Examine the role of petroleum as an important source of energy and describe its distribution in India.
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Model Answer
Role of Petroleum as an Energy Source:
Petroleum or mineral oil is the next major energy source in India after coal. It provides fuel for heat and lighting, lubricants for machinery, and raw materials for manufacturing industries. Petroleum refineries act as a "nodal industry" for synthetic textiles, fertilisers and numerous chemical industries, making it vital for industrial development.
Occurrence: Most petroleum in India is associated with anticlines and fault traps in tertiary rock formations. Oil is trapped in porous limestone or sandstone layers between non-porous rocks.
Distribution in India:
- Mumbai High – largest offshore producer
- Gujarat – Ankeleshwar is the most important oilfield
- Assam – oldest oil-producing state; key fields are Digboi, Naharkatiya and Moran-Hugrijan
These three regions — Mumbai High, Gujarat and Assam — are the major petroleum production areas in India.
Source: Conventional Sources of Energy, Chapter 5
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Explanation
- 5 marks → ~5 points: Examiners expect role/importance (2 points) + geological occurrence (1 point) + distribution with named fields (2–3 points).
- Always name all three major regions and specific oilfields (Digboi, Ankeleshwar, etc.) — these fetch direct marks.
- The phrase "nodal industry" is from the textbook — use it exactly; it shows precise knowledge.
- Avoid mixing up petroleum with natural gas details unless asked.