RESISTIVITY SUBSURFACE MODELLING USING CONTROLLED SOURCE AUDIO-FREQUENCY MAGNETOTELLURICS (CSAMT) DATA

• Main Author: OKTAMA AULIA AKBAR - NIM: 12314006 , MUHAMMAD
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29302
• Institution: Institut Teknologi Bandung

<p align="justify">Controlled Source Audio-Frequency Magnetotellurics (CSAMT) is an extension of from magnetotelluric (MT) method that uses artificial source with frequency band from 0,1 Hz to 10 kHz. CSAMT provides a stable signal and higher Signal to Noise (S/N) ratio than natural-source MT. This research discusses 1-D and 2-D resistiviy modelling from CSAMT data with WinGlink software that is usually used for MT data. We assumed that the CSAMT data fulfill the far-field condition. Results from a geothermal field in North Sulawesi show thick conductive layer (<10 &#8486;.m) in the middle thinning to the northeast and southwest. The conductive layer is interpreted as a clay cap of the geothermal system that enclose the reservoir zone (10–100 &#8486;.m). The final model is in agreement with geology of the area. The use of the fullsolution of CSAMT modelling is expected to result in a more representative subsurface model. <p align="justify">