PRELIMINARY STUDY OF GROUND-PENETRATING RADAR FOR STEAM VENT AND FRACTURE IDENTIFICATION AROUND THE WELL PAD OF "TSC" GEOTHERMAL FIELD
Ground Penetrating Radar (GPR) surveys were conducted in well pad 4 of "TSC" Geothermal field where a well leakage was detected. A landslide few years ago caused the leakage and also formed a fumarole thermal manifestation as seen on the surface. Leakage and fumarole are dangerous as th...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/44001 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Ground Penetrating Radar (GPR) surveys were conducted in well pad 4 of "TSC"
Geothermal field where a well leakage was detected. A landslide few years ago
caused the leakage and also formed a fumarole thermal manifestation as seen on
the surface. Leakage and fumarole are dangerous as they are indicating that new
steam vent is forming, which can affect the ground stability. Anticipation and
mitigation were done through mapping of subsurface steam vent and fracture to
analyze their directionality. Profilings were done on 9 lines using MALA
Unshielded Antenna 50 MHz, CMP measurement was done in one point resulted in
2 layers with 0,14 m/ns and 0,16 m/ns in velocity. Profiling datas were processed
using REFLEXW by filtering such as gain, bandpass filter, fk-filter, and
deconvolution. Other than field data, pemodelan kedepan using FDTD technique
in MatGPR program was made to help in interpretation. Pemodelan kedepan
showed that dipping fracture with almost 90o angle formed more diffractions than
flat fractures. Field data processing showed areas with low-amplitudo reflection as
indicator of steam that migrates through fracture or vent. |
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