1. Bombay High
  2. Digboi
  3. Ankleshwar
  4. Naharkatiya
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Answer: Option 2

Digboi oil fields of India is the oldest and still producing oil. Digboi has the distinction of being India's oldest continuously producing oilfield. Digboi refinery, now a division of Indian Oil Corporation, had a capacity of about 0.65 MMTPA as of 2003. The Digboi refinery is the world's oldest oil refinery still in operation.

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