The field was discovered in 1963, and owned by state-owned National Iranian Oil Company (NIOC) and operated by National Iranian South Oil Company (NISOC).

[1] The Marun field contains estimated recoverable oil reserves of 22 billion barrels making it the world's sixth biggest onshore oil field in the world.

[4] The smaller Kupal oil field and Shadegan oil field, located north and south of Marun.

The Marun field was brought on stream in 1966 and its production gradually raised to more than one million barrels of oil a day in 1972.

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