Abstract: The most common complication faced by petroleum engineers is the description of a reservoir, both accurately and efficiently. Inadequate and insufficient reservoir characterization lead most enhanced oil recovery and secondary recovery projects to fail and also makes it difficult to deal with heterogonous reservoir. An accurate description of a reservoir is vital to the reservoir management and achieving maximum oil recovery. Reservoir characterization plays a very important role in descripting the storage and flow capacity of a reservoir and also plays a decisive role in reservoir simulation. The main objective of this research is to identify reservoir barriers and productive zone using reservoir characterization, in this study some of the most useful methods such as Flow Zone Indicator (FZI), Discrete Rock Type (DRT), Winland R35 methods were applied to 4 different wells to identify the rock types and flow units developing a static reservoir characterization model. To achieve the objective of this research the static model is transformed into a dynamic model by introducing graphical method such as stratigraphic flow profile (SFP), stratigraphic modified Lorenz plot (SMLP) and modified Lorenz plot (MLP) to easily quantify reservoir flow units based on physical structure, storage capacity, flow capacity, rock type and reservoir process speed. The physical structure permits the flow units to be interpreted in a stratigraphic model arrangement, determining well-to-well correlation schemes; the main aim of understanding the flow unitís characterizations is to identify the barriers, speed zones and baffles.

Keywords: Flow Zone Indicator (FZI), Discrete Rock Type (DRT), Winland R35 methods, Flow unit (FU), Reservoir Quality Index (RQI), Hydraulic Flow Unit (HFU) stratigraphic flow profile (SFP), stratigraphic modified Lorenz plot (SMLP) and modified Lorenz plot (MLP).