Open AccessIdentification of "WS" geothermal field system by analyzing TE, TM, and TE-TM of 2D magnetotelluric inversion models
Author(s) -
Triana Triana,
Tony Yulianto,
Udi Harmoko,
Iqbal Takodama
Publication year - 2019
Publication title -
journal of physics and its applications
Language(s) - English
Resource type - Journals
ISSN - 2622-5956
DOI - 10.14710/jpa.v1i2.4660
Subject(s) - magnetotellurics , electrical resistivity and conductivity , geology , geothermal gradient , mode (computer interface) , electric field , resistive touchscreen , mineralogy , geophysics , physics , electrical engineering , quantum mechanics , computer science , operating system , engineering
Magnetotelluric data has been carried out at the "WS" geothermal field to analyze the resistivity model resulting from 2D inversion of magnetotelluric data in TE, TM and TE-TM modes. Base on the three models produced, the mode is determined to produce the most representative model to assist in the interpretation of the "WS" geothermal system. There is a step of modes separation, namely TE (Tranverse Electric) and TM (Transverse Magnetic) modes in processing MT data. Each mode produces a 2D model with different conductivity properties. The analysis results of the three modes explain that TE mode is dominated by low resistivity with a range of values of 10-35 Ωm and medium resistivity with a value range of 35-250 Ωm and a vertical resistivity contrast. The TM mode describes the high resistivity in the Southwest and the center of the track with a value of more than 470 sehinggam resulting in lateral resistivity contrast. While the TE-TM mode produces a model that is not much different from TM mode, only the distribution of the resistivity value is a combination with TE mode. This mode describes the distribution of resistivity both vertically and laterally. Based on the analysis of the three modes, it can be concluded that the TE-TM mode is the mode that produces the most representative model. Interpretation model shows that from the TE-TM mode we have a low resistivity distribution (10-35 Ωm) represent a cap rock zone, reservoir rock with a medium resistivity distribution (35-380 Ωm), resistive zone with a high resistivity distribution (more than 380 Ωm), and the existence of the three of faults structures ro be a controller system of the "WS" geothermal.