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The complex approach for analysis is especially actual for unconventional reservoirs of Pannonian basin related to fractured metamorphised rocks. Oilfield T respresents complex fractured reservoirs presented by metamorphised schists of Paleozoic age. They composed of tectonic breccias, eroded rocks, sericite and crystalline schists. At the beginning the field was producing by natural drive mechanism. At this period around 3% of geological reserves were extracted and it was resulted in formation pressure decreasing by 50-60%. After 5 years of such production there was a try to organize the system of peripheral waterflooding, but due to the geological complexity it failed. It was observed that wells productivity is very heretogeneous and the success of the conducted workovers is much variable. The complex analysis of this field is of a great interest because it could be used as a reference object for further exploration and production in the region. Also, it could be a site for new techniques and approaches verifications, especially working with complex fractured reservoirs. Therefore, the main goals of this work are deeper understanding of geology, estimation of heterogeneity with localization of the most productive intervals for further infill drilling and completion, and evaluation of oil recovery factor. To achieve these goals all available information was analysed: geological and geophysical data, production history, and numerous special methods, which are explained further.