Rachid Robleh Ragueh , Pascal Tarits , Sophie Hautot , Mohamed Jalludin , Mohamed Osman Awaleh
{"title":"三维电阻率模型约束下的三维重力反演:对阿萨尔裂谷(吉布提共和国)Fiale火山口和Gale-le-Koma地热远景概念模型的启示","authors":"Rachid Robleh Ragueh , Pascal Tarits , Sophie Hautot , Mohamed Jalludin , Mohamed Osman Awaleh","doi":"10.1016/j.geothermics.2025.103383","DOIUrl":null,"url":null,"abstract":"<div><div>Geothermal systems in the context of very active rifting, such as in the Republic of Djibouti, are complex to characterize. Despite the numerous geoscientific studies conducted over decades in recognized prospects such as Fiale Caldera and Gale-le-Koma in the Asal Rift, we do not understand well the mechanism of the geothermal resources, their relationships with the heat source at depth and the recharge of water. In an attempt to progress in this understanding, we present an analysis of 3-D gravity data inversion guided by a new three-dimensional electrical model to obtain constrained density models for each geothermal site. These models along with the resistivity model revealed highly fractured underground structures primarily influenced by two processes: geothermal activity from the rift and structural control from the active rift tectonics. These models are in good agreement with the lithology from boreholes, as well as with geochemical and hydrogeological data. The study presents revised conceptual models for the two geothermal systems. These conceptual models consist of a shallow reservoir and a deep reservoir at each site (Fiale Caldera and Gale-le-Koma geothermal prospects), primarily recharged by seawater from the Bay of Ghoubbet and possibly by regional meteorological groundwater recharges.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"131 ","pages":"Article 103383"},"PeriodicalIF":3.9000,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"3D gravity inversion constrained by a 3D resistivity model: Implication for the conceptual models of Fiale caldera and Gale-le-Koma geothermal prospects in the Asal Rift (Republic of Djibouti)\",\"authors\":\"Rachid Robleh Ragueh , Pascal Tarits , Sophie Hautot , Mohamed Jalludin , Mohamed Osman Awaleh\",\"doi\":\"10.1016/j.geothermics.2025.103383\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Geothermal systems in the context of very active rifting, such as in the Republic of Djibouti, are complex to characterize. Despite the numerous geoscientific studies conducted over decades in recognized prospects such as Fiale Caldera and Gale-le-Koma in the Asal Rift, we do not understand well the mechanism of the geothermal resources, their relationships with the heat source at depth and the recharge of water. In an attempt to progress in this understanding, we present an analysis of 3-D gravity data inversion guided by a new three-dimensional electrical model to obtain constrained density models for each geothermal site. These models along with the resistivity model revealed highly fractured underground structures primarily influenced by two processes: geothermal activity from the rift and structural control from the active rift tectonics. These models are in good agreement with the lithology from boreholes, as well as with geochemical and hydrogeological data. The study presents revised conceptual models for the two geothermal systems. These conceptual models consist of a shallow reservoir and a deep reservoir at each site (Fiale Caldera and Gale-le-Koma geothermal prospects), primarily recharged by seawater from the Bay of Ghoubbet and possibly by regional meteorological groundwater recharges.</div></div>\",\"PeriodicalId\":55095,\"journal\":{\"name\":\"Geothermics\",\"volume\":\"131 \",\"pages\":\"Article 103383\"},\"PeriodicalIF\":3.9000,\"publicationDate\":\"2025-05-19\",\"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/S0375650525001348\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geothermics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0375650525001348","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}
3D gravity inversion constrained by a 3D resistivity model: Implication for the conceptual models of Fiale caldera and Gale-le-Koma geothermal prospects in the Asal Rift (Republic of Djibouti)
Geothermal systems in the context of very active rifting, such as in the Republic of Djibouti, are complex to characterize. Despite the numerous geoscientific studies conducted over decades in recognized prospects such as Fiale Caldera and Gale-le-Koma in the Asal Rift, we do not understand well the mechanism of the geothermal resources, their relationships with the heat source at depth and the recharge of water. In an attempt to progress in this understanding, we present an analysis of 3-D gravity data inversion guided by a new three-dimensional electrical model to obtain constrained density models for each geothermal site. These models along with the resistivity model revealed highly fractured underground structures primarily influenced by two processes: geothermal activity from the rift and structural control from the active rift tectonics. These models are in good agreement with the lithology from boreholes, as well as with geochemical and hydrogeological data. The study presents revised conceptual models for the two geothermal systems. These conceptual models consist of a shallow reservoir and a deep reservoir at each site (Fiale Caldera and Gale-le-Koma geothermal prospects), primarily recharged by seawater from the Bay of Ghoubbet and possibly by regional meteorological groundwater recharges.
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.