Numerical Modeling of the NW Sabalan Geothermal Field, Iran

Abstract

The Sabalan geothermal field is situated in the NW of Iran within the vicinity of Ardebil Province. It is the first geothermal field in both Iran and the Middle East to be developing for electricity generation. Three deep exploration wells have been drilled at the NW Sabalan geothermal field during 2003/2004 following detailed geo-scientific surface surveys carried out in the mid to late nineties. The numerical model of the NW Sabalan geothermal field is presented implementing the geothermal simulator TOUGH2. The study has involved the development of a natural state model of the resource, based on assumptions regarding resource area and location of the upflow zone. The model has been successfully validated by matching available downhole temperature and pressure data from existing wells which appear to be located in an outflow which is peripheral to a hot upflow. The model results are consistent with the conclusions of deep exploration drillings that the NW Sabalan geothermal resource may extend to the southeast of the presently drilled area and could have a potential resource area in the order of 19 km2 and maximum temperatures of 260 to 270?C.