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Improving geophysical resolution with magnetotelluric and gravity joint inversion: application to the Asal Rift geothermal region
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Workshop on Geothermal Energy and Hydro Power in Africa, Dec 2020, Volume 2020, p.1 - 5
Abstract
Magnetotellurics (MT) provides images of the low resistivity alteration characteristic of hydrothermal alteration usually associated with an active upflow. The accuracy of the resistivity images is therefore an important factor in the definition of the conceptual model. The sensitivity of MT decreases with depth. To improve the geophysical image, we investigate how to combine MT, gravity and borehole data in the Asal Rift region in Republic of Djibouti. In this preliminary study, we present the magnetotelluric and gravity data recently recovered from old databases and tested through 1-D inversion and 3-D forward modeling (MT) and 3-D linear inversion (Gravity). The results are encouraging to go forward with 3-D MT inversion and gravity inversion constrained by MT results..