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By D.S. Macgregor, T.J. Moody, D. Clark-Lowes

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Later mid-Tertiary uplift and erosional unroofing of the surrounding highs exposed the Palaeozoic in outcrop around the basin margins. Although very lightly explored, with only four deep exploration tests, the basin is considered unprospective. The Tanezzuft Shale equivalent sequence appears significantly more silty than elsewhere, and is difficult to distinguish from the Acacus Sandstone Formation. A full geochemical analysis of its source capacity is not available but published lithological descriptions suggest it is probably fairly lean (Bellini et al.

It is possible Ordovician reservoirs were charged by downloading from a basal Tanezzuft Shale source, and a postulated middle Devonian carbonate trend was certainly well positioned to receive hydrocarbon charge from organic rich shales immediately above. However both possibilities are weakly constrained and must remain speculative. Reggane Basin. The Reggane Basin (Figs 2 and 19) is a large intra-cratonic Palaeozoic depression bounded by the Eglab (Hoggar) Shield in the south and Ougarta Arch to the north (Aliev et al.

The petroleum system is of moderate to high productivity with 1080 MMBOE reserves. Tanezzuft-Triassie (NW Oued Mya) petroleum system. A number of relatively small oil and gas accumulations occur clustered together in low-relief closures on the northwestern flank of the Oued Mya Basin. The hydrocarbons are reservoired in Triassic sands resting unconformably upon the Cambro-Ordovician and were clearly charged by long distance lateral migration from subcropping Tanezzuft Shale, 20-40 km to the southeast.

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