The Arlan oil field is the largest in the Republic of Bashkortostan. One of the most important oilfield facilities is the Kashir and Podolsk deposits, which have been developed by single wells for a long time. Since 2002, the active involvement of Kashir and Podolsk deposits in production has begun by drilling new horizontal wells and adding the old fund of directional wells. During testing of intervals defined as oil-saturated, according to the results of the interpretation of geophysical studies of wells, mineralized reservoir water was often obtained as a fluid. Also, not all newly drilled horizontal wells reached the predicted flow rates and water cuts. In order to increase the efficiency of testing and commissioning of new wells in 2021, research work was carried out, the results of which significantly change the understanding of the geological structure and oil content of the Kashir and Podolsk deposits. The main result of the research is the change of the idea of the type of deposits of Kashir and Podolsk deposits from lenticular to formation-arch deposits with the presence of water-oil contacts. А model of saturation of sediment rocks is proposed, explaining the layering of water and oil-saturated reservoirs within the same formation. The technogenic factors complicating the study of the object are also considered. The implementation of the techniques obtained as part of the research made it possible to complete the missed oil-saturated intervals, clarify the volume and structure of reserves, which will increase the efficiency of developing of new wells.
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