Browsing by Author "Aklilu Hailu"

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    3D Joint Inversion of Gravity and Magnetics Data to Characterize the Geothermal Field and Reservoir Geometry Beneath the Tulu Moye Volcanic Complex, Central Main Ethiopian Rift
    (Addis Ababa University, 2024-06) Aklilu Hailu; Abera Alemu
    This study is conducted in the Central Main Ethiopian Rift (CMER) which is located 70km SE of Addis Ababa in Oromia Regional State East Arsi Zone. Geographically the area is bounded by 38.90-39.40 Longitude and 8.10-8.30 latitude. The study is meant to characterize the geothermal field and reservoir geometry beneath the Tulu Moye Volcanic Complex. Specifically, it is meant to define geothermal reservoir components like heat source, permeable zone, clay cap/ cap rock and recharge area of the geothermal system believed to exist in the study area. In the process the geometry and possible extent / volume of the geothermal system is also determined/ estimated. Ground gravity and ground magnetics data, which are collected using Lacoste and Romberg and GSM 19T proton precession magnetometer, respectively are primarily used to reach the main and specific objectives of the study. In addition to the main data, other a priori geoinformations like microseisms and resistivity survey results in the area are used to complement the study methodologies, data processing steps and result analysis. Microsoft products, Oasis montaj, Quantum GIS, and GRAVMAGINV3D applications and algorithms were deployed to organize, analyze, change discrete data to continuous surface, create derivative maps and generate 3D density and magnetic susceptibility models. The main methodology used in the study is 3D joint inversion of ground gravity and magnetics data to obtain 3D models of density and magnetic susceptibility. Both the 3D models obtained along with the a priori geo-information obtained from the area divulge presence of the anticipated main components (heat source, permeable zone/s, recharge area) of a typical geothermal system in the study area. Moreover, the study estimated the possible existent of the geothermal system believed to exist in the study area.