Interpretation of Geoelectric Structure at Hululais Prospect Area, South Sumatra

Abstract

Schlumberger resistivity surveys were conducted in 1993 as part of a combined geological, geophysical and program to investigate a geothermal prospect in the Hululais area, Southern Sumatra. These resistivity data the upper conductive layer and were interpreted to define the shallow of a possible geothermal system. A follow-up magnetotelluric survey carried out to probe deeper than the dc resistivity survey results achieved. However, the resistive sub-stratum below the conductive layer was still poorly resolved. Possible reasons for this include preferential channelling of the telluric within the thick shallow very conductive layer, thus limiting the penetration depth of the magnetotelluric signals and poor resolution due to high noise levels caused by rain and sferics.