The Geothermal Potential of Northern Ireland

Abstract

The Geothermal Energy Review of Northern Ireland study completed in 2005 modelled data from previously drilled oil and gas, mineral exploration and deep geothermal exploratory boreholes to develop temperature maps at selected depths in Northern Ireland. This study predicted suitable lithologies and reservoir characteristics in potential geothermal aquifers in areas where temperatures above the normal geothermal gradient were recognised in the subsurface.
Acquisition of airborne aeromagnetic data by the TELLUS project in 2007, in conjunction with existing geological data, has improved the understanding of deep geological structures throughout Northern Ireland. The new data allows identification of targets for deep geothermal energy development as a result of the Sherwood Sandstone and Lower Permian Sandstone targets being better defined.
Reservoir modelling and preliminary resource assessment based on newly acquired petrophysical and reservoir parameters of both targets shows that the Lower Permian Sandstone target has the highest geothermal potential in the Larne, Lough Neagh and Rathlin sedimentary basins.
A profile of Northern Ireland’s energy usage shows that most electricity and heat requirements are met through the use of conventional fossil fuel technologies. Current government policy is focussed on the development of renewable energy solutions to reduce current CO2 emissions. Deep geothermal energy in Northern Ireland could significantly contribute to the reduction of these emissions by providing a renewable heat source to both domestic and industrial sectors. Geothermal energy utilisation from Permo-Triassic basins should be considered as a suitable renewable energy alternative in these locations to supply heat to current and proposed future developments in order to meet the targets for the year 2020 set by Renewable Energy Directive through the national Renewable Energy Action Plans.