Details of the abstract
| Title of paper |
Two-dimensional electrical resistivity model of Sabalan geothermal field using Magnetotelluric data |
| List of authors |
Gholam Abbas Fanaee Kheirabad , Behrooz Oskooi |
| Affiliation(s) |
Mining Department, Birjand University of Technology, Birjand, Iran. Institute of Geophysics, University of Tehran, Tehran, Iran. |
| Summary |
The Sabalan Magnetotelluric (MT) survey discussed in this paper was carried out in November 2007. MT field components in the frequency band 0.002 – 320 Hz were collected at 28 sites at an average distance of 1.4 kilometer. The selected profile with seven MT stations in the region crosses over the hydrothermally altered zones and perpendicular to the main geological structures. The subsurface resistivity structure was modeled to assess the size of the geothermal resources and to prepare conceptual model for the hydrology of the geothermal fluid reservoirs. The MT sites were projected to a line for two dimensional (2-D) modeling. Electrical resistivity and impedance phase models were computed for TM and joint TE and TM mode data. These models resolved a good correlation between the features of the geothermal field and resistivity distribution at depth. The resulting models reveal the presence of a resistive cover layer underlain by an anomalous conductive layer at about 500 -1000 m below the ground surface. A very low resistivity (3 - 5 ohm-m) feature at the depths below 2000 m, bounded by two more resistive (100 - 500 ohm-m) features that interpreted as the main heat source of the geothermal system. At shallow depths, the resistivity model obtained from the MT data is consistent with the general conceptual resistivity model proposed for high-temperature geothermal systems at literatures. |
| Session Keyword | 3.0 Exploration, Monitoring and Hazards |
| File upload |
3.0_two-dimensional_electrica_fanaee_01.pdf
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