0440459 - GFÚ 2015 RIV NL eng J - Journal Article
MacFarlane, J. - Thiel, S. - Pek, Josef - Peacock, J. - Heinson, G.
Characterisation of induced fracture networks within an enhanced geothermal system using anisotropic electromagnetic modelling.
Journal of Volcanology and Geothermal Research. Roč. 288, November (2014), s. 1-7. ISSN 0377-0273. E-ISSN 1872-6097
Institutional support: RVO:67985530
Keywords : geothermal systems * magnetotellurics * fluid injection
Subject RIV: DE - Earth Magnetism, Geodesy, Geography
Impact factor: 2.543, year: 2014 ; AIS: 1.038, rok: 2014
DOI: https://doi.org/10.1016/j.jvolgeores.2014.10.002

As opinions regarding the future of energy production shift towards renewable sources, enhanced geothermal systems (EGS) are becoming an attractive prospect. The characterisation of fracture permeability at depth is central to the success of EGS. Recent magnetotelluric (MT) studies of the Paralana geothermal system(PGS), an EGS in South Australia, have measured changes in MT responses which were attributed to fracture networks generated during fluid injection experiments. However, extracting permeabilities from these measurements remains problematic as conventional isotropic MT modelling is unable to accommodate for the complexities present within an EGS. To circumvent this problem, we introduce an electrical anisotropy representation to allow better characterisation of volumes at depth. Forward modelling shows that MT measurements are sensitive to subtle variations in anisotropy.
Permanent Link: http://hdl.handle.net/11104/0243570