Integrated Prospectivity Evaluation of XYZ Field Coastal-Swamp Depobelt Niger-Delta Basin Nigeria

Abstract

Five studies were conducted on the “XYZ” field to understand its reservoir properties, structural settings, and hydrocarbon-in-place. Petrophysical parameters were calculated using appropriate equations and wireline logs. 3D seismic fault models were created. A stacking pattern of the reservoir sand bodies was interpreted from a gamma-ray motif. The reservoir surface area was deduced using hydrocarbon indicators and seismic amplitude change. A seismic inline section corresponding with the reservoir zone was used for the seismic facie studies. Reservoir R1 has net-thickness of 111.71m and 117.09m, N/G ratio of 76% and 85%, effective porosity of 25% and 28%, hydrocarbon saturation of 44% and 40%, permeability of 14md and 16md, and Formation factor of 156.32 and 13.77 in well “XYZ-03” and “XYZ-05” respectively.Three-ways and two-ways fault-dependent closures with an anticlinal stratigraphic closure were delineated towards the western and middle parts of the field. Reservoir R1 generally shows an aggrading stacking pattern. R1 associated with wells "XYZ-03" and “XYZ-05” has hydrocarbon volume of 272,293.40m3 (1,712,674 bbl) and 193, 502.93m3 (1,217,097 bbl) respectively. Seismic facies showed continuous reservoir sand bodies. The field is endowed with moderate to good multiple reservoirs, and effective fault and stratigraphic closures, which support economically considerable hydrocarbon volume.