Kirkuk is a supergiant oil reservoir located in Iraq. From 1961 to 1971, 3.2 billion bbl of oil were produced under pressure maintenance by waterdrive using river water. The 1971 production rate was approximately 1.1 million barrels of oil per day (BOPD). Since then, the field has continued to produce large volumes of oil by voidage-replacement water injection; however, few production details for recent years appear in the technical literature. The primary pay interval for the Kirkuk field is the 1,200-ft-thick Main Limestone.