The Sibayak Geothermal field is a volcanic geothermal system with the presence of manifestations, located in North Sumatera, Indonesia and is within the Singkut Caldera. Sibayak field is classified into a hot, liquid-dominated geothermal system with temperatures ranging from 240ºC to 300ºC and an average pressure of 100 barg. The previous numerical model created was in 2001 with data of all 10 wells. However, well data used in this model were solely based on drilling data as field has not been produced. Hence, a newly updated numerical model was made based on the most recent conceptual model as well as reservoir data after the field has started producing in 2008. The natural state of the model was validated by updating well data, whilst calibration of the natural state between simulated and observed data were done by using the most recently obtained pressure-temperature data.

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