- Bombay High, with an average production of 2.6 lakh barrels of oil per day, supplies, 14% of India's requirements and accounts for 38% of the country's domestic production.
- ONGC began drilling in Bombay High, India's largest offshore fields, with Sagar Samrat in 1973 and the firm has drilled 125 wells so far.
- The fields, situated 160 km off the Mumbai coast, were discovered by an Indo-Russian team while mapping of the Gulf of Cambay in 1964-67.
- In the '90s, production declined from 20 million tonnes a year to 12 million tonnes, forcing ONGC to kick off a $1.6 billion plan in '01 to drill an additional 1.5 million barrels over the next decade.