Pressure Transient Analysis (PTA) is a sophisticated method used to determine crucial reservoir parameters such as permeability, porosity, permeability-thickness, the radius of investigation, boundaries, and hydraulic connectivity between wells. The most widely applied pressure transient tests in geothermal wells are the pressure buildup, drawdown, fall off, and interference tests. This study characterizes Alaşehir geothermal reservoir using special interpretation techniques such as Bourdet pressure derivative analysis on a log-log scale and straight-line analysis (semi-log analysis and special lines). An academic version of the Kappa-Saphir module was used for the analyses. The pressure transient analyses suggested that geothermal wells produce from intersected fractures in the Alaşehir field. Double porosity behavior was found in most of the wells. High permeability-thickness products are in good agreement with the high production performance of the wells. A high skin factor was calculated in some wells, which might be related to the high content of solid particles used in the drilling fluid. No-flow boundary detected in the wells might suggest sealing faults, while constant pressure boundary might be due to injection supports in the nearby injection wells. Once the reservoir properties are obtained, the spatial distribution of the parameters is constructed for the reservoir characterization, giving good insight into the field development.

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