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SUMMARY Abstract:This study was focused on calculating the geothermal gradient and checking it by thermal modeling in Asmari & Bangestan Reservoir in the Dezful Embayment, Iran. Temperature data are obtained in boreholes and then use for calculating the geothermal gradient. But sometimes determining of correct geothermal gradient due to some factors such as lithology variation and a little error in temperature readings is impossible. Also some wells show a geothermal gradient higher than others. For solving of these problems we utilized thermal modeling and organic geochemistry.