MODELLING OF THE EFFECTS OF FLUID SUBSTITUTION IN THE VISEAN DEPOSITS OF THE YABLUNIVSKE FIELD BASED ON THE INTERPRETATION OF WELL LOGGING DATA AND PETROPHYSICS

The paper discusses the details of application method fluid substitution which is used for predicting elastic properties reservoir rocks and their dependence on pore porosity. This makes it possible to predict changes in response a rock saturation with different fluids. main task this was study productive zones visean deposits Yablunivske field using example single well. integration petrophysics physics (Gassmann substitution) applied sandstones intergranular objective use petrophysical dependences, cross-plots Gassmann modelling determine effect fluids (brine, oil, gas) acoustic (compressional velocity, shear density). It established that sandstone predominant type considered rocks. determined as result implementation Gasman's technique. compressional velocity density decreased, slightly increased when brine substituted gas formed models. Limit values impedance Vp/Vs have been water saturated hydrocarbon strata V-20 – V-22 horizons. can be drilling new wells creating