The magnetic method had been applied to identify the geothermal reservoirs in Kasinan-Songgoriti, East Java, Indonesia. The magnetic survey was performed using PPM G-856 and measured on 75 magnetic stations with spacing between each station is 200 meters. The magnetic stations cover of two main hot spring in Kasinan and Songgoriti. The magnetic data were processed by 2D and 3D data modeling. The result of the research showed the range of total magnetic intensity TMI from 31.0 nT to 1207.5 nT. The residual anomaly contour map revealed that geothermal reservoir was suspected tend to lie in an area with the low magnetic intensity value around the hot spring and identified as the volcanic breccia. Based on the integrated of 3D inversion and 2D forward modeling data analysis can be obtained the distribution of reservoirs location, depth and the thickness of the geothermal reservoir, the suspected of the presence of secondary structure, the fluid flow pattern from reservoir to the manifestation on the surface, and also Kasinan-Songgoriti geothermal system continuity retrieval.
magnetic method, reservoir, geothermal, Kasinan, Songgoriti
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