Influence of transverse zones on the distribution of basement, tectonic configuration, and geothermal potential in the northern Perth basin, Australia

Abstract

The Perth Basin is characterized by the interplay of diverse tectonic events, predominantly extensional, and represents a significant area for hydrocarbon exploration and geothermal potential in Australia. This study aims to elucidate the structural configuration and distribution of the basement in the northern segment of the basin through the comprehensive integration of gravity, magnetic, and seismic data. The final model delineates a transverse zone located to the north of the study area, exhibiting sinistral shear that induces notable alterations in the trend of adjacent faults, further influencing the emplacement of bodies with enhanced magnetic susceptibility. Additionally, this tectonic configuration holds considerable implications for both hydrocarbon migration and the facilitation of geothermal fluid flow, as evidenced by the geothermal gradient maps pertinent to the study area. The findings underscore the pivotal role of transfer zones in shaping the configuration of intrusive bodies and in the geological evolution of the Perth Basin. It is posited that pre-existing anisotropy from the initial phases of extension has been reactivated, thereby modifying the trajectories of structures that govern sedimentation processes and the migration of various fluid types, including hydrocarbons and geothermal fluids.