Question

The famous Digboi, Naharkatiya petroleum deposits are in the state of _________.
1. Tamil Nadu
2. Andhra Pradesh
3. Maharashtra
4. Assam

Answer 1

Hint:
Petrol deposits are found in the place where ancient seas are located and in vast underground reservoirs. The reservoirs of petroleum are found beneath the land or the ocean floor.

Complete answer:
Oil has always been a determining factor in the relation between state and the central; it plays an important role in Assam politics. The digboi oil field is the oldest field since 1866.

The commercial exploitation of oil and gas is carried in the northeastern region extending over the Upper Assam Valley, the West Rajasthan Basin, the Mumbai High offshore region, and Nagaland.

Assams well-known oil fields are Moran, Rudrasagar, Lakhmani, Galeki, Borholla-Changpan, Hugrijan, and Naharkatiya. The principal reservoirs in the oil basin are the sandstone in Tipam groups and Barail.

In India, the first oil refinery was set up in Digboi, a town in the Tinsukia district of Assam. Digboi is known as the city of oil. The oil refinery was started in and around the year 1901. Naharkatiya is a town district in Assam, and it is well known for gas reserves and petroleum.

Therefore the answer is 4. Assam

Note:
Due to a large number of gas and oil seepage, the Northeast part of India had drawn the attention of many geologists from the year 1825.
In the upper Assam, the major oil accumulations are known in the Miocene age, Tipam Groups of Oligocene and Barail.