Numerical Modelling of Subsidence in Geothermal Reservoirs : Case Study of the Svartsengi Geothermal System, SW Iceland

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dc.contributor.author De Freitas, Melissa Anne is
dc.date.accessioned 2019-01-09T17:00:55Z
dc.date.available 2019-01-09T17:00:55Z
dc.date.issued 2018
dc.identifier.isbn 9789979684862
dc.identifier.isbn 9789979684855
dc.identifier.issn 1670-7427
dc.identifier.uri http://hdl.handle.net/10802/17059
dc.description Meistaraprófsritgerð frá Háskóla Íslands is
dc.description.abstract The Svartsengi-Eldvörp geothermal system is a high-temperature system situated within the Reykjanes Peninsula oblique rift in south-west Iceland, a part of the boundary between the North America and Eurasia plates. Extensive regional ground subsidence ranging from 7 to 14 mm/year has been observed from 1975 to 2015, with the maximum changes in elevation detected in the production field at Svartsengi. Numerous studies done throughout the years have sought to identify and isolate the various signals that contribute to the observed subsidence. Recently, the combined analysis of a variety of geodetic studies have proposed a natural subsidence velocity of 6 mm/year along the central volcanic rift within the Reykjanes Peninsula. This project however, seeks to contribute to the existing deformation studies at Svartsengi by setting up a TOUGH2 numerical model of the Svartsengi geothermal system, calibrated against the average annual mass extraction and reinjection rates from 1975 to 2015. One-dimensional subsidence modelling was performed with the model, using a newly developed subsidence module in iTOUGH2. The model reveals that high permeabilities, pressure drawdown and changes in the rates of production and reinjection have been major factors that have influenced the contribution of geothermal production to the total observed vertical deformation at Svartsengi. Modelled results indicate an average subsidence velocity of 3-4 mm/year as a result of mass extraction due to geothermal activity. Coupled with the natural subsidence value previously determined, this value is capable of accurately representing the total subsidence observed at Svartsengi. This numerical model is therefore a valuable tool for predicting subsidence rates due to future production at Svartsengi and Eldvörp. is
dc.format.extent 1 rafrænt gagn (viii, 62 bls.). is
dc.language.iso en
dc.publisher Jarðhitaskóli Háskóla Sameinuðu þjóðanna is
dc.publisher Orkustofnun is
dc.relation.ispartofseries United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 2018:05
dc.relation.uri https://orkustofnun.is/gogn/unu-gtp-report/UNU-GTP-2018-05.pdf
dc.subject Jarðeðlisfræði is
dc.subject Jarðhiti is
dc.subject Háhitasvæði is
dc.subject Reiknilíkön is
dc.subject Svartsengi is
dc.subject Eldvörp is
dc.title Numerical Modelling of Subsidence in Geothermal Reservoirs : Case Study of the Svartsengi Geothermal System, SW Iceland en
dc.type Bók is
dc.identifier.gegnir 991010981559706886


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