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The article describes the results of geochemical studies of formation water in the Romashkinskoe oil field of the Republic of Tatarstan. Geochemical monitoring is a good indicator of the origin of natural waters, the method can be used to mark formation waters. The study of an extensive collection of produced water made it possible to trace the change in its geochemical composition depending on the age of formation of the reservoir in the Volga-Ural region. Geochemical studies were carried out in the produced form...

The paper investigates the problem of determining the interinfluence of production and injection wells on a single development target. To solve this problem, we develop a stochastic reservoir model, which is a variant of extended Kalman filter. The model is some simplification of the hydrodynamic model. Its purpose is to estimate interwell permeability through production history. We discuss different variants of the model, which vary basing on availability of certain input data. On the baseline, the model can only...