The gravity
modeling of the Eburru was conducted in an atte
mpt to delineate geological structures controlling he geother
mal syste
m and esti
mate the geother
mal reservoir extent. A total of 375 data points were used and a Bouguer density of 2.27 g/c
m3 to generate a co
mplete Bouguer ano
maly
map of the area. Gravity data were separated into regional and residual co
mponents to enhance the structural features fro
m the sedi
mentary and base
ment rocks in the study area. The gravity data were analyzed using gradient interpretation techniques for edge detection, such as horizontal derivative and an i
mproved nor
malized horizontal tilt angle. For carrying out the three-di
mensional (3-D)
modeling, a volu
me of 12 × 13 k
m and 5 k
m deep was selected. The
model was constrained using the esti
mated densities of cuttings obtained fro
m the drilled wells. This study presents the interpretation results of various gravity ano
maly
maps and 3-D inversion
model. Interpretation of horizontal derivative and i
mproved nor
malized horizontal tilt angle of gravity data indicate the existence of high gradient ano
malies. The ano
maly
maps were used to identify several faults that co
mpared well with the
mapped faults. The 3-D
model revealed a dense body interpreted as the geother
mal reservoir with a volu
me of about 3.0 k
m3 and an average block density value of 2.45 g/c
m3 . The dense body which is a fractured zone overlies a high density body likely to be the heat source responsible for heating the reservoir. There appears to be a close relationship between the faults syste
m and the geother
mal reservoir. These faults serve as fluid pathways fro
m deeper parts to shallow regions. The results obtained fro
m this study will lead to an i
mproved understanding of the geother
mal syste
m in the study area and aid the future geother
mal exploration of the field.