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Geothermal Control System with Estimated Distribution of Resistivity Value Using AMT Method in Ungaran AreaNormal access

Authors: A. Gilang, A.T. Yuliwardana and A.I. Assidhiqie
Event name: EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering
Session: Poster session
Publication date: 09 April 2018
DOI: 10.3997/2214-4609.201800348
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 566.85Kb )
Price: € 20

Geothermal prospect area of Mount Ungaran is located approximately 30 km southwest of the capital of Central Java, Semarang. The area is physiographically located in the North Serayu Mountains formed by the lifting of the Miocene. This mountain was active between the late Pliocene and the Late Pleistocene. In the area, there is a geothermal prospect located on the southern slope of Mount Ungaran, namely in Gedongsongo area. Several geothermal manifestations around Mount Ungaran include: fumarole in Gedongsongo area, hot springs in Banaran, Diwak, Kaliulo and Nglimut areas, and altered rocks are found in Gedongsongo and Kendalisodo. From existing research, a geothermal prospect in this area is dominated by water, which is structurally controlled by Ungaran caldera structure. From interpretation AMT, the heat source is thought to be a diorite intrusion with range value resistivity are 2.8-4.0 ohm.m. Cracked volcanic rocks of Lower and Tertiary Quarterly are thought to function as reservoir rocks with range value resistivity are 1.5-1.4 ohm.m. The impermeable upper quartile volcanic rocks are thought to function as cap rocks with range value resistivity are 2.8-4.0 ohm.m. Based on geothermometry on fumarole found in Gedongsongo area, reservoir temperature is estimated to reach 230°C.

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