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The use of indicator methods in oil and gas field geology allows us to obtain representative quantitative information about the direction and velocity of fluid movement in the studied formations, to assess the main filtration parameters and the presence of inter-reservoir flows, as well as reliable information about the technical condition of wells. The use of indicators (tracers) is based on the injection of water (or an aqueous solution of the reagent) labeled with a stable or radioactive indicator and subsequen...