...

and

gas Gas is a state of matter that has neither a fixed volume nor a fixed shape and is a compressible fluid. A ''pure gas'' is made up of individual atoms (e.g. a noble gas like neon) or molecules of either a single type of atom ( elements such as ...

since October 1995. In 2013, it produced 65,000 barrel of oil per day and 760 million cubic meters of natural gas.Offshore Technology
/ref> The crude oil is characterized as being

naphthenic In organic chemistry, the cycloalkanes (also called naphthenes, but distinct from naphthalene) are the monocyclic saturated hydrocarbons. In other words, a cycloalkane consists only of hydrogen and carbon atoms arranged in a structure containing ...

with 25.0 API (0.9043 g/cm³), 0.52% sulfur, and a high TAN (

Total Acid Number The total acid number (TAN) is a measurement of acidity that is determined by the amount of potassium hydroxide in milligrams that is needed to neutralize the acids in one gram of oil. It is an important quality measurement of crude oil. The TAN ...

) of 2.90. The Heidrun field is located on Haltenbanken in the Norwegian Sea at a depth of . The field has been developed with gas and water injection, using a floating concrete tension leg platform, installed over a subsea template with 58 well slots. The northern part of the field is developed with subsea facilities.

Geology

The

Cimmerian The Cimmerians were an Ancient Iranian peoples, ancient Eastern Iranian languages, Eastern Iranian peoples, Iranic Eurasian nomads, equestrian nomadic people originating in the Pontic–Caspian steppe, part of whom subsequently migrated into W ...

structure is a southwest-plunging horst block on the southwest flank of the Nordland ridge formed in the Late

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

-Early

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

. Production is from Jurassic Fangst Group

sandstones Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed o ...

with the Upper Jurassic Spekk Formation

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of Clay mineral, clay minerals (hydrous aluminium phyllosilicates, e.g., Kaolinite, kaolin, aluminium, Al2Silicon, Si2Oxygen, O5(hydroxide, OH)4) and tiny f ...

s being the petroleum source and Cretaceous shales forming the seal.

References

External links

Heidrun Facts and Interactive map

Heidrun field development
Information on Heidrun platform
Heidrun Field Map & Images
{{gasfield-stub Oil fields in Norway Natural gas fields in Norway Horsts (geology)