Reinjection Experience in Gonen Field of Turkey

Abstract

Gonen geothermal system can be defined as low
temperature fracture zone system that was formed on
NE-SW oriented Yenice-Gonen fault, which was
created by the North Anatolian Fault. The geothermal
system seems to be locally delimited by smaller faults
that were identified by geophysical surveys. Partial
reinjection conducted in the field did not stop
pressure decline and caused cooling in the
geothermal reservoir. After quadrupling the capacity
of the district heating system in 16 years of
exploitation, a pressure drop of about 6 bars and a
cooling of 10-15 o C were observed in the reservoir. In
this study, by analyzing the geological, geophysical
surveys and the available tests conducted, problems
arisen from the existing reservoir management are
stated, and solutions are proposed for improving
utilization of the geothermal system on the way to
sustainability.