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Different estimates may or may not include oil shale, mined oil sands or natural gas liquids. Because proven reserves include oil recoverable under current economic conditions, nations may see large increases in proven reserves when known, but previously uneconomic deposits become economic to develop.
This list of oil fields includes some major oil fields of the past and present. Countries by proven oil reserves 2017. The list is incomplete; there are more than 25,000 oil and gas fields of all sizes in the world. [1] However, 94 % of known oil is concentrated in fewer than 1,500 giant and major fields. [2]
The United States has the largest known deposits of oil shale in the world, according to the Bureau of Land Management and holds an estimated 2.175 trillion barrels (345.8 km 3) of potentially recoverable oil. [21] Oil shale does not actually contain oil, but a waxy oil precursor known as kerogen.
Measuring 280 by 30 km (170 by 19 mi) (some 8,400 square kilometres (3,200 sq mi)), it is by far the largest conventional oil field in the world, [1] and accounts for roughly a third of the cumulative oil production of Saudi Arabia as of 2018. [2] [3] Ghawar is entirely owned and operated by Saudi Aramco, the state-run Saudi oil company. In ...
Prudhoe Bay Oil Field is a large oil field on Alaska's North Slope.It is the largest oil field in North America, covering 213,543 acres (86,418 ha) and originally contained approximately 25 billion barrels (4.0 × 10 9 m 3) of oil. [1]
For a kerogen deposit to be even remotely feasible, the U.S. Department of Energy estimates that the formation would need to be at least 15 feet thick and yield more than 15 gallons per ton of rock.
The world's 932 giant oil and gas fields are considered those with 500 million barrels (79,000,000 m 3) of ultimately recoverable oil or gas equivalent. [1] Geoscientists believe these giants account for 40 percent of the world's petroleum reserves .
According to these studies, three largest oil-shale deposits — all are part of the Green River Formation — are the Piceance Basin with 1.525157 trillion barrels (2.424806 × 10 11 cubic metres), [22] the Greater Green River Basin with 1.444992 trillion barrels (2.297354 × 10 11 cubic metres), [23] and the Uinta Basin with 1.318964 trillion ...