3D Geological Modelling for Geothermal Exploration in the Torrens Hinge Zone

Abstract

This paper describes 2D/3D Geophysical/Geological Modelling undertaken by the author for Torrens Energy in 2009, for the purpose of establishing 3D Geological Models of the upper crust within their Torrens Hinge Zone tenements in South Australia. Geological Models are a requirement for any Geothermal Energy explorer searching for Hot Dry Rock or Hot Sedimentary Aquifer targets. These Geological Models are assigned thermal parameters determined by field and laboratory measurements based on the lithologies included in the model. Heat resources may then be computed for the given volume based on the geological model and thermal rock properties. Whilst the studies were carried out for the purpose of creating temperature models and geothermal resource estimates, this document will discuss the geological models, geophysical investigations and tectonic implications generated by the study. Examples of Geological Models are shown from the Torrens Energy Port Augusta, Yadlamalka and Parachilna Geothermal Prospects, based over their GELs 230, 234, 235, 285 and 501.