Geothermal Potential of Positive Temperature Anomalies above Salt Structures in Nova Scotia

Abstract

Summary Low carbon renewable energy is required to support the energy transition away from hydrocarbons while meeting rising global energy demands. Geothermal energy is a proven system, capable of electricity production and direct heat, with over 95% availability. Normally geothermal energy requires a high geothermal gradient, however technological advances are improving the opportunities for deployment in lower gradient regions. In sedimentary basins the geothermal gradient is normally lower, however the presence of large salt deposits can provide localized regions with an increased gradient due to the unique characteristics of salt. Salt is able to mobilize and flow under suitable conditions, and form structures; it also has a thermal conductivity two to four times higher than clastics and carbonates. Therefore, sediments above salt structures are expected to have a higher geothermal gradient - positive temperature anomalies. This research focusses on assessing the geothermal potential associated with positive temperature anomalies above salt structures in selected areas of the Scotian and Maritime basins.