<Li> Germany--Germany and the Netherlands share a quadrant and block grid--quadrants are given letters rather than numbers . The blocks are 10 minutes latitude by 20 minutes longitude . Germany has the smallest sector in the North Sea . </Li> <Li> Netherlands--The Dutch sector is located in the Southern Gas Basin and shares a grid pattern with Germany . </Li> <P> The British and Norwegian sections hold most of the remainder of the large oil reserves . It is estimated that the Norwegian section alone contains 54% of the sea's oil reserves and 45% of its gas reserves . More than half of the North Sea oil reserves have been extracted, according to official sources in both Norway and the UK . For Norway, the Norwegian Petroleum Directorate gives a figure of 4,601 million cubic metres of oil (corresponding to 29 billion barrels) for the Norwegian North Sea alone (excluding smaller reserves in Norwegian Sea and Barents Sea) of which 2,778 million cubic metres (60%) has already been produced prior to January 2007 . UK sources give a range of estimates of reserves, but even using the most optimistic "maximum" estimate of ultimate recovery, 76% had been recovered at end 2010 . Note the UK figure includes fields which are not in the North Sea (onshore, West of Shetland). </P> <P> United Kingdom Continental Shelf production was 137 million tonnes of oil and 105 billion m3 of gas in 1999 . (1 tonne of crude oil converts to 7.5 barrels). The Danish explorations of Cenozoic stratigraphy, undertaken in the 1990s, showed petroleum rich reserves in the northern Danish sector, especially the Central Graben area . The Dutch area of the North Sea followed through with onshore and offshore gas exploration, and well creation . </P>

Where are large deposits of oil located in western europe