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The National oil Company made its own surveys which continued for over two decades and only came to a halt after the imposition of punitive U.N. trade sanctions in 1990.

During the same period major oil firms like ExxonMobil, Japex (Japan Petroleum Exploration), Ascom, Petronas and Repsol made extensive surveys through joint agreements signed with the Ministry of Oil.

The reports of all these surveys, which are part of the Oil Ministry