APPLICATION OF CSAMT METHOD FOR ESTIMATION GEOTHERMAL RESERVOARS IN TANGKUBAN PARAHU MOUNTAIN AREA AND SURROUNDING

• Main Author: Muthi Fadhillah, Zahra
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50133
• Institution: Institut Teknologi Bandung

Geothermal potential in Indonesia is very large because Indonesia is one of the countries which is bypassed by the ring of fire. Has conducted a survei about geothermal prospect in Indonesia. As of December 2013, 312 geothermal prospects were identified in Indonesia with a total potential of 28910 MWe / 28.9 GWe (Sukhyar, 2014). From the results of this survei, further research is needed for geothermal exploration in Indonesia so that it can be used as a national energy source. One method that can be used for estimating geothermal reservoars is the Magnetotellurik (MT) method. Through the analysis of the electric and magnetic fields of these electromagnetic waves, we can get a distribution of resistivity that can be associated with the material and the structure of subsurface structures. One of the expansion of the MT method is CSAMT or Magnetotelluric Audio Controlled Audio Source, the MT method that uses artificial sources with a frequency interval between 0.1 Hz to 10 kHz. CSAMT measurements at 42 points were carried out in the frequency range of 0.25 Hz - 8192 Hz. The transmitter is placed in the Cikole area, Lembang while the measurements are carried out to the north of the transmitter position with the transmitter-receiver distance of about 3-5 km. While the distance between the sounding between 200 m to 500 m which surrounds the Tangkuban Parahu and surrounding areas. From the results of the measurement, data processing and interpretation are carried out. Processing is done by 1D inversion using the ipi2win mt application. From processing and interpreting data on 42 points, initial estimates of geothermal reservoar locations are obtained at points T06, T07, T08, T18, T20, T22, T33, T38, T40, and T41. This is based on the structural profile which discusses the layer of the clay cap (low resistivity) in the second layer and the geothermal reservoar (high resistivity) in the third layer.