Abstract
The manuscript deals with the hydrogeological condition of Archean rock massif investigated for underground building of radioactive wastes isolation. Exploration methods included well boring up to depth of 700 m, geophysical logging, hydrogeological pumping tests; water and rock sampling. Pumping tests carried out with systematically scaled intervals of 50 meters isolated by packers. Water samples were tested with chemical methods for main ions, ICP MS for trace elements and for radioactivity. Rock samples were tested in porosity, permeability, chemical composition, physical properties. Rock massif is represented by lower Archean gneisses pierced by dykes of dolerite. All rocks have very low reservoir properties due to an intense metamorphism. Laboratory tests have indicated that an average open porosity is equal to 0.33%. Almost 70% of obtained values of hydraulic conductivity belong to the range of 0.0001 m•day -1 – 0.001 m•day -1 , while average hydraulic conductivity is equal to 0.004 m•day -1 . There were found four vertical zones depending on the bases of drainage and differing in rock permeability and filtration conditions. The TDS of groundwater varies from 140 to 641 mg•L -1 , the type of water is HCO 3 –Na–Ca, water has alkaline and reductive media.
Highlights
Hydrogeological conditions were investigated along with geological exploration of the rock massif for underground isolation of radioactive wastes
Perspective site of rock massif is situated in the south western part of the Siberian Craton that was named as Yenisseyskiy Ridge (Figure 1)
Hydrogeological units: 1 –Jurassic; 2 – Palaeozoic; 3 – Proterozoic; 4 – Archean; 5 –Fissured aquifers in the intrusive rocks. 6 – Borders of hydrogeological units, reliable (а) possible (б); 7 – tectonic faults, reliable (а) possible (б); 8 – studied massif. This structure during the last quarter of century magnetized the attention of Russian nuclear experts to create the repository of solid radioactive wastes
Summary
Hydrogeological conditions were investigated along with geological exploration of the rock massif for underground isolation of radioactive wastes. 6 – Borders of hydrogeological units, reliable (а) possible (б); 7 – tectonic faults, reliable (а) possible (б); 8 – studied massif. Hydrogeological units: 1 –Jurassic; 2 – Palaeozoic; 3 – Proterozoic; 4 – Archean; 5 –Fissured aquifers in the intrusive rocks. This structure during the last quarter of century magnetized the attention of Russian nuclear experts to create the repository of solid radioactive wastes. At first the underground isolation in Proterozoic granites of the Nizhne-Kanskiy massif was considered to be more reasonable in science [1]
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