Reservoir Characterization using Seismic and Well Logs Data (A Case Study of Niger Delta)

Abstract

During analysis, hydrocarbon saturation in relatively unconsolidated sandstone reservoirs is a pore fluid property that has been successfully mapped using seismic surveys. The presence of hydrocarbon typically lowers the seismic velocity and density of unconsolidated to moderately consolidated sandstone and this in turn create different acoustic impedance (product of density and seismic velocity). This study reveals the petroleum potential and attempt to make available Petrophysical results for the various reservoirs in three (3) selected wells as these results will help enhance the proper characterization of the reservoir sands. The well log types used for quantitative analysis include resistivity, density and neutron logs. The gamma ray (GR) and calliper logs were mainly used for lithological identification, V_sh was evaluated using linear and Steiber methods and Archie’s equation was used in determining water saturation. The Petrophysical results reveal a good porosity (0.26 – 0.34), water saturation (0.09 – 0.32) and hydrocarbon saturation (0.77 – 0.83).

Keywords: Reservoir sand, Well log, Water saturation, Linear and Steiber