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Geology and gradient wells

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dc.contributor KenGen is
dc.contributor Geothermal Development Company Ltd. is
dc.contributor Jarðhitaskóli Háskóla Sameinuðu þjóðanna is
dc.contributor United Nations University is
dc.contributor United Nations University, Geothermal Training Programme is
dc.contributor.author Kristján Sæmundsson 1936 is
dc.date.accessioned 2018-07-31T09:32:47Z
dc.date.available 2018-07-31T09:32:47Z
dc.date.issued 2017
dc.identifier.issn 1670-794x
dc.identifier.uri http://hdl.handle.net/10802/16092
dc.description 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 is
dc.description.abstract 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. is
dc.format.extent 1 rafrænt gagn (9 bls.). is
dc.language.iso en
dc.publisher United Nations University is
dc.relation.ispartof 991009892409706886
dc.relation.ispartofseries United Nations University., UNU Geothermal Training Programme, Iceland. Short Course ; SC-25
dc.relation.uri https://orkustofnun.is/gogn/unu-gtp-sc/UNU-GTP-SC-25-0208.pdf
dc.subject Jarðfræði is
dc.subject Jarðhiti is
dc.subject Jarðhitaleit is
dc.subject Borholur is
dc.subject Hitastigull is
dc.title Geology and gradient wells en
dc.type Bók is
dc.identifier.gegnir 991009894499706886


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