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Remote Sensing Analysis and Preliminary Conceptual Model of the Geothermal Reservoir

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Remote Sensing Analysis and Preliminary Conceptual Model of the Geothermal Reservoir UNIVERSITÀ DEGLI STUDI DI PADOVA Dipartimento di Geoscienze Direttore Prof. Cristina Stefani TESI DI LAUREA MAGISTRALE IN GEOLOGIA E GEOLOGIA TECNICA THE ALID VOLCANIC DISTRICT (ERITREA): REMOTE SENSING ANALYSIS AND PRELIMINARY CONCEPTUAL MODEL OF THE GEOTHERMAL RESERVOIR Relatore: Prof. Antonio Galgaro Correlatore: Dott. Andrea Ninfo Laureando: Nicola Pirola ANNO ACCADEMICO 2014/2015 1 2 Index List of figures 5 Abstract 9 Introduction 11 1. The East African Rift System 15 1.1. Physiography 15 1.2. Tectonics 16 1.3. Seismicity 17 1.4. Volcanism 19 1.5. Rift evolution 19 1.6. Geothermal resources 22 2. Geology of the Study Area 27 2.1. Regional tectonic setting 27 2.2. Geology of Mount Alid and surrounding 28 2.3. Dome formation and magma evolution 37 3. Alid geothermal system 39 3.1. Shallow thermal manifestations 39 3.2. Reservoir temperature 41 3.3. Isotopic composition of thermal fluids 42 3.4. MT-TEM geophysical survey 43 4. Modelling the geothermal system 45 4.1. Reservoir identification 45 4.2. Conceptual model of the reservoir 48 4.3. 3D model of the reservoir 50 4.4. Modelling with Petrasim 52 4.5. Simulation Results 56 5. Remote sensing analysis - materials 61 5.1. Basics of remote sensing 61 5.2. Landsat 8 data products 63 5.3. ASTER L1B data products 64 3 5.5. CGIAR SRTM 90 m digital elevation data 66 5.6. ASTER GDEM V2 67 5.7. National Eritrean DEM 67 5.8. Bing and Google maps imagery 67 5.9. National Eritrean geological map 68 5.10. USGS simplified geological map 68 6. Remote sensing analysis - results 69 6.1. ALOS DEM validation 69 6.2. Preprocessing of Landsat 8 images 76 6.3. Landsat 8 false colour compositions 78 6.4. Supervised Classification 82 6.5. ArcGIS geodatabase realization 84 6.6. Geological map 84 6.7. Processing of ASTER images and thermal analysis attempt 90 7. Discussion and conclusions 95 Acknowledgements 99 References 101 Appendix A 113 Appendix B 117 Appendix C 121 Appendix D 123 Appendix E 125 4 List of figures Figure 1. a) Position of Afar triangle and the Eritrean country; b) location of the Alid volcanic district; c) simplified geologic map of the Alid graben; d) Landsat 8 natural colour image of the study area (modified from Lowenstern et al., 2006). ........................ 12 Figure 2. Main structures of the northern part of EARS: the white arrows show the spreading directions of the three main arms, with the relative spreading rate in mm/y. ... 15 Figure 3. Simplified structural map and west-to-east sketch cross-section from Asmara to Gulf of Zula (Eritrea). Solid areas are laterite plus basalt cover. ...................................... 16 Figure 4. Cartoon sketch of the rift, showing the localization of seismicity in concomitance with magmatic intrusions (Keir et al. 2006). ............................................. 17 Figure 5. Earthquake distribution in the Afar Triangle and in the Ethiopian rift, from October 2001 to January 2003, and associated focal mechanisms (Corti, 2009). ............. 18 Figure 6. Schematic model of EARS evolution stages of the EARS evolution, from incipient rift to initial crust breakup (Modified after Ebinger, 2005). .............................. 21 Figure 7. Geothermal potential of the East-African Rift Valley (http://www.geo- t.de/en/project-development/worldwide). ......................................................................... 22 Figure 8. Simplified tectonic map of the Afar region. The Danakil depression, in which the Alid mountain is located, is strictly related to the Red Sea crustal extension (modified from Barberi & Vallet, 1977). .......................................................................................... 27 Figure 9. Simplified geologic map and schematic cross section of the Alid dome (modified from Duffield et al, 1996). ............................................................................... 29 Figure 10. The Ilegedi thermal pool outcropping in the altered Precambrian basement (Gersman, 2005). ............................................................................................................. 30 Figure 11. An outcrop of sedimentary sequence on the north-western flank of the mountain (source: Ghinassi, 2015). .................................................................................. 31 Figure 12. An outcrop of the Lava Shell formation, in which the different rock composition is evident (source: Ghinassi, 2015). ............................................................. 32 Figure 13. Flow banding in a rhyolite deposit (source: Ghinassi, 2015). ......................... 