[[1]] is the oldest oil producing state in India.

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Detailed Solution

Assam is the oldest oil-producing state in India. Petroleum is a conventional source of energy which implies that if it is completely used once, it can’t be regenerated again at the moment of need. The first drilling of petroleum was done in Digboi, Assam for the extraction of petroleum, and this drilling was done in the year 1901. At present, there are some more oil fields including Mumbai High which is the largest oil field in India, then Ankleshwar the most important oil field in Gujarat.

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