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Abstract
A reservoir is a subsurface rock that has effective porosity and permeability which
usually contains commercially exploitable quantity of hydrocarbon. Reservoir characterization is
undertaken to determine its capability to both store and transmit fluid. Petrophysical well log and
core data, in this paper, were integrated in an analysis of the reservoir characteristics by selecting
of three productive wells. The selected wells are located at Abu Attifel field in Libya for Upper
Nubian Sandstone formation at depth varied form 12921 to14330 ft. The main aim of this study
is to compare the laboratory measurement of core data with that obtained from well log data in
order to determine reservoir properties such as shale volume, porosity (Φ), permeability (K),
fluid saturation, net pay thickness. The plots of porosity logs and core porosity versus depth for
the three wells revealed significant similarity in the porosity values. The average volume of shale
for the reservoir was determined to be 22.5%, and average permeability values of the three wells
are above 150 md, while porosity values ranged from 9 to 11%. Low water saturation 13 to 22%
in the three wells indicates the wettability of the reservoir is water-wet.