| Abstract |
The Early Carboniferous Limestones of the UK represent a regionally extensive yet underexplored geothermal resource. This study aims to assess their geothermal potential by integrating subsurface geophysical interpretation with fracture network analysis and discrete fracture modelling. Using legacy seismic reflection and borehole data, we construct a 3D geological framework to map the distribution, thickness, and burial depth of the limestone aquifer, thereby constraining thermal gradients and reservoir geometry. Outcrop-based structural studies provide high-resolution data on fracture intensity, orientation, aperture, and connectivity. These parameters are used to build Discrete Fracture Network (DFN) models to simulate fluid flow through the fractured carbonate system under geothermal production scenarios. By linking fracture characteristics with reservoir permeability and heat transport capacity, we quantify the impact of structural heterogeneity on resource viability. Preliminary findings highlight the significance of fracture-controlled permeability enhancement in low-porosity carbonate settings and suggest promising geothermal gradients in areas of enhanced fracturing. This integrated approach provides a robust framework for geothermal prospectivity analysis in sedimentary basins, offering new insights for medium to high enthalpy geothermal development in the UK and similar carbonate provinces. |