ABSTRACT

 The petrophysical characteristic using Interactive Petrophysics software (IP) of four wells within the Niger Delta field has been studied to evaluate their hydrocarbon potential, geomechnamics and pore pressure. For each well, the following logs were collected; resistivity log, sonic log, density log, neutron log and gamma-ray log. These in situ well logs were subjected to well log analysis and interpretation. The following Petrophysical parameters; porosity, water saturation, reservoir thickness and volume of shale were estimated for each hydrocarbon-bearing zone delineated for each well. Petrophysical evaluation indicate that the wells entered formations with good reservoir quality in terms of porosity, which ranges from (21.9 - 29.7 %), shale volume (8.7% - 41.7 %), bulk volume of water (3.9 % - 16.8%), water saturation (14.4% - 77.7%) and net pay zone (4.724 - 19.812 m), the reservoirs interval is between 2305.812 - 3812.896 m. The hydrocarbon reservoirs in this study were found to be in the Agbada Formation, which is in conformity with the geology ofthe Niger Delta, Nigeria. Most of the reservoirs are Oil-Water-Contact (OWC) having average values of 0.287 - 0.312 for Poisson’s ratio and 1.770 - 1.902 for Vp/Vs ratio. Pore pressure properties were estimated in a viable reservoir in the study area. Eaton’s pore pressures resistivity is between 3548.585 - 5412.812 psi, while pore pressures sonic is between 3417.297 - 5412.812 psi, the overburden pressure range between 7046.029 - 12036.040 Ibs/gal, with overburden gradient between 17.849 - 18.557 Ibs/gal. Velocity and Poisson ratio in the reservoirs is between 1.699 - 1.962 and 0.235 - 0.324. The average fracture gradient for resistivity and sonic range between 15.745 - 17.147 Ibs/gal and 15.716 - 17.147 Ibs/gal respectively. Average fracture pressure for resistivity and sonic range between 6219.877 - 11121.350 psi and 6176.134 - 1121.350 psi. The values of pore pressure are seen to correspond to the fluid content delineated from geomechanical evaluation ofthe reservoirs in the study area.