33 Figure 14. Satellite image of the Alid, in which the four different deposits of rhyolitic lava are highlighted. ......................................................................................................... 33 Figure 15. Bing image in which pumice deposit draping the crest of Mt Alid’s crater have been bordered in red. ........................................................................................................ 34 Figure 16. A detail of the pumice deposit outcropping in Figure 15, in which xenoliths are found (source: Ghinassi, 2015). ....................................................................................... 35 Figure 17. Bing image of the southern flank of Mt. Alid, in which scoria cones have been bordered with a red line and basaltic flows with a yellow line. ........................................ 36 Figure 18. Contact between alluvial deposits and the recent basaltic flows (source: Duffield, 1996). ................................................................................................................ 36 Figure 19. Image of the Alid dome taken from south-west (Duffield, 1996). .................. 37 5 Figure 20. Satellite image in which Mt. Alid’s fumaroles are pointed with the red dots. 39 Figure 21. Gas samples of Alid fumaroles and their relative concentrations. .................. 40 Figure 22. Stable isotope variation diagram for δO18 and δD in units of per mil (‰) relative to VSMOW. ....................................................................................................... 42 Figure 23. Resistivity cross section (relative to the red line on the map above), in which four resistive layers appear and the heat source seems to be confined on the western flank of the mountain (Eysteinsson et al., 2010). ...................................................................... 44 Figure 24. Icelandic interpretation of resistivity structure in high-temperature geothermal fields (Tsend-Ayush, 2006). ............................................................................................ 45 Figure 25. Simplified cross-section of the Alid volcanic complex (Duffield et al., 1996). ........................................................................................................................................ 46 Figure 26. NW-SE resistivity cross-section. The geothermal reservoir is the blue, resistive zone at the centre (Eysteinsson et al., 2010). ................................................................... 46 Figure 27. Iso-resistivity maps obtained from MT-TEM geophysical data (Eysteinsson et al., 2010). ........................................................................................................................ 47 Figure 28. Schematic stratigraphic column of the western flank of the Alid complex..... 48 Figure 29. Thermal and hydraulic properties chosen for the lithologies constituting the Alid subsoil. .................................................................................................................... 50 Figure 30. Petrel screenshot in which georeferenced resistivity cross-sections are shown. ........................................................................................................................................ 51 Figure 31. Results of surfaces interpolation from resistivity cross-sections of Figure 30. 51 Figure 32. PreliminaryTemperature-Depth (a) and Pressure-Depth curves estimation. ... 52 Figure 33. Polygonal mesh of the three-dimensional model representing the Alid geothermal reservoir. ....................................................................................................... 53 Figure 34. Hydraulic and thermal properties of the materials constituting the 3D model. ........................................................................................................................................ 54 Figure 35. The four features added to the model: the heat source (a), the fumarole (b), the recharge (c) and the link between the aquifer and the geothermal reservoir (d). ............. 55 Figure 36. The final version of the three-dimensional mesh, in which the other four features have been added. ................................................................................................ 56 Figure 37. Temperature distribution within the natural-state geothermal model, including heat flux vectors. ............................................................................................................. 57 Figure 38. Temperature-Depth graph related to the simulation results. ........................... 57 Figure 39. Pressure distribution within the natural-state geothermal model and flow vectors. ............................................................................................................................ 58 Figure 40. Pressure-Depth graph related to the results of the simulation. ........................ 58 Figure 41. Vapour fraction within the modelled geothermal
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