The Gum Deniz field is located offshore 21 km SW of Baku. Development of this field began in 1955. The field consists of pay zones of the Balakhany, Pereryv, Girmekiustu, and Girmekialti strata. 491 wells were drilled from the time the field went into development up to April 1, 2011. The field covers an area 145 km2. Cumulative production as of January 1, 2011 was 28,993 tons.