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Geochemistry of thermal waters from Al-Lisi - Isbil geothermal field, Dhamar Governorate, Yemen

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Titill: Geochemistry of thermal waters from Al-Lisi - Isbil geothermal field, Dhamar Governorate, YemenGeochemistry of thermal waters from Al-Lisi - Isbil geothermal field, Dhamar Governorate, Yemen
Höfundur: Al-Kohlani, Taha Ahmed M. ; Jarðhitaskóli Háskóla Sameinuðu þjóðanna
URI: http://hdl.handle.net/10802/6673
Útgefandi: United Nations University; Orkustofnun
Útgáfa: 2009
Ritröð: United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 2008-10
Efnisorð: Jarðhiti; Efnastyrkur; Jarðefnafræði; Jemen
ISSN: 1670-7427
Tungumál: Enska
Tengd vefsíðuslóð: http://www.os.is/gogn/unu-gtp-report/UNU-GTP-2008-10.pdf
Tegund: Bók
Gegnir ID: 001112150
Athugasemdir: Í : Geothermal training in Iceland 2008, s. 53-76Myndefni: myndir, gröf
Útdráttur: The Al-Lisi – Isbil geothermal and volcanic field, one of Yemen’s important fields, is known for its fumaroles, steaming grounds and hot wells. The area is mainly composed of basaltic lava flows, stratified basic tuffs and agglomerate pyroclastics. Less common are differentiated rock-types like rhyolite. The Al-Lisi volcano is though an exception which consists entirely of acidic lava flows (rhyolite, obsidian, acidic tuffs and ash rings). Chemical analyses from 29 shallow water wells from the Al-Lisi – Isbil area were reviewed. All the data were interpreted using the WATCH program for speciation and by mineral equilibrium diagrams and other graphical presentations and classifications. The maximum reservoir temperature for the wells, predicted by calculation of various geothermometers, exceeds 100°C. There is evidence of mixing with cold water. The thermal fluid is of bicarbonate type and the reservoir rocks consist mainly of sandstone (Tawilah Formation) at 1000 to 1500 m depth.


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