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Sabak is one of hydrocarbon fields which located in CPP Block, Central Sumatra Basin, Indonesia. Each reservoir of Sabak has different production value. One of the potential reservoir is named 2060’sd. The production performance of 2060’sd from Bekasap Formation in this field is still not optimum yet. Geological understanding of reservoir body is needed for future potential development to enhance hydrocarbon production. Therefore, it is needed to generate a redefinition of reservoir to understand the geological condition of reservoir such as geometry, reservoir quality and distribution for proper plans/methods in the future development. The objective of this study is to interpret depositional environment using core and wells data. Formation pressure and tracer data is also used to know the connectivity of the reservoir. Mapping quality distribution of reservoir will be done based on volume of shale, permeability and porosity. To achieve an accurate interpretation, conventional core data from SBK#04 and SBK#16 is used in this study. Well log data such as gamma ray log, resistivity log and density-porosity log are obtained from all 27 wells in Sabak. Well log data such as gamma ray log, resistivity log and density-porosity log are obtained from all 27 wells in Sabak. From cores and electrofacies analysis, 2060’sd reservoir could be interpreted as tidal channel, sand bar and mud flat facies and associated with tide dominated estuarine environment. Reservoir quality distribution such as volume of shale, porosity and permeability show that tidal channel facies is better than those of sand bar and mud flat facies, it can be proved by production data of reservoir, confirmed with individual swab test data. In addition, formation pressure and tracer data proved that there is no connectivity between tidal channel and sand bar and mud flat facies.