Geological Model and Permeability Framework of Bukit Daun Geothermal Field, Indonesia

Abstract

We present results from a study that investigates the geological setting of Bukit Daun geothermal field, Indonesia and how that geology may influence hydrology. Our analysis addresses geologic controls from the regional to the wellbore scale, and incorporates data provided by Pertamina Geothermal Energy with publicly available terrain images and geologic data. Extensive use of the regional geologic setting (i.e., outside the prospect area) enabled us to improve the confidence and plausibility of the geologic interpretation.
We developed a 3D geologic and structural model and used it as a framework for a hydrologic interpretation that is based on well temperature profiles, feedzone locations, distribution of surface manifestations, and shape of the clay cap. Pertamina Geothermal Energy’s drilling success discovered a potentially viable resource and our study proposes a hydrologic model for that resource. Our analysis identifies those elements of the geology that may influence fluid flow at the reservoir and wellbore scale.