ABQAIQ (or Aghajari), the oil field in the Saudi Arabia, one of the largest oil fields in the world. Is part of the Persian Gulf oil and gas basin.

Has been discovered in 1940, is developed since 1946. The initial recoverable oil reserves are 1,207 million tonnes. Is in the conjunction with the anticlinal fold of the 70x20 kilometres in size. The reservoirs are stratified with the high domed layers. The Upper Jurassic limestones are productive down to the depth of 1.7-2.0 kilometres.

The thickness of the developed layer is 60-65 metres. The collector is porous with cracks, the porosity is 20-25%, the permeability is up to 500 millidarcies. The initial reservoir (layer) pressure is 17.8 megapascals, the temperature is 74 degrees Celsius. The density of the oil is 881 kilograms per cubic metre, the viscosity is 13.1 centipoises, the admixture of the S chemical element is 2.8%. There are 52 gusher oil wells in operation, the annual production is 36.2 million tonnes (1980), the cumulative production (1981) is 878 million tonnes.

To maintain the reservoir (layer) pressure, the gas is pumped into the northern part of the oil field, and the water is pumped into the southern part of the oil field. There are the pipelines to the ports of Sidon and Ras Tanura. The oil field is operated by the "Saudi Aramco" oil company.