The Sirt Basin of Libya is ranked 13th among the largest world’s petroleum provinces and holds 43 billion barrels of oil equivalent (BBOE) of known petroleum volume. Multiple oil fields occur in the province, with reservoirs ranging in age from Precambrian to Miocene.

The Sarir Field lies on the western edge of the Calanscio Sand Sea in the southern Cyrenaica region of Libya and is considered the largest oil field in Libya.

The Nubian Formation or so-called Sarir Sandstone in the southeastern Sirt Basin is composed of five members, which can be correlated regionally using a lithostratigraphic framework. Within the Sarir Sandstone, there are two sandstone dominant members, each reflecting a rapid drop in base level, which represent the main oil reservoirs in the study area. Between these sandstones, there are thick shales, which define the architecture of the reservoir units.

This study is focused to evaluate the petrophysical characteristics of the Nubian sandstone in the Sarir Field. Several wireline logs were used in this study of four selected wells. The aim of this study is to perform full formation evaluation using petrophysical parameters from the wireline logs in order to determine lithology, shale volume, porosity, net pay zone, and fluid saturation. The resulted full formation evaluation led to better understanding of the importance of the analysis and distribution of petrophysical properties of the reservoir through the sandstone facies and predicted oil recovery.