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Encyclopedia > Oil fields
Drilling rig in a small oil field
Near Sarnia, Ontario, 2001

An oil field is an area with an abundance of oil wells extracting petroleum (oil) from below ground. Because the underground formations containing oil typically extend over a large area, possibly several hundred kilometres across, full exploitation entails multiple wells scattered across the area. In addition, there may be exploratory wells probing the edges, pipelines to transport the oil elsewhere, and support facilities.

Because an oil field may be remote from civilization, establishing a field is often an extremely complicated exercise in logistics. For instance, workers have to work there for months or years and require housing. In turn, housing and equipment require electricity and water. Pipelines in cold areas may need to be heated. Excess natural gas needs to be burned off if there is no way to make use of it, requiring a furnace and stacks, and pipes to carry it from well to furnace.

Thus, the typical oil field resembles a small self-contained city in the midst of a landscape dotted with drilling rigs and/or the pump jacks known as "nodding donkeys" because of their bobbing arm. Several companies, such as Bechtel and Halliburton, have organizations that specialize in the large-scale construction of the infrastructure required to operate a field profitably.

More than 40,000 oil fields are scattered around the globe, on land and offshore. The largest are the Ghawar Field in Saudi Arabia and the Burgan Field in Kuwait, with more than 60 billion barrels (10 km≥) estimated in each. Most oil fields are much smaller.

In the modern age, the location and proven reserves of oil fields are a key underlying factor in many geopolitical conflicts.

See also

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