インドネシア・フローレス島のマタロコ地熱地帯における自然電位

抄録

A self-potential (SP) survey was carried out at the Mataloko geothermal field as a part of geothermal exploration for a future exploitation in Flores Island, Nusa Tenggara, Indonesia. As a result the highest positive SP anomaly was observed at the main geothermal manifestation area. The extent of positive SP anomaly zone has a good correspondence with a hot-spring area. In order to estimate the extent of the high permeability zone around the surface manifestation zone, a two dimensional numerical model was developed with a coupled fluid flow and SP simulator. A rough estimation of the permeability distribution of the Mataloko geothermal area was thus executed by matching of the calculated SP with the observed data.