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Petroleum Potentials and Well Log Evaluation from Niger Delta Basin
Abstract
It has being shown that the Niger Delta Basin has spectacularly maintained a thick sedimentary apron and certain petroleum geological features favourable for petroleum generation. This study reports the petroleum potential and well log evaluation of logs in three wells to characterize the reservoir sand bodies. 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 and hole-washout detection respectively. Sandstone reservoir was determined from GR logs, while the well porosities were estimated with two complimentary techniques: Statistical and deterministic. The statistical estimation of porosity was done using a multi-mineral evaluation module in the PP evaluation application. The flow zone indicator method was used for permeability modelling. Archie equation was used go determine water
saturation. The result revealed three wells contain four (4) different reservoir levels. The gamma ray and the resistivity logs show the porosities of the reservoir sand which averaged between 22-28%. Water saturation was generally low ranging between 0.14 -0.19, while permeability values ranged from 0.005-0.035 (K MD). The general field
report and well history in the study area shows that various pools have being produced overtime. The volume estimates of 2.54-43.90 MMBO for different reservoir intervals represent a deterministic STOIIP which could be produced with a water drive recovery mechanism since most reservoirs have effective aquifer system.
and calliper logs were mainly used for lithological identification and hole-washout detection respectively. Sandstone reservoir was determined from GR logs, while the well porosities were estimated with two complimentary techniques: Statistical and deterministic. The statistical estimation of porosity was done using a multi-mineral evaluation module in the PP evaluation application. The flow zone indicator method was used for permeability modelling. Archie equation was used go determine water
saturation. The result revealed three wells contain four (4) different reservoir levels. The gamma ray and the resistivity logs show the porosities of the reservoir sand which averaged between 22-28%. Water saturation was generally low ranging between 0.14 -0.19, while permeability values ranged from 0.005-0.035 (K MD). The general field
report and well history in the study area shows that various pools have being produced overtime. The volume estimates of 2.54-43.90 MMBO for different reservoir intervals represent a deterministic STOIIP which could be produced with a water drive recovery mechanism since most reservoirs have effective aquifer system.
