Abstract
The reservoirs from three wells of greater ughelli depobelts were evaluated in this study in order to assess the qualities of the reservoirs: The geometric properties, water saturation, and volume of shale were computed and these revealed that the reservoirs are of good qualities. In addition, the depositional environments were characterized using gamma ray log. Generally, the petrophysical characteristics of the reservoirs are good especially at the areas of interest (hydrocarbon zones). The average total porosity and effective porosity ranges from 0.13%-0.34% and 0.12%-0.31% respectively which is within the range for commercial accommodation of hydrocarbon. The volume of shale values for some of the reservoirs are within the limits that could not affect the water saturation (0.05v/v decimal- 0.21v/v decimal). The water saturation in some zones is appreciably low (0.14%- 0.47%) This makes for high hydrocarbon accumulation in those zones. The neutron -log and density- log responses in well 04 and 06 presume that the hydrocarbon in most zones is gas due to the 'crossover' of the logs. The gamma ray log shapes of the reservoirs are predominately cylinder (serrated) shape in the three wells which indicates that the depositional environment was deltaic.
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