Magnetotellurics Data Application in Medium Enthalpy Geothermal Prospects
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Date
2020-06-26
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Geophysical Data Bases, Processing and Instrumentation
Abstract
The research is aimed at delineating the reservoir and defining the geothermal system of
Lili-Sepporaki through the interpretation of magnetotellurics data. Lili-Sepporaki is an andesitic-trachytic volcanic rich geothermal prospect located in western Sulawesi Province, Indonesia. In essence, hydrothermal conditions affect the properties of rocks, such as resistivity,
and this can be studied using magnetotellurics, a passive electromagnetic technique. Magnetotellurics data were processed and interpreted using Phoenix and WinGLink software programs. A total of five two-dimensional resistivity models and five elevation maps were
produced, and these showed a general decrease in rocks’ resistivity with depth. The analysis
found out that the reservoir stretches from the center, northwards. The reservoir substantially
starts to be seen at a depth of 600 m below sea level and deepens towards the east and northwest. Another magnetotelluric survey should be carried out with more stations, mainly aimed
at a three-dimensional inversion, to get a detailed geothermal model and also to study the
dense, low resistive structure in the southeast.
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Citation
MUTEBI, D., Andi Agus, N. U. R., HARYANTO, A. D., WIWID, J., & KAZINDA, M. (2020). Magnetotellurics Data Application in Medium Enthalpy Geothermal Prospects.