In which one of the following States are the major oil fields located?

The correct answer is Assam. Key Points Petroleum raising states of India are Maharashtra (Mumbai High), Gujarat, Assam, Tamil Nadu, Arunachal Pradesh. Assam, Gujarat and Rajasthan, together account for more than 96% of oil from onshore fields. Assam is the oldest oil-producing state in India and has major oil fields of India located. Following are some of the important oilfields of Assam: The Digboi field (oldest field), The Naharkatiya field, The Moran-Hugrijan field, Rudrasagar, Galecki, Hugrijan, Angui and Lakwa fields. In Rajasthan, one of the largest oil discoveries was made in the Barmer district in 2004. In Bihar, there is only an oil refinery established at Barauni. It refines crude oil supplied from the Naharkatiya oil field of Assam. The Cauvery River basin has 21 oil wells located in it.