In this paper we discuss the problem of the reservoir characterisation from the tracer test data. Oil-water rates and tracer concentration on the productional wells are available. The problem is to determine the permeability profile.

The new pseudorised equations for the displacement of oil by water with tracer in heterogeneous stratified reservoir are derived. Analyses of the tracer wave propagation into the layer cake reservoir during the waterflooding was given on the basis of analytical solution of the direct displacement problem. Exact analytical solution of the inverse reservoir characterisation problem provides explicit formulae for the profile of permeability.

The method developed was applied for the interpretation of pilot test on gas injection in the Vuktyl field (Russia, Timan-Pechora region). The results obtained from the tracer analyses data fits well with the data of logging and core analyses.

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