Production: In about 10 lakh sq. km. oil-bearing rocks are found in India. The oil reserves in India are estimated to be 50 crore metric tons. The first oilfield in India was discovered in 1867 at Makum in Assam. At present the production is as under:
1. Assam: In Assam, oil is produced in Digboi, Moran, Naharkatiya, and Sibsagar regions.
2. Gujarat: In Gujarat, oil is produced in the Gulf of Cambay region at Kalol, Ankleshwar, Lunej, etc.
3. Maharashtra: Oil has struck in the offshore region at Mumbai High along the coast of Mumbai. It is the leading producer of crude oil in India. North Basin and South Basin and Albet islands are the important oil fields.
4. The production of oil in India is increasing everywhere under the organization of the Oil and Natural Gas Commission. The production of oil in India was estimated to be about 210 lakh tonnes in 2001.
