Barrel (unit) continued to use the same size barrels. In the worldwide oil industry, an oil barrel is defined as 42 US gallons, which is about litres or 35 imperial gallons. Oil companies that are listed on American stock exchanges typically report their production in terms of volume and use the units of bbl, Mbbl (one thousand barrels), or MMbbl (one million barrels) and occasionally for widest comprehensive statistics the Gbbl (or sometimes Gbl) denoting a billion. There is a conflict concerning the units for oil barrels (see ). For all other physical quantities, according to the International System of Units, the
Oil reserves in Iraq to international oil companies for some of Iraq's many oil fields. The winning oil companies entered joint ventures with the Iraqi Ministry of Oil, and the terms of the awarded contracts include extraction of oil for a fixed gain of $1.40 per barrel for the oil companies with the remainder going to Iraq. The fees will only be paid once a production threshold set by the Iraqi ministry of oil is reached. Oil fields contracted include the "super-giant" Majnoon Field, Halfaya Field, West Qurna Field and Rumaila Field. The East Baghdad Field, situated in part under Sadr City, did not