Nowadays, on the territory of Western Siberia, the main profitable reserves have been found and involved in development. The enhancement of the resource base of Western Siberia is possible only through the involvement of oil and gas resources localized in the compound reservoirs, such as the deposits of the JS2/1 formation within the Surgut arch. The effective exploration of such resources is possible only at the sites that have been studied with sufficient detail and reliability. The objective of the work was to study geological texture of the JS2/1 formation within the Surgut arch for substantiating the most prospective zones of hydrocarbon localization and determining the main work aspects of geological exploration. This resulted in the creation of a two-dimensional reservoir rock model of the JS2/1 formation within the Surgut arch. Model building is based on data of 10,764 exploration and production wells. Reservoir rocks are distinguished by quality: high, medium and low. Distribution maps of reservoir rocks of high and medium quality, based on reservoir properties models and on offered ranking criterion, were constructed. For reservoir rocks of high quality, dependences of porosity ratio and oil saturation ratio on net pay were revealed. The predictive characteristics of the JS2/1 formation were confirmed in 736 wells. The use of distribution maps of reservoir rocks of high and medium quality of the JS2/1 formation within the Surgut arch will significantly increase the efficiency of geological exploration work.