30 countries with highest proven oil reserves(11-20)

11. Nigeria
Proven reserve: 37,200,000,000 billion barrels
Nigeria is heavily dependent on the oil sector, which accounts for 95 per cent of its export revenues.
Pipeline vandalism, kidnappings, and militant takeover of oil facilities have reduced production.
12. Kazakhstan
Proven reserve: 30,000,000,000 billion barrels
According to experts, expansion of oil production and the development of new fields will enable the country to produce as much as 3 million barrels (480,000 m3) per day by 2015.
Kazakhstan would then be among the top 10 oil-producing nations in the world.

13. Qatar
Proven reserve: 25,410,000,000 billion barrels
Oil and gas have made Qatar one of the highest per-capita income countries, and one of the world's fastest growing.
Qatar's proved reserves of natural gas are nearly 26 trillion cubic metres, about 14% of the world total and the third largest in the world.
14. China 
Proven reserve: 20,350,000,000 billion barrels
China's ability to provide for its own needs is limited by the fact that its proven oil reserves are small in relation to its consumption.
At current production rates, they are likely to last for less than two decades.
15. United States 
Proven reserve: 19,120,000,000 billion barrels
In 2010, oil was the largest import commodity in the US.
Altogether, the government owns 28.8 per cent of the country's land area.
Most of this is protected, though some is leased for oil and gas drilling, mining,
Net imports of oil and products account for nearly half of the US trade deficit.
16. Brazil
Proven reserve: 14,240,000,000 billion barrels
Brazil is expected to become a major oil producer and exporter, having recently made huge oil discoveries.
The governmental agencies responsible for the energy policy are the Ministry of Mines and Energy, the National Council for Energy Policy, the National Agency of Petroleum, Natural Gas and Biofuels, and the National Agency of Electricity.
17. Azerbaijan
Proven reserve: 14,000,000,000 billion barrels
Two thirds of Azerbaijan is rich in oil and natural gas.
In September 1994, a 30-year contract was signed between the State Oil Company of Azerbaijan Republic and 13 oil companies, among them Amoco, BP, ExxonMobil, Lukoil and Statoil.
As Western oil companies are able to tap deepwater oilfields untouched by the Soviet exploitation, Azerbaijan is considered one of the most important spots in the world for oil exploration and development.
18. Angola   
Proven reserve: 13,500,000,000 billion barrels
Diamonds and oil make up 60 per cent of Angola's economy, almost all of the country's revenue and are its dominant exports.
Growth is almost entirely driven by rising oil production.
Control of the oil industry is consolidated in Sonangol Group, a conglomerate owned by the Angolan government.
19. Algeria
Proven reserve: 12,200,000,000 billion barrels
Estimates suggest that the actual amount of reserve is even more.
The fossil fuels energy sector is the backbone of Algeria's economy, accounting for roughly 60 per cent of budget revenues, 30 per cent of GDP, and over 95 per cent of export earnings.
20. India
Proven reserve: 9,000,000,000 billion barrels
India has begun the development of a strategic crude oil reserve sized at 37,400,000 barrels, enough for two weeks of consumption.
On December 21, 2011, it was announced that India planned to greatly augment their crude reserve capacity to 132 million barrels by 2020, a senior oil ministry official stated.
Petroleum stocks have been transferred from the Indian Oil Corporation to the Oil Industry Development Board.
The OIDB then created the Indian Strategic Petroleum Reserves Ltd to serve as the controlling government agency for the strategic reserve.
The facilities are:
Mangalore, State of Karnataka.
Padur village, Udipi in the state of Karnataka
Visakhapatnam, Andhra Pradesh