The Taranaki Basin, the largest petroliferous basin in New Zealand, has a spatial closure of 150 km2 and a 3D seismic coverage of 1500 km2. The largest gas field in the STB is the Maui Gas Field. Seismic interpretation is the primary focus of this study, followed by structural-facies-petrophysical, potential well locations, and static volumetric estimates.Marginal marine (MM) is interpreted to be the most dominant facies association in the Mangahewa facies model, accounting for 64 of the depositional facies associated with this environment, according to two major reservoirs of the field, the Mangahewa and Farewell Formation. The combination of structural, facies and petrophysical factors creates a novel set of volumetric uncertainty scenarios for the gas field. © 2023, Petroleum and Coal. All Rights Reserved.