International Research Journal of Geology and Mining

Abstract

The study area is a part of the Geitafell central volcano in southeast Iceland. This area has been studied extensively for the exploration of geothermal resources, in particular low-temperature, as well as for research purposes. During the geothermal exploration, geological maps should emphasize on young corresponding rocks that could be act as heat sources at depth. The distribution and nature of fractures, faults as well as the distribution and nature of hydrothermal alteration also have to known. This report describes the results of a gradient calculation method which applied to low-temperature geothermal field in SE Iceland. The aim of the study was to familiarize the author with geothermal gradient mapping, low-temperature geothermal manifestations, as well as studying the site selection for production/exploration well drilling. Another goal of this study was to make geothermal maps of a volcanic field and to analyse if some relationship could be established between the tectonic settings and the geothermal alteration of the study area. The geothermal model of the drilled area is consistent with the existence of a structurally controlled low-temperature geothermal reservoir at various depths ranging from 50 to 600 m. Televiewer data show that wells ASK-29, ASK-82, ASK-56, ASK-50 and ASK- 83 in the study area have open fractures and show a comparatively high geothermal gradient indicating that further drilling for exploration/production should be executed. A geothermal map is presented from which possible drilling targets for production and exploration are suggested.