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Geothermal systems in global perspective

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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 2018-07-31T09:31:46Z
dc.date.available 2018-07-31T09:31:46Z
dc.date.issued 2017
dc.identifier.issn 1670-794x
dc.identifier.uri http://hdl.handle.net/10802/16086
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 Geothermal systems are classified in three main categories: (a) volcanic geothermal systems with the heat source being hot intrusions or magma chambers in the crust, (b) convective systems with deep water circulation in tectonically active areas preferably of high geothermal gradient, (c) sedimentary systems with permeable layers at great depth (2-5 km), including geo-pressured systems often found in conjunction with oil resources. Some 50 years ago geothermal fields were divided into high- and low- temperature fields or areas. This division was based on (arbitrarily) inferred temperature at 1 km depth. It was soon realized that most of the former are related to volcanism (>160 - >300 °C) (category a) and that the latter draw heat from the general heat flow of the crust (just above ambient to >160°C) (categories b and c). The temperature range given here is based on values measured in boreholes in Iceland or silica and gas geothermometry. Other subdivisions have been proposed by adding an intermediate group between the two main ones. There are several types in each of the two main groups. They are described below, emphasizing the geological control. A fourth category constitutes the so called hot dry rock. The thermal resource there is abnormally hot, usually intrusive rock of very low permeability and not harnessable so far. is
dc.format.extent 1 rafrænt gagn (12 bls.). is
dc.language.iso en
dc.publisher United Nations University is
dc.relation.ispartof 001499972
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-25-0202.pdf
dc.subject Jarðhiti is
dc.subject Jarðhitakerfi is
dc.title Geothermal systems in global perspective en
dc.type Bók is
dc.identifier.gegnir 001500002


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