Evaluation of Petrophysical Properties of the Sapele Shallow Field, Niger Delta Area, Southern Nigeria

Abstract

Petrophysical properties are used to characterize a reservoir. Hence, this study evaluates petrophysical properties of the Sapele shallow field in the Niger Delta Area of Southern Nigeria with the aid of log data such as gamma-ray, density, neutron, and resistivity. Quantitative properties including shale volume, porosity, permeability, Irreducible water saturation, formation factor, water saturation, and hydrocarbon saturation were carried out using the well logs. One oil-bearing reservoir was identified across the field. Computed petrophysical parameters across the reservoir provided average porosity ranging from 0.30 to 0.36, permeability values range from 2707.9 to 3721.9 milli Darcy (mD) and the average hydrocarbon saturations are 0.51, 0.42, 0.47, 0.46, 0.47, and 0.49 for well 21, 22, 29, 30, 31, and 32 respectively. The field covers an area extent of 17137.18 acres.

Keywords

• hydrocarbon saturation;
• irreducible water saturation;
• porosity;
• permeability