The Svartsengi reservoir in Iceland

Gudmundsson, J.S.; Þórhallsson, Sverrir

doi:10.1016/0375-6505(86)90025-8

Cited by 17 publications

(3 citation statements)

References 7 publications

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“…How,ever, the same general considerations apply. Superhydrostatic pressures in shallow steam zones have been observed at The Geysers (up to approximately 150% of hydrