Conference Contribution Details
Mandatory Fields
Sarah Blake, Tiernan Henry, John Paul Moore, John Murray, Joan Campanya, Mark R. Muller, Alan G. Jones, Volker Rath, John Walsh
24th EM Induction Workshop, , August 12-19, 2018
Characterising thermal water circulation in fractured bedrock using a multi-disciplinary approach: a case study of St. Gorman’s Well, Ireland
Helsingør, Denmark
Poster Presentation
Optional Fields
The potential to exploit the geothermal energy of deep, thermal groundwater has been explored in Ireland as part of the IRETHERM project, which was funded by Science Foundation Ireland (grant number 10/IN.1/I3022). A number of low-enthalpy thermal springs were investigated using a multidisciplinary approach, integrating geophysical surveys, time-lapse measurements of hydrogeological parameters, and detailed hydrochemical analysis, with the aims of (1) identifying the source aquifer(s) for the thermal groundwater, (2) characterising the circulatory systems, and (3) assessing the potential for the existence of deeper, higher temperature, circulation patterns for future geothermal exploitation. St. Gorman’s Well is located in the limestones of the Carboniferous Dublin Basin. It discharges naturally to an ephemeral pond, and is typically dry during the summer months. The temperature and discharge profile of St. Gorman’s Well is complex and varies throughout the year. The Carboniferous Dublin Basin contains c. 2,000 m of sediments including carbonate build-ups (‘reefs’) of late Tournaisian to early Viséan age. This ‘reef’ facies, the Waulsortian Limestone Formation (Fm.), is characterized by very fine-grained, pure carbonates, which can be prone to chemical dissolution and the development of karst features. St. Gorman’s Well discharges from the Waulsortian Limestone Fm. near to its faulted contact with the younger Lucan Fm., which is a deeper basinal facies characterised by thinly bedded limestones and shales. Secondary porosity (fractures and karst) in the Waulsortian Limestone Fm. is likely to contribute to the development of thermal springs in the Dublin Basin.
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