Reservoir Engineering Assessment of Dubti Geothermal Field, Northern Tendaho Rift, Ethiopia (Articolo in rivista)

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Label
  • Reservoir Engineering Assessment of Dubti Geothermal Field, Northern Tendaho Rift, Ethiopia (Articolo in rivista) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Alternative label
  • BATTISTELLI A., YIHEYIS A., CALORE C., FERRAGINA C., ABATNEH W. (2001)
    Reservoir Engineering Assessment of Dubti Geothermal Field, Northern Tendaho Rift, Ethiopia
    in Geothermics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • BATTISTELLI A., YIHEYIS A., CALORE C., FERRAGINA C., ABATNEH W. (literal)
Pagina inizio
  • 381 (literal)
Pagina fine
  • 406 (literal)
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  • Based on the results of our models and the recommendations in the updated technical-economical study, two additional wells were then successfully drilled by the Ethiopian Institute of Geological Surveys. Data from these wells confirmed the model predictions and the shallow reservoir can be exploited in order to supply fluid to a 3 - 3.5 MWe geothermal plant, which is sufficient to satisfy the base load requirements of a self-contained system supplying Central Afar users within a radius of 50 km, up to the year 2015. (literal)
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  • 31 (literal)
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  • Reservoir engineering studies integrated with geological, geophysical and geochemical data, led to the formulation of the first conceptual model of the Dubti hydrothermal area, individuating a shallow and a deeper geothermal reservoir and defining their main characteristics. This model was then verified quantitatively by numerical simulation, using the multicomponent, multiphase TOUGH2/EWASG code. A three- dimensional model of the Dubti fault area, showed that, according to the proven shallow field potential, development of this field could meet the predicted electricity requirements of Central Afar until the year 2015. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • Battistelli A.a, Yiheyis A. b, Calore C. c, Ferragina C. a and Abatneh W. b. a Aquater S.p.A. (ENI Group), Via Miralbello 53, 61047 San Lorenzo in Campo (PU), Italy.b Ethiopian Institute of Geological Surveys, BP 2302, Addis Ababa, Ethiopia.c International Institute for Geothermal Research, Area della Ricerca CNR, Via Moruzzi 1, 56124 Pisa, Italy. (literal)
Titolo
  • Reservoir Engineering Assessment of Dubti Geothermal Field, Northern Tendaho Rift, Ethiopia (literal)
Abstract
  • Following on surface exploration surveys performed during the 1970s and early 1980s, exploration drilling was carried out in the Tendaho Rift, in Central Afar (Ethiopia), from October 1993 to June 1995. Three deep and one shallow well were drilled in the central part of the Northern Tendaho Rift to verify the existence of a geothermal reservoir and its possible utilisation for electric power generation. The project was jointly financed by the Ethiopian Ministry of Mines and Energy and the Italian Ministry for Foreign Affairs. The main reservoir engineering data discussed in this paper were collected during drilling and testing of the above four wells, three of which are located inside the Dubti Cotton Plantation, in which a promising hydrothermal area was identified by surface exploration surveys. Drilling confirmed the existence of a liquid-dominated shallow reservoir inside the Dubti Plantation, characterised by a boiling-point-per-depth temperature distribution down to about 500 m depth. The main permeable zones in the Sedimentary Sequence, which is made up of lacustrine deposits, are located in correspondence to basalt lava flow interlayerings, or at the contact between volcanic and sedimentary rocks. At depth, the basaltic lava flows that characterise the Afar Stratoid Series seem to have low permeability, with the exception of fractured zones associated with sub-vertical faults. Two different upflows of geothermal fluids have been inferred: one flow connected to the Dubti fault feeds the shallow reservoir crossed by wells TD-2 and TD-4, where a maximum temperature of 245°C was recorded; the second flow seems to be connected with a fault located east of well TD-1, where the maximum recorded temperature was 270°C. A schematic conceptual model of the Dubti hydrothermal area, as derived from reservoir engineering studies integrated with geological, geophysical and geochemical data, has been tested by numerical simulation, using the TOUGH2/EWASG code. Preliminary simulations, using a three-dimensional numerical model of the Dubti fault area, showed that measured temperature and pressure distribution, as well as evaluated non-condensable gas pressure at reservoir conditions, are compatible with the rise of geothermal fluid, at about 290°C, along the sub-vertical Dubti fault from beneath the surface manifestations DB1, DB2 and DB3 located at the south-eastern end of the fault. According to the proven shallow field potential, development of this field could meet the predicted electricity requirements of Central Afar until the year 2015. (literal)
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