| Title | Processing and Joint 1D Inversion of Mt and Tem Data from Alallobeda Geothermal Field |
|---|---|
| Authors | Getenesh Hailegiorgis Abebe |
| Year | 2016 |
| Conference | ARGeo |
| Keywords | Tendaho-3 (Alallobeda prospect), resistivity, joint interpretation, Ethiopia |
| Abstract | Tendaho is one of the high temperature geothermal field in the Main Ethiopian Rift, NE-Ethiopia and a promising area for geothermal development with respect to both its size and location. Alallobeda is one of the three prospects found in Tendaho geothermal field. Understanding the resistivity structure of Alallobeda prospect could give a good understanding of the subsurface and enhance the possibility of developing the geothermal resource. The resistivity structure of Alallobeda prospect was carried out by the combined use of MT and TEM soundings. The soundings were jointly inverted to get a better result and interpretation. Joint 1-D inversion of 54 MT/TEM sounding pairs was performed. From the resistivity Cross-sections in Alallobeda three main resistivity layers were observed. The first is a thin layer of very low resistivity (< 10Ùm) at shallow depth down to 300 m b.s.l. which is correlated with sedimentary formation or smectite zeolite zone. The second layer is a high resistivity core appears down to a depth of 1000 to 5000 m b.s.l. which can be correlated to the less Afar Stratoid Series and high alteration minerals. Beneath the high resistivity layer a deep conductor is revealed that could be associated with heat source. Effect of geothermal up flow is seen in the iso-resistivity map associated with known geothermal structures. Results from the strike analysis are in an agreement with the resistivity model. |