Abstract
Tendaho geothermal field is one of the first priorities for the development of power generation on the basis of its proximity to electric power grid, level of study compared to other geothermal prospects, and its huge potential since it is found in the afar triple junction. The present review and reinterpretation of geophysical data were performed with the objectives of improving the understanding of the subsurface of Tendaho geothermal fields, delineate geothermal reservoirs, and locate exploration drilling sites. After correcting for the magnetic and gravity field variations that are unrelated to the earth’s crust, several filters were applied to the reduced data, so that anomalies of interest can be enhanced and displayed in a more interpretable manner. Three high residual gravity ridges separated by three gravity ridges separated gravity lows are reflection of subsurface rift configurations imprinted on Afar stratoid basalts. Computation of horizontal gravity gradients enabled to map the contact between masses of different densities. With such edge enhancement fault/contacts, calderas, craters, domes and vents are outlined. The magnetic method defined the axial region of the Tendaho rift which coincides with the central high gravity ridge. Estimates of vertical and horizontal positions have been made using Euler 3D deconvolution for fault, and sill/dyke models. Such models enabled to construct faults blocks constituting two half grabens separated by hinged high blocks with central depression. Geologically mapped thermal manifestations and craters bear positional correlations with the geophysical interpreted faults, ring fractures, calderas, craters, and vents. Both gravity and magnetic data show that the Tendaho graben is severely affected by fault systems, trending NW, NE, EW, and NS Stacking of the direct current (DC) and magnetotelluric geo‐electric sections, digitizing resistivity structures and integrating the various geo‐data helped to extract useful subsurface information. Depths to resistive basement, estimated using the DC and MT methods, imaged the corrugated nature of the subsurface structure. The central uplifted
دكتور / عبدالعاطي بدر سالمان جيولوجي استشاري، مصر [email protected]
دكتور: عبدالعاطي بدر سالمان
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