IDENTIFICATION OF PERMEABLE ZONE BASED ON GAS AND THERMAL INDICATION AROUND BANDUNG BASIN
Permeable zone detection on volcanic areas is very useful for volcanic activity observation and geothermal exploration. The common issues that usually found in permeable zone detection if we only rely on field data are the limitations in terms of time, cost, and the accessibility to the research are...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/41931 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Permeable zone detection on volcanic areas is very useful for volcanic activity observation and geothermal exploration. The common issues that usually found in permeable zone detection if we only rely on field data are the limitations in terms of time, cost, and the accessibility to the research area. The application of satellite data that being validated by fields data are expected to increase the effectiveness of permeable zone detection on geothermal field.
The study was carried out on the volcano area around the Bandung Basin. The data used in this study were ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) band TIR (Thermal Infrared Radiometer) and VNIR (Visible and Near Infrared Radiometer). Through TIR data that has been processed and corrected by vegetation factors and its emissivity using VNIR, we will get the map of Vegetation Corrected Land Surface Temperature (Tcveg). The Tcveg map then classified using quartile method into 4 classes. Classes with high Tcveg readings are the anomalies indicating the permeable zones and the low Tcveg are in vice versa.
Validation activities were carried out by measuring temperature and gases in the areas with anomalous readings like Domas and Papandayan Craters. The measuring also was done on non anomalous readings and non geothermal feature like Lembang Fault and Bandung. The result of field observations suggests that there were geothermal manifestations which were indicated by relatively high temperature, SO2, and CO2 gases. In general, the SO2 and CO2 reading is differrent at each area, but the pattern was relatively same. The SO2 and CO2 pattern that measured at the anomalous Tcveg area show a higher value than the non anomalous area. Geologically, one of the things that cause the formation of a permeable zone or pathway for gas in the research area to be able to rise to the surface is the existence of a structure.
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