Identification of High Permeability Zone in Geothermal Field based on Magnetic Permeability and Dielectric Permittivity derived from SAR Polarimetric with in Situ Measurement
Keywords:
dielectric permittivity, magnetic permeability, dPSAR, geology, satellite imageAbstract
The high permeability zone has a vital role in a geothermal system and is a controlling factor for the occurrence of geothermal manifestations on the surface. This zone is often considered a weak zone associated with faults and fractures that allow geothermal fluid to pass from the reservoir to the surface. This study intends to identify high permeability zones using physical parameters in the form of relative dielectric permittivity (εr) and relative magnetic permeability (μr), which are derived from Synthetic Aperture Radar (SAR) imagery with full polarization. These parameters were extracted from SAR images using dielectric from Polarimetric Synthetic Aperture Radar (dPSAR) method. Verification is also carried out based on direct observations and measurements in the field using the Ferromaster Magnetic Permeability Meter and SM-30 Susceptibility Meter, which produce surface magnetic parameters to analyze the accuracy of dPSAR results. Based on the verification tests carried out in the manifestation zone of the Kamojang Crater, a high coefficient determination R2 around 0.82 was achieved. The dPSAR method results show that geothermal manifestation in Kamojang is characterized by high εr and low μr relatives to the surrounding area.
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