Long Forties

Long Forties
Long Forties

Long Forties is a zone of the northern North Sea that is fairly consistently forty fathoms (240 ft; 73 m) deep.

Extent

Long Forties are between the northeast coasts of Scotland and the southwest coast of Norway, centred about 57°N 0°30′E; compare to the Broad Fourteens.

Alternative terms

Forties

The Shipping Forecast area Forties approximates to Long Forties, though with neater boundaries. The north of the latter falls in Viking.

Fladen Grounds

Main article: Fladen Grounds

Fladen Grounds is the next more northern, eastern and deeper part of the sea. The Dutch weather service KNMI, and Norwegian equivalent, use their tongues' similar names for and meaning Fladen Grounds instead of Forties and most of Viking. The Swedish weather institute, which reported for this zone until 2005 followed these leads.

Etymology

When depth sounding (originally fathoming with rope and plumb weight), the recorded depth would for a long haul remain 40 fathoms. On a traditional imperial measurements nautical chart, a great zone with many "40"s appears.

Geology

The Forties Oil Field is the largest oil field of the sea, 110 miles (180 km) east of Aberdeen. It was discovered in 1970 and first produced oil in 1975 under ownership of British Petroleum.

The Forties Formation consists of a lower Shale Member and an upper Sandstone Member, which were deposited in a "middle and lower submarine fan environment".[1] The initial development plan included a "complete replacement seawater injection system" starting in 1975.[2] When the field was sold in 2003, reservoir engineers estimated the STOIIP (original oil in place) was 4.2 billion barrels (0.67 cubic kilometres).[3]

See also

References

  1. ^ Hill, P.J., and Wood, G.V., 1980, Geology of the Forties Field, U.K. Continental Shelf, North Sea, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Tulsa: American Association of Petroleum Geologists, ISBN 0891813063, p. 81-82.
  2. ^ Hill, P.J., and Wood, G.V., 1980, Geology of the Forties Field, U.K. Continental Shelf, North Sea, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Tulsa: American Association of Petroleum Geologists, ISBN 0891813063, p. 82.
  3. ^ Hill, P.J., and Wood, G.V., 1980, Geology of the Forties Field, U.K. Continental Shelf, North Sea, in Giant Oil and Gas Fields of the Decade:1968-1978, AAPG Memoir 30, Tulsa: American Association of Petroleum Geologists, ISBN 0891813063, p. 81.

57°00′N 0°30′E / 57.000°N 0.500°E / 57.000; 0.500


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