The problem of high reserve depletion and reserves deterioration has become a major challenge for many oil producers. TATNEFT PJSC pays considerable attention to the issues of reserve replacement, exploration and development of reservoirs containing hard-to-recover reserves. Such reservoirs include Domanic deposits composed of Devonian carbonates. They are confined stratigraphically to the Famennian and Fransian stages. The experience in studying the Domanic deposits shows low efficiency of conventional techniques. The paper discusses the issue of using a basic logging suite to identify productive reservoirs in the Domanic deposits. As there are no specific standards and classification system for the Fransian deposits, identification of potential pay intervals with mobile oil, determination of their thickness, porosity and oil saturation is performed from logging data using the TATNEFT’s standard procedure. None of the geological problems can be solved using only one logging technique. Thus, complexity and a great variety of geological problems dictate a principal integrated approach to using logging techniques and log data interpretation. To solve these problems, TATNEFT PJSC commenced a project for development of a logging suite to identify promising intervals with hard-to-recover reserves in drilled wells. To identify promising intervals in the Fransian-Famennian deposits, a logging suite is suggested to be used which involves a combination of nuclear-physical methods and seismoacoustic logging.
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