Intisar (103-L) Oil Field is located in the eastern part of Sirte Basin, Libya. The structure of this field is coral reef. The field is producing from the Upper Sabil Reservoir (Upper Paleocene in age). This formation consists of limestone. Sedimentary sequences varying from continental to near shore and marine sediments was forming the stratigraphic sequences of the basin. Sirte Shale (Upper Cretaceous, Campanian/ Turonian) is the dominant source rock in Sirte Basin petroleum province. The thickness of Sirte Shale ranges from a few hundred meters to as much as 3600 ft in the troughs. Sandstones are the most common reservoir rocks in sedimentary basins. Lime-stones and dolomite stones, some of which are the skeletal remains of ancient coral reefs, are other examples of reservoir rocks. In the study area, shales and marl in Kheir Marl Formation are considered as the cap rock. A complete package of porosity and resistivity logs, including neutron, density, sonic and induction logs have been recorded over the Upper Sabil Reservoir in Intisar (L) Field. The logs of the Upper Sabil Reservoir of four wells were read every 2' and analyzed for detailed evaluation of porosity, water saturation, net pay, and hydrocarbon pore volume. Net pay thickness map have been established. The average hydrocarbon pore volume, oil water contact (O.W.C), initial oil reserves and the original oil in place were estimated.
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