Identification of "WS" geothermal field system by analyzing TE, TM, and TE-TM of 2D magnetotelluric inversion models

Triana Triana  -  Physics Undergraduate Study Program, Department of Physics, Universitas Diponegoro, Indonesia
Tony Yulianto  -  Department of Physics, Universitas Diponegoro, Indonesia
*Udi Harmoko scopus  -  Department of Physics, Universitas Diponegoro, Indonesia
Iqbal Takodama  -  Pusat Sumber Daya Mineral Batubara dan Panas Bumi, Indonesia
Received: 9 Apr 2019; Accepted: 30 May 2019; Published: 20 Jun 2019; Available online: 12 Jun 2019.
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Abstract

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.

Keywords
Magnetotelluric;Geothermal system;TE mods (Transverse Electric);TM mode (Transverse Magnetic)

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