Home / Vol. 24 (2019)

DEPOSITIONAL ENVIRONMENTS OF THE UPPER ORDOVICIAN, MAMUNIYAT FORMATION, NW MURZUQ BASIN, SW LIBYA

Nuri Mohamed Fello

Libya

DOI: 10.68482/prj.2019.24.002 · Published Dec 2019 · Section: Environment · Pages: 9–16

Abstract

The Murzuq Basin, SW Libya, is one of a series of Palaeozoic intracratonic sag basins on theNorth African Saharan Platform. The structural fabric of the basin was developed during the Late ProterozoicPan-African Orogenic event, which has strongly influenced the stratigraphy and depositional patterns withinthe predominantly Palaeozoic clastic basin-fill.The Upper Ordovician (Ashgillian) Mamuniyat Formation is the primary reservoir target in three oilfieldsA, B and H within Repsol Oil Operations Concession area NC115, on the NW flank of the Murzuq Basin. Amajor problem with the Mamuniyat is the location of the sediment provenance, due to the lack of adequatesubsurface and outcrop data, and the relationship and controls on sediment flux, and the depositional systems.Petrographic data derived from sandstone samples from cored intervals through the Mamuniyat Formationshow that they are mainly sublitharenites, with some quartz arenites and litharenites. Compositional data forthe three oilfields indicate that they were derived from a similar parent rock. These same tectonic eventsinfluenced facies patterns, sediment deposition and interaction between a variety of shallow water marineand fluvial depositional environments across a NW-SE oriented storm-influenced coastline. Petrography andregional facies patterns suggest that the Mamuniyat sandstones were derived from a nearby, tectonically active,granitic basement source terrain, which was most probably the uplifted Ghat/Tikiumit Arch to the SW of NC115. Periodic uplift of the basin margin in the SW, and associated base level changes led to the basinwardprogradation of braided fluvial systems. That was followed by marine transgressive events emanating fromPalaeotethys in the northeast. Both the braided fluvial and shallow water marine sandstones of the MamuniyatFormation are primary hydrocarbon reservoir targets, with the main source and seal being the eustaticallycontrolled Lower Silurian Tanezzuft Shale.

Keywords

Ordovician Succession, Mamuniyat Formation, SW Libya

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