Option 1 -> Nawgam is an oil field located in Mehsana district of Gujarat.
Option 2 -> Kosamba is an oil field situated in Surat district of Gujarat.
Option 3 -> Lunej is an oil field found in Bharuch district of Gujarat.
Option 4 -> Moran is an oil field located in Assam, not in Gujarat.
Hence, Option 4: Moran -> Moran is an oil field in the Dibrugarh district of Assam in northeastern India, making it the only option that is NOT an oil field in Gujarat -> correct