In most platform-type reservoirs, most of the initial reserves are concentrated in terrigenous sediments, which are mainly found in the area and are characterized by high productivity, efficient development and high production rates. Despite the long development history of the Arlanskoye field, the Lower Carboniferous terrigenous formation is still the main production target. Seven pay zones with different reservoir characteristics have been identified in the main development target interval. The zones are unevenly distributed over the area. Three units have been identified - Upper, Middle and Lower. All three units are operated simultaneously and as a result there is an uneven development of reserves in terms of area and section due to the differentiation of reservoir properties combined with increased oil viscosity. At present, the target is in the final stage of development, the development system has been formed, the current well spacing density is 12 ha/well, and the recovery of reserves in the area is 98%. Scientific research and industrial experiments have enabled the formation of efficient development systems, which is evidenced by the high values of the current oil recovery factors (0.41-0.55) in the cross section of the identified lots. In the first place, it is necessary to determine the zones of location of the remaining recoverable reserves by section and to make decisions on their effective development. The application of an integrated approach allowed the commissioning of new horizontal wells and lateral horizontal wells with oil production rates of up to 170 t/day. The identification of residual reserve zones by section and area in mature fields under conditions of uneven reserve depletion is a promising direction. The results of the drilling confirm the relevance and feasibility of expanding the work on the verification of residual reserves by section in order to increase the efficiency of the development of the basic multi-zone target of the unique Arlanskoye field in the Republic of Bashkortostan.
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