Petroelastic modeling of Vereiskian and Bashkirian deposits on example of an oil field in the Republic of Tatarstan

The purpose of this research was to present the results of petroelastic modeling of the Bashkirian and Vereiskian deposits of the oil field in the Republic of Tatarstan. To solve the problem of modeling elastic properties of the object under study (density, P-wave velocity and S-wave velocity), a self-consistent approximation model of effective moduli was used. The initial stage of petroelastic modeling included the selection of candidate wells and a reference well. To do this, the reliability of logging material in all wells was evaluated. The well with the most complete and accurate geological and geophysical information was selected. Then a petrophysical model was created by calculating filtration and reservoir properties and determining the formation volume factors of the rock components. Elastic property modeling began with the creation of a density curve on the basis of geophysical and petrophysical data. At this stage the petrophysical model was evaluated. The choice of the petroelastic model was based on theoretical and experimental methods. The efficiency of the chosen model was confirmed by the convergence of modeling results with the recorded well data. The modeling resulted in obtaining the curves of elastic parameter distribution over the studied geological section. A good correlation was received between the initial data of geophysical studies of wells and model curves. The obtained results made it possible to improve the quality of available geophysical material, as well as to recreate elastic properties in wells not using the methods of direct recording.