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.