{"title":"Integrated geological and 2D electrical resistivity tomography for assessment of geothermal potential in Dilla area, Southern Main Ethiopian Rift","authors":"Getnet Assefa , Tariku Takele , Tariku Degife , Demise Tadessa , Amare Kassie , Abebayehu Tadesse , Asaye Getenet","doi":"10.1016/j.geothermics.2025.103395","DOIUrl":null,"url":null,"abstract":"<div><div>This study aims to assess the geothermal potential in the Dilla area, Southern Main Ethiopian Rift using integrated geological mapping and electrical resistivity tomography (ERT) technique. The ERT survey profiles were conducted around the six hot spring sites to examine the subsurface geological units and structures that suggest the presence of shallow geothermal systems based on Wenner electrode array type configuration. Geologically, silicic volcanic rocks and hot springs are predominantly concentrated in the western region, in which hot springs aligned along north south trending fault lines with discharge temperatures ranges from 25 °C to 80 °C. The ERT surveys conducted around Bersiso, Dilla University, and Odomike profiles indicates zone of low resistivity (< 200 Ω·m) beginning at approximately 15 m depth and continuing downward corresponds to shallow geothermal reservoirs. These layers are overlain by impermeable cap rocks which exhibiting high resistivity values (>1500 Ω·m). The finding of this study reveal that hot springs are mainly situated along the east-dipping normal faults that act as conduits for the upward migration of geothermal fluids possibly from shallow heat source. The analysis result of the ERT was cross-checked with the lithological logs and indicates reliable output showcasing the applicability of the techniques for shallow geothermal exploration. The study suggest that the geothermal potential zones are mainly concentrated along fault zones highlighting Odomike and Bersiso hot spring sites could be applicable for geothermal development.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103395"},"PeriodicalIF":3.9000,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geothermics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0375650525001464","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
This study aims to assess the geothermal potential in the Dilla area, Southern Main Ethiopian Rift using integrated geological mapping and electrical resistivity tomography (ERT) technique. The ERT survey profiles were conducted around the six hot spring sites to examine the subsurface geological units and structures that suggest the presence of shallow geothermal systems based on Wenner electrode array type configuration. Geologically, silicic volcanic rocks and hot springs are predominantly concentrated in the western region, in which hot springs aligned along north south trending fault lines with discharge temperatures ranges from 25 °C to 80 °C. The ERT surveys conducted around Bersiso, Dilla University, and Odomike profiles indicates zone of low resistivity (< 200 Ω·m) beginning at approximately 15 m depth and continuing downward corresponds to shallow geothermal reservoirs. These layers are overlain by impermeable cap rocks which exhibiting high resistivity values (>1500 Ω·m). The finding of this study reveal that hot springs are mainly situated along the east-dipping normal faults that act as conduits for the upward migration of geothermal fluids possibly from shallow heat source. The analysis result of the ERT was cross-checked with the lithological logs and indicates reliable output showcasing the applicability of the techniques for shallow geothermal exploration. The study suggest that the geothermal potential zones are mainly concentrated along fault zones highlighting Odomike and Bersiso hot spring sites could be applicable for geothermal development.
期刊介绍:
Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field.
It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.