Focused Inversion of Gravimetric and Magnetotelluric Data for Geothermal Investigations

Focused inversion techniques may be applied to geophysical data inversion in order to image complex structures in the subsoil. These algorithms may image complex “blocky” structures giving useful information in geothermal exploration that may be smoothed out by standard inversion algorithms that use stabilizer that penalize sharp transitions. We have tested the modified total variation and the maximum gradient support stabilizers in the inversion of synthetic and field magnetotelluric and gravimetric data. The gravimetric data from the Luhoi geothermal prospect have been used to map the sharp density transition between the sandstone and the overlying claystone layers. The resulting horst structure imaged in 2D and 3D models by the maximum gradient support stabilizer solution allow to trace the main fault system that drives the up-flow of hydrothermal waters. The 1D magnetotelluric “blocky” models with lateral constrain (pseudo-3D) image the lithological contact between the claystone and sandstone far from the horst area and reveal resistivity variations in the claystone layer associated with sand lenses. In the horst area, resistivity models image hydrothermal alteration affecting the sandstone layer.