We consider the results and some of the VSP technologies used for the investigations of the Lower<br>(Middle) Carboniferous fractured reservoirs that are applied at the last stages of the geological prospecting<br>operations in Tatarstan. The optimization of the geological prospecting operations is provided by the<br>investigations aimed at the estimation of the carbon-bearing reservoirs fracturing parameters, prediction and<br>control of the formation frac, preparing the areas for the drilling of horizontal wells.