Ayn Dar Oil Field is an oil field located west of Buqayq City in the Eastern Province of the Kingdom of Saudi Arabia . The drilling rig was first used at Ayn Dar Well No. (One) on April 10, 1948. Significant oil reserves were discovered on July 22, 1948, at a depth of two km in the Arab 'D' zone. A second well was drilled five km south of the first well, and by the end of that year, drilling at Ayn Dar Well No. (Three), located another five km further south, was still ongoing. Expansi...