Pemodelan geokimia lapangan panasbumi Dieng mengunakan metode geokimia fluida dan isotop
D Daerah penelitian merupakan lapangan panasbumi Dieng yang berada pada empat kabupaten, yaitu Kabupaten Wonosobo, Kabupaten Banjarnegara, Kabupaten Batang, serta Kabupaten Kendal, Provinsi Jawa Tengah. Tujuan utama dari penelitian ini adalah untuk mengetahui jenis sistem panasbumi daerah penelitian serta zona upflow dan outflow berdasarkan metode-metode geokimia. Metode pertama adalah geokimia air yang meliputi ion balance, tipe air, sumber air, geothermometer air, dan geoindikator air. Metode kedua adalah geokimia gas yang meliputi sumber gas, geothermometer gas, dan geoindikator gas. Metode ketiga adalah geokimia isotop yaitu sumber fluida. Berdasarkan ketentuan deskriptifnya, daerah penelitian termasuk kedalam high relief liquid-dominated system. Berdasarkan sumber panasnya, daerah penelitian termasuk kedalam sistem vulkanik-hidrothermal. Berdasarkan temperatur reservoirnya, daerah penelitian termasuk kedalam sistem panasbumi temperatur tinggi dengan suhu reservoir berkisar antara 275ï‚°C sampai dengan 325ï‚°C. Berdasarkan interpretasi geologi dan geokimia, daerah upflow pada daerah penelitian berada pada area Kawah Sikidang yang terletak di tengah daerah penelitian, sedangkan daerah outflow terbagi menjadi dua: pertama mengarah ke barat daya daerah penelitian, tepatnya ke arah daerah Bakal dan yang kedua mengarah ke barat laut daerah penelitian, tepatnya ke arah daerah Kepakisan.
T The research area is a Dieng geothermal field that located at four regency, that is Wonosobo regency, Banjarnegara regency, batang regency, and Kendal regency, Central Java province. The main purpose of this research is to know the research area geothermal system and the upflow and outflow zone based on the geochemistry methods. The first method is water geochemistry including ion balance, water type, source of water, water geothermometry, and water geoindicator. The second one is gas geochemistry including source of gas, gas geothermometry, and gas geoindicators. The third one is isotope geochemistry which is the source of fluids. Based on the descriptive provisions, the research area is a high relief liquid-dominated system. Based on the heat source, the research area is a volcanic-hydrothermal system. Based on the reservoir temperature, the research area is a high temperature geothermal system with the reservoir temperature ranged from 275ï‚°C to 325ï‚°C. Based on the geology and geochemistry interpretation, the upflow zone at the research area is on Sikidang crater area that located at the center of the research area, meanwhile there are two outflow zone. The first one is lead up to north west research area, precisely towards the Bakal area and the second one is lead up to south west research area, precisely towards the Kepakisan area.