Which of the following states is the oldest producer of oil?

Oil and Gas are fossil fuels that are found in some states of India. Oil and gas are the major sources of energy in India after coal. Government companies like ONGC have a major share in the production of oil and gas and the private sector has a share of about 30%. Key Points Assam is the oldest oil-producing state in India. The main oil-bearing strata extend for a distance of 320 km in upper Assam along the Brahmaputra valley. Following are some of the important oilfields of Assam: The Digboi field: It is the oldest oil field in India. Over 800 oil wells have been drilled so far. Before the opening of the oil fields of west India, Digboi used to account for three-fourths of the total oil production of India. The Naharkatiya field: Here oil was discovered in 1953 and production started in 1954. The annual production is 2.5 million tonnes of oil and one million cubic meters of natural gas. Oil from this area is sent to oil refineries at Noonamati in Assam (443 km) and Barauni in Bihar (724 km) through the pipeline. The Moran-Hugrijan field: Oil at Moran- Hugrijan field was discovered in 1953 and production started in 1956. As many as 20 wells have been drilled which yields oil as well as gas. ​ Hence, the correct answer is Assam.