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

Moran is an oil field located in Assam, not Gujarat. It is part of the Upper Assam oil belt along with Digboi, Naharkatiya, and Moran-Hugrijan fields. Ankaleshwar, Kosamba, and Mehsana are all well-known oil fields located in Gujarat. Ankaleshwar is one of the largest onshore oil fields in India, discovered in 1960. Kosamba is located in the Surat district of Gujarat. Mehsana is another important onshore oil-producing region in northern Gujarat operated by ONGC. Therefore, Moran is the odd one out as it belongs to Assam's petroleum reserves.