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

The correct answer is Assam . Key Points Major oil fields in India With over 100 oilfields, Assam leads as the state with the greatest number of oilfields. Assam has major oilfields like Digboi, Naharkatiya, and Moran-Hugrijan. Bihar hardly has any oilfield; Tamil Nadu has a coal mine at Neyveli and reserves of natural gas and nothing else. Rajasthan, like Bihar, is yet to discover whether it has any oil deposits. Petroleum has an organic origin and is found in sedimentary basins , shallow depressions, and the seas (past and present). Most of the oil reserves in India are associated with anticlines and fault traps in the sedimentary rock formations of tertiary times, about 3 million years ago. The major oilfields in north-eastern India are those of Brahmaputra valley of north-east India and its neighboring areas including Arunachal Pradesh, Nagaland, Tripura, Manipur, Mizoram, and Meghalaya. Major oil fields Assam It is the oldest oil-producing state in India The Naharkatiya field : Oil from this area is sent to oil refineries at Noonamati in Assam and Barauni in Bihar through the pipeline. It was discovered in 1953. Digboi - It is the oldest oil field in India. Digboi oilfield was the only petroleum-producing area of India till the 1950s. The oil from here is refined in the Digboi refinery. Moran-Hugirijang - The oilfield is located on the Brahmaputra river valley. The oil from here is transported to the Barauni refinery in Bihar. Rudrasagar-Lakwa - The oilfield is located in the Sibasagar district in the state of Assam in the Brahmaputra river valley. Surma Valley - The Badarpur, the Patharia, and the Masimpur are the major oilfields in the Surma valley. Distribution in North-East other than Assam state Nigru region - The oilfield is located in Tirap district in the state of Arunachal Pradesh. Borholla region - The oilfield is located across the border of Assam-Nagaland.