Hydrogeology of the Razdolnoe Spa is ascribed based on data of
third wells (2-E, 2-B and 1-Al) drilled within limits of study area.
The basin is characterized by a complex hydrogeological structure
and by groundwater of diverse geochemical composition. Well No.
1-Al (30 m deep) is located on recharge zone and discloses Pliocene
volcanogenic aquifer (N2). Wells No. 2-E (314 m deep) and No. 2-B
(500 m deep) are disclosed the following aquifers (from top to the
bottom): (1) Quaternary alluvial sediments (aQIV); (2) Quaternary
deltaic sediments (amQIV); (3) Miocene sedimentary aquifer consisting
of the Ust-Suifun (N1us) and Ust-Davydovka (N1ud)
Formations; (4) Mesozoic sediments (MZ). A cross-section demonstrating
the hydrogeological conditions of the Razdolnoe Spa is
shown on Fig. 2. Hydrogeological characteristics of major aquifers
presented within the study area are showed below: