Oil pollution on the water surface is one of the most dangerous and difficult-to-eliminate emergencies. This article
shows the results of numerical modeling of oil transport on the surface of the Caspian Sea, taking into account the wind
and the Volga River. The numerical method is based on the Navier Stokes equations, which describes the flow of an
incompressible viscous fluid. The numerical method was verified using a test problem and the calculation results were
compared with the calculated data of other authors. The aim of the study is to assess the possibility and efficiency of
using the numerical simulation method to study the features of the formation of the composition of seawater after its
mixing with oil and its subsequent distribution. The behavior of an oil slick at different speeds of river flow and oil spill
is shown; it was also tested with and without wind in these cases. The calculated values obtained can make it possible to
predict in the future the most accurate data on the spread of oil pollution in order to prevent an environmental threat.