Which one among the following is NOT a major oil field located in Gujarat?

India's onshore crude-oil production is concentrated in two petroliferous basins: the Cambay Basin along the Gujarat coast, home to fields such as Ankleshwar, Kosamba, Kalol, Mehsana, and Nawagam; and the Assam Shelf / Upper Assam Basin in the north-east, home to fields such as Digboi, Naharkatiya, Moran, and Rudrasagar.

Applying this to the four options: Ankaleshwar sits in Bharuch district, Kosamba in Surat district, and Mehsana in North Gujarat — all three fall within Gujarat's Cambay Basin. Moran, by contrast, lies in Sivasagar district of Assam, part of the Upper Assam oil belt, hundreds of kilometres from Gujarat.

• Ankaleshwar — Cambay Basin, Bharuch district, Gujarat; one of India's earliest producing oil fields.

• Kosamba — Cambay Basin, Surat district, Gujarat.

• Mehsana — Cambay Basin, North Gujarat; a major oil and natural gas field.

• Moran — Upper Assam Basin, Sivasagar district, Assam — not part of Gujarat's oil belt.

Since Ankaleshwar, Kosamba, and Mehsana are all genuine Gujarat oil fields while Moran belongs to Assam, Moran is the field that is NOT located in Gujarat.