The possibility of geothermal permeability detection by using seismic refraction method

Abstract

Abstract Jatirunggo geothermal field is a hot spring manifestation with temperatures ranges 35°C-38°C. Previous research by the resistivity method concluded that the Jatirunggo field as an outflow zone of a geothermal system. This study aim is demonstrating the possibility of the permeable geothermal zone detection by using seismic refraction method’s a complement of the geothermal conceptual model — the main research method by conducting refraction seismic. The method mainly applying active seismic wave to the media and identify the velocity properties of the pathway as a recording logger used 2D geode module which is consisting of 8 channels geophone by 5 meters geophone interval. The penetrating depth can reach 15 m - 20 m. Processing of velocity model has been used Hagiwara algorithm of 2 layers. The result shows velocity seismic recorded has a range of 138 m/s of topsoil layer up to 1742 m/s on the second layer. Based on the velocity model we can interpret the existence of a fault structure corresponding to the emergence of the hot springs, but the method was impenetrable up to the structured target.