The gravity mo
deling of the Eburru was con
ducte
d in an attempt to
delineate geological structures controlling he geothermal system an
d estimate the geothermal reservoir extent. A total of 375
data points were use
d an
d a Bouguer
density of 2.27 g/cm3 to generate a complete Bouguer anomaly map of the area. Gravity
data were separate
d into regional an
d resi
dual components to enhance the structural features from the se
dimentary an
d basement rocks in the stu
dy area. The gravity
data were analyze
d using gra
dient interpretation techniques for e
dge
detection, such as horizontal
derivative an
d an improve
d normalize
d horizontal tilt angle. For carrying out the three-
dimensional (3-D) mo
deling, a volume of 12 × 13 km an
d 5 km
deep was selecte
d. The mo
del was constraine
d using the estimate
d densities of cuttings obtaine
d from the
drille
d wells. This stu
dy presents the interpretation results of various gravity anomaly maps an
d 3-D inversion mo
del. Interpretation of horizontal
derivative an
d improve
d normalize
d horizontal tilt angle of gravity
data in
dicate the existence of high gra
dient anomalies. The anomaly maps were use
d to i
dentify several faults that compare
d well with the mappe
d faults. The 3-D mo
del reveale
d a
dense bo
dy interprete
d as the geothermal reservoir with a volume of about 3.0 km3 an
d an average block
density value of 2.45 g/cm3 . The
dense bo
dy which is a fracture
d zone overlies a high
density bo
dy likely to be the heat source responsible for heating the reservoir. There appears to be a close relationship between the faults system an
d the geothermal reservoir. These faults serve as flui
d pathways from
deeper parts to shallow regions. The results obtaine
d from this stu
dy will lea
d to an improve
d un
derstan
ding of the geothermal system in the stu
dy area an
d ai
d the future geothermal exploration of the fiel
d.