Geophysical Journal | 2005 volume 27 3

Hydrogeological conditions of the Mali-Nigerian syneclise in the western part of the Central Sahara

© Shchepak V.M.

In the previous century, sixties, with the purpose of oil and gas exploration, the Ukrainian and Russian specialists accomplished a wide package of geological-geophysical work in the eastern part of Mali Republic which includes the western half of the Mali-Niger syneclise of the western part of the Central Sahara. 2t resulted in drilling two structural parametrical holes: Tahabanat and In-Tamat. Which do not revealfny oil and gas in this region. At the same time scientific elaboration and generalization by the author of hydrogeological data on In-Tamat hole made clear that the artesian basin of self-effuse water with low salinity (1,5-2,6 g/dm3, usable for drinking under conditions of areas with restricted fresh drinking water resources), formally unknown in the Central Sahara, was discovered by this hole. The In-Esserin artesian basin of drinking water is linked with a section of sandstone and Cambrian-Ordovician conglomerates being a compact water-bearing stratum (up to 340 m), occurring at the depth of 800-1140 m. The In-Tamat hole well-spring flow from this water-bearing stratum averaged 527 m3/24 h, and the static pressure at the hole top - 156,8 kPa. The research done by the author also revealed that the native water of the In-Esserin artesian basin Cambrian-Ordovician water-bearing stratum is in the reduction physical-chemical state determining its high biological activity similar to the activity of the famous and unique fresh drinking water "Naftusya" from the Truskavets spa.

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