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Geology and gradient wells

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Titill: Geology and gradient wellsGeology and gradient wells
Höfundur: Kristján Sæmundsson 1936 ; KenGen ; Geothermal Development Company Ltd. ; Jarðhitaskóli Háskóla Sameinuðu þjóðanna ; United Nations University ; United Nations University, Geothermal Training Programme
URI: http://hdl.handle.net/10802/16092
Útgefandi: United Nations University
Útgáfa: 2017
Ritröð: United Nations University., UNU Geothermal Training Programme, Iceland. Short Course ; SC-25
Efnisorð: Jarðfræði; Jarðhiti; Jarðhitaleit; Borholur; Hitastigull
ISSN: 1670-794x
Tungumál: Enska
Tengd vefsíðuslóð: https://orkustofnun.is/gogn/unu-gtp-sc/UNU-GTP-SC-25-0208.pdf
Tegund: Bók
Gegnir ID: 991009894499706886
Athugasemdir: Presented at SDG Short Course II on Exploration and Development of Geothermal Resources, organized by UNU-GTP, GDC and KenGen, at Lake Bogoria and Lake Naivasha, Kenya, Nov. 9-29, 2017
Útdráttur: Drilling of gradient wells is a method used in exploration of both high- and lowtemperature geothermal fields. The applicability of the method depends on the permeability of the subsurface rock and the depth to groundwater. Low permeability is a prerequisite for the method to give reliable results because it is very important to avoid disturbance from internal flow of water inside wells. The drilling depth is accordingly anywhere from a few tens of metres to a few hundred metres. The latter may be necessary in areas of young or unaltered volcanics and low ground water level (such rocks are also as a rule costly to drill and secure from caving in). In fracture controlled low-temperature fields shallow boreholes come out best. This method has been applied also in high-temperature geothermal fields both as a regional survey and as testing the validity of indirect evidence (from geology or resistivity) of a potential. It is clear that knowledge of the hydrological conditions of the prospect area is needed, and also familiarity with the basic principles of hydrogeology.


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