An Oil Field is an area of land in which accumulation of liquid Oil trapped by impermeable rock formations underground in multiple reservoirs/layers. Oil fields could extend up to several hundred kilometres on surface. On the ground surface you will see producing well, extraction equipment's setup to handle production and lots of pipelines to transfer the production.

It is estimated that more than 65,000 oil fields are scattered around the globe, on land and offshore.

Here are the 5 largest Oil Fields in the world

1. Ghawar Field, located in Saudi Arabia and discovered in 1948, is the largest Oil field in the world in terms of reserves (96 billion barrels) and daily production (around 4 million b/d). It is 280km long and 40km wide with an estimated thickness of 100 meters.

2. Burgan Field, located in Kuwait and discovered in 1946. It is the 2nd largest Oil field in the world but considered the biggest Sandstone field in the world. Current reserves stand at 67.2 billion barrels and daily production of 1.6 million b/d which accounts for more than half of Kuwait total production.

3. Ahvaz Field, located in Iran and discovered in 1954. It is Iran largest Oil field. Current reserves stand at 65 billion barrels and was producing 750,000 b/d in 2016.

4. Gachsaran Field, located in Iran and discovered in 1930. It is the 2nd largest Oil field in Iran. Its current reserves stand at 52.9 billion barrels and was producing 560,000 b/d. Currently have many Environmental issues like Oil spill and a lot of flaring.

5. Upper Zakum Field, located in the UAE and discovered in 1963. It is developed and operated by a JV. Japan Oil Development Corporation, ADNOC and ExxonMobil. Its reserves stand at 50 billion and production of 640,000 b/d. The Zakum oil field is made up of four man-made islands with the largest measuring 135 football pitches.