Abstract
The reservoirs in MGT field, deep offshore Niger Delta Basin Nigeria were studied with the aim of undertaking risk analysis of the identified prospects within the field through geological and volumetric assessments. Petrophysical analysis was carried out using two offset wells comprising gamma ray, resistivity, neutron, density and sonic logs. Seven reservoir sands (A-G) with structural traps, were carefully analyzed through well log and seismic interpretation. Amplitude extraction generated on the reservoir sands showed that only reservoirs: C and E are of goods and quality of possible hydrocarbon prospects. The hydrocarbon volume in place was estimated to be 46.4 and 386 million barrels for Reservoirs B and E respectively. The AVO generated for liquid factor indicated AVO Type III which points out a setting where unconsolidated reservoir sands are encased in higher impedance shales. The results of the study showed that MGT Field has a good hydrocarbon potential however, the geological and volumetric risk analysis of the reservoirs revealed moderately low chance of success of the identified prospect.