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In this work, the ionic composition of formation water of three oil deposits (C2vr, C2b, C1pr) was studied. The study of these deposits holds both practical and scientific interest. Due to their complex geological structure, they are difficult to develop. Productive deposits are characterized by the presence of widespread unconsolidated zones with high vertical and horizontal fracturing, high layered heterogeneity, the absence of significant regional reservoir-seal rock, and difficulties in cross-well section corr...