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The monitoring of geothermal fields involves the measurement of steam fraction and enthalpy, which are used to calculate the chemical content of the reservoir. However, flow rate measurement is often problematic, particularly in the absence of buffer wells, making enthalpy determination difficult. To address this challenge, the authors developed data models to predict enthalpy using machine learning based on fluid chemistry data obtained from each well that is periodically sampled. They used more than 600 data with 36 parameters and applied algorithms such as Gradient Boosting Regressor, Random Forest Regressor, Ada Boost, and Deep Neural Network. The evaluation of the machine learning model outcomes showed that Gradient Boosting Regressor produced the most accurate results.