A Study on the Production and Reservoir Performance of Balcova-Narlidere Geothermal Field

Abstract

In this work, we present a study evaluating and predicting the production and reservoir performance of the Balcova-Narlidere geothermal field, Turkey. The results of temperature profiles, well tests, pumping tests, well logging surveys and core and chemical analysis to determine the rock and fluid properties and as well as to characterize the Balcova-Narl?dere geothermal reservoir are evaluated and presented. One shallow and another deep, two concealed outflowing, horizons were identified with temperatures of 110oC and 140oC, respectively. Our natural state modeling study suggested a net recharge mass rate of about 51 kg/s and net heat recharge of about 33 MWt. The natural state model provided satisfactory matches of temperature vs. depth data measured at all wells. Based on static temperature measurements obtained from the wells throughout the field, a 3-D temperature distribution map was constructed. Initially about 50% of the produced fluid was reinjected into the shallow part of the reservoir. However our study indicated an inefficient reinjection with a premature reduction in the temperature of the fluids produced from the nearby shallow wells. Therefore the field management switched to a new reinjection scheme utilizing a new deep well drilled particularly for reinjection purposes. The reservoir limits were studied, and the volume of water in place and stored heat were estimated by various methods. The results of reservoir modeling studies conducted using a stochastic stored heat model and a lumped parameter model are given.