The Benefits of Surface Thermal Features Monitoring in Darajat Geothermal Field

Abstract

Monitoring of the Darajat surface thermal features has been conducted since 2008 on an annual basis. Thermal manifestation monitoring includes geotechnical investigation and geochemical sampling of liquid and gas discharges from both hot/warm springs and fumaroles. Geotechnical examination is normally conducted to monitor changes in the intensity, size and geometry of the surface manifestations including the assessment of potential associated geological hazards such as landslides and thermal ground hazards. Visual inspection of the surface thermal features including accurately mapping of their locations, especially the fumaroles, is done to determine if these natural features are moving and to investigate their potential negative impact on nearby surface facilities. The geochemical monitoring is aimed at determining changes, if any, in the relationship between the surface thermal features and the Darajat steam reservoir. The geochemical and geotechnical analyses are then merged to provide an integrated interpretation of the thermal manifestations.