Abstract
The exact chemical composition of reservoir water from Lower Paleozoic shale formations is not known. Reservoir fluids produced during the tests performed in these formations contain a considerable amount of flowback fluid. Taking into consideration the results of the chemical composition monitoring of those fluids we observed a gradual growth of Cl, Na, Ca, Mg, and Br ion contents, approaching characteristic values of Cambrian reservoir water. In addition, the analysis of the hydrochemical indices of the examined liquids indicates the chemical similarity of Ordovician-Silurian waters to Cambrian waters.
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