UPSC Mains 2025 GS1 Q14 — Resource Geography
Give a geographical explanation of the distribution of off-shore oil reserves of the world. How are they different from the on-shore occurrences of oil reserves? (Answer in 250 words)
Question Decoded — examiner's intent
- Directive verbs
- Give a geographical explanationHow are they different
- Scope keywords
- distribution of off-shore oil reservesof the worldon-shore occurrencesoil reserves
- Implicit sub-parts
- Geological conditions favoring offshore formation (e.g., continental shelves, sedimentary basins, river deltas).
- Global hotspots of offshore reserves mapped by region (Gulf of Mexico, North Sea, Persian Gulf, South China Sea).
- Comparison of geological age and organic matter sources between onshore and offshore deposits.
- Technological and extraction challenges unique to the marine environment compared to land-based drilling.
- Common pitfalls
- Listing major oil-producing countries without focusing specifically on 'off-shore' locations (e.g., mentioning Saudi Arabia's land rigs instead of Safaniya).
- Failing to explain 'why' they are there (geographical explanation) and instead just providing a list of names.
- Neglecting to mention the role of plate tectonics and continental margins in the formation of offshore basins.
- Ignoring the 'differential' aspect—simply describing both types separately without a direct comparative framework.
- Dimensions required
- Geological/LithologicalSpatial/CartographicTechnological/OperationalEconomic/Logistical
- Marks allocation hint
Dedicate 100 words to the geographical explanation and spatial distribution, ensuring a world map sketch is included for 5-6 marks. Use the remaining 150 words for a structured comparison between offshore and onshore reserves, focusing on depth, pressure, extraction cost, and geological maturity for 9 marks.
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