...Fig. 3. Typical outcrop of the Mamuniyat Formation in Jabal Eghei, where the formation is exclusively dominated by sandstone. ( a ) Humpback dunes overlain by antidunes, suggesting a waning flow signature during a jökulhlaup glacial flood ( Lang & Winsemann 2013 ). ( b ) Chute and pool...

... Paleozoic succession comprises the terrigenous Cambrian–Ordovician Gargaf Group consisting of at least five formations; from bottom to top, they are the following: Hasawnah, Ash Shabiyat, Hawaz, Melaz Shuqran, and Mamuniyat Formations ( Figure 2 ). The lowermost Hasawnah Formation rests unconformably...

... Shuqran Formations were deposited to fill the paleovalleys during Later-Ordovician glacial events. The top of the Mamuniyat was eroded and overlaid by Bir Tlacsin in some area and by thick shale of Tanezzuft Formation elsewhere, which formed the hydrocarbon seal and source rock at the base...

... the Melaz Shuqran and Mamuniyat formations, respectively, were published by El-ghali ( 2005 ). Logs from both of these wells are reproduced herein on Figure 5 . Both wells were drilled in the NC174 concession rather than NC115 ( Fig. 1 ). Figure 5 Sedimentary logs from the subsurface of the N...

...Figure 7: Ordovician-Silurian contact exposed in section Ghat-6 (a) and Ghat-7 (b) (see Figure 2 for location map). The vehicles stand on sandstones of the upper Ordovician Mamuniyat Formation, while the hills are formed by the basal part of the Silurian Tanezzuft shales. In section Ghat-7 (b...

...) Location and geological sketch-map of the Murzuq Basin, showing the location of the study area, the distribution of seismically defined palaeovalleys (ater Smart, 2000 ) and the area where oil fields occur in the Mamuniyat Formation. (c) LANDSAT image and (d) interpretative sketch of the Gargaf Arch...

... and Worsley (2000) . As in previous works (i.e., Boote et al., 1998 ), these authors consider the Lower Silurian hot shales of the Tanezzuft Formation ( Figure 2 ) as the source rocks, whereas the Upper Ordovician sandstones of the Mamuniyat Formation are regarded as the main reservoir, leading...

... hydrocarbon reservoir unit occurring in the Late Ordovician rocks known as the Mamuniyat Formation, which is the main sand-prone sedimentary package in the study area ( McDougall and Martin, 2000 ). The extension of the Late Ordovician ice sheet is defined on the basis of key evidence, such as striated...