The Telemzane Block lies over 5388 km² within the western Telemzane Arch. This arch is an important east–west trending high separating the Ghadames Basin to the south and the Chotts Basin to the north. The arch was affected by mild and periodic uplift first during the Middle–Late Ordovician and then during the Hercynian orogeny. It was heavily truncated due to strong erosion, exposing Cambro-Ordovician clastic rocks. These rocks are unconformably overlain by a Mesozoic pile of carbonates, evaporites and silicoclastics. This setting appears to be quite similar to that of the Hassi Messaoud and Hassi Rmel ridges in Algeria.

Approximately 2300 km of seismic have been recorded and 2 wells were drilled in the block. The main reservoirs are the Mid-Upper Triassic TAGI sandstones, Ordovician sandstones and quartzites and Cambrian sandstones. The main trap types in the area are wrench related structures with fault bounded three-way-dip closure, low amplitude anticlines, pinch out and channel fill are. Lateral sourcing is assumed to have occurred from the adjacent Chotts and Ghadames Basins where the Upper Silurian - Lower Devonian Fegaguira shales and the Silurian Tannezuft hot shales are the main source rocks, respectively.

(Courtesy ETAP)