The major producers of oil are divided into:
1. Areas in North-East India
2. Oilfields in western India
1. Oilfields in North-East India
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(a) Assam is the oldest oil producing area and the important oilfields are:
(i) Naharkatiya Oilfield
(ii) Digboi Oilfield
(iii) Moran-Hugrijan Oilfield
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The oilfields are very far from the areas which consume oil and it is refined in Digboi, Guwahati, Barauni, etc.
(b) Arunachal Pradesh
(c) Tripura
2. Oilfields of Western India
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Gujarat
The main oilfield is Ankaleshwar and it is refined at Trombay and Koyali refineries. The other oilfields at Gujarat are Khambat or Lunej and Ahmedabad oilfields.
Mumbai High
This is situated on the continental shelf 176 kms northwest of Mumbai. Oil is taken out with the help of a platform known as Sagar Samrat. The greatest success achieved by the ONGC is the discovery of a large amount of oil here.
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Bassein
It is located south of Mumbai High. Huge reserves have been found here and the production is expected to pick up fast.
Aliapet
It is located in the Gulf of Khambat. Oil has also been discovered in the Cauvery Basin and the Krishna-Godavari Basin also.