INDIAN GEOGRAPHY

Detailed explanation-1: -The correct answer is Digboi. Digboi in Assam is the oldest oil producing field of India. Naharkatiya and Moran-Hugrijan are other important oil fields in the state.

Detailed explanation-2: -Digboi is known as the Oil City of Assam where the first oil well in Asia was drilled. The first refinery was started here as early as 1901. Digboi has the oldest oil well in operation.

Detailed explanation-3: -Thereafter, systematic drilling began in 1891 and two years later in 1901, Asia’s first oil refinery was set up in at Digboi. It is still functional and world’s oldest operating refinery.

Detailed explanation-4: -Digboi, Assam, is an oil town that dates back to the early 1800s when oil was discovered. Digboi is home to the world’s oldest working oil refinery and a 100-year-old active oilfield.

Detailed explanation-5: -The mega oil company has finished the drilling operations by the country’s first indigenously-made oil drilling rig at Kalol oil fields in Ahmedabad, Gujarat.