Geothermal Fluid Identification at Geothermal Area Sorik Marapi using 2d Resistivity Imaging

Abstract

This research is done to determine the geothermal fluid flows by using 2D resistivity imaging and to identify the stones that compile the mineral by using XRD at geothermal Area Sorik Marapi, North Sumatera Province. The area is located at 99 32'.050"E- 0 41'193' N to 99 32.861"E- 0 41'214'N. The results from XRD by using difractometer Jeol-350 Shimadzu 6100 Show that the intensity from x ray difraction has the geothermal fluid spreads laterally to the geothermal manifestation. Four lines were surveyed by using 2d resistivity imaging for geothermal delineation purpose. The 2d resistivity imaging survey site shows the existence of geothermal fluid flows. The maximum depth of investigations for the surveys is 31,3 meters and 155 m of length of each line. The array used in this study areWennerSchlumberger. In general the results show that all the subsurface is made up of limestone (resistivity value of less 100 ohm-m) and clay with resistivity also less than 100 ohm-m in all the sections. XRD survey shows the mean mineral that compile the get othermal stones at Sorik Marapi are Quartz (O2Si) and magnesium (Mg). This mineral is the mean mineral that compile the clay.