Explanation: Assam, located in the northeastern part of India, is renowned for its rich oil reserves and significant contributions to the country's oil industry. The state's oil industry dates back to the early 20th century, with the discovery of oil in Digboi, which is often referred to as the "Cradle of Indian Oil Industry." Over the years, Assam has developed a robust infrastructure to support the exploration, extraction, and refining of crude oil.
The oil refineries in Assam play a crucial role in processing crude oil into various petroleum products such as gasoline, diesel, kerosene, and lubricants. These products are not only essential for the local economy but also contribute significantly to the national energy supply. The four oil refineries in Assam are:
1. **Digboi Refinery**: Located in the Tinsukia district, this refinery is one of the oldest in Asia and has a significant historical and cultural importance. It processes crude oil from the nearby oil fields and has a refining capacity of around 0.7 million metric tons per year.
2. **Bongaigaon Refinery**: Situated in the Bongaigaon district, this refinery is one of the major refineries in Assam. It has a refining capacity of approximately 2.6 million metric tons per year and processes crude oil from the Brahmaputra Valley.
3. **Guwahati Refinery**: Located in the Kamrup district, this refinery is a smaller facility with a refining capacity of around 0.5 million metric tons per year. It primarily serves the local market and supports the regional energy needs.
4. **Numaligarh Refinery**: This refinery, located in the Dibrugarh district, is one of the largest in the northeastern region of India. It has a refining capacity of about 3 million metric tons per year and processes crude oil from the Numaligarh oil fields.
These refineries are managed by various oil companies, including Indian Oil Corporation (IOC) and Numaligarh Refinery Limited (NRL). The presence of these refineries not only supports the local economy by providing employment opportunities but also ensures a steady supply of petroleum products to the region and beyond.
Understanding the number and location of oil refineries in Assam is important for students and professionals interested in the oil and gas industry, as well as those preparing for competitive examinations that cover Indian geography and economics. The correct number of oil refineries in Assam is 4, reflecting the state's significant but not overwhelming role in the national oil refining sector.