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UPSC Prelims 1987 · Indian Geography · Minerals and Energy
The Narimanam oil field is located in
- (a) Mahanadi delta
- (b) Krishna delta
- (c) Cauvery delta
- (d) Godavari delta
Show the answer and explanation
Answer: (c) Cauvery delta
Narimanam oil field is in the Cauvery delta (Tamil Nadu).
The idea
A delta and its offshore continuation can cover a thick sedimentary basin. Buried organic matter, porous reservoir rock and a sealing layer are the key ingredients for hydrocarbon accumulation. A field must be tied to its basin rather than to any nearby east-flowing river.
Why the others are wrong
(d) The KG basin is further north.
Also know
The Krishna–Godavari basin is a separate hydrocarbon region farther north. Mumbai High is an Arabian Sea offshore anchor, while Ankleshwar is onshore in the Cambay basin. Delta sedimentation is a useful basin clue, but it does not guarantee oil beneath every delta.
🔒 Cauvery basin: Narimanam, Kovilkalappal.
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