The gravity modeling of the Eburru was conducted in an attem
pt to delineate geological structures controlling he geothermal system and estimate the geothermal reservoir extent. A total of 375 data
points were used and a Bouguer density of 2.27 g/cm3 to generate a com
plete Bouguer anomaly ma
p of the area. Gravity data were se
parated into regional and residual com
ponents to enhance the structural features from the sedimentary and basement rocks in the study area. The gravity data were analyzed using gradient inter
pretation techniques for edge detection, such as horizontal derivative and an im
proved normalized horizontal tilt angle. For carrying out the three-dimensional (3-D) modeling, a volume of 12 × 13 km and 5 km dee
p was selected. The model was constrained using the estimated densities of cuttings obtained from the drilled wells. This study
presents the inter
pretation results of various gravity anomaly ma
ps and 3-D inversion model. Inter
pretation of horizontal derivative and im
proved normalized horizontal tilt angle of gravity data indicate the existence of high gradient anomalies. The anomaly ma
ps were used to identify several faults that com
pared well with the ma
pped faults. The 3-D model revealed a dense body inter
preted as the geothermal reservoir with a volume of about 3.0 km3 and an average block density value of 2.45 g/cm3 . The dense body which is a fractured zone overlies a high density body likely to be the heat source res
ponsible for heating the reservoir. There a
ppears to be a close relationshi
p between the faults system and the geothermal reservoir. These faults serve as fluid
pathways from dee
per
parts to shallow regions. The results obtained from this study will lead to an im
proved understanding of the geothermal system in the study area and aid the future geothermal ex
ploration of the field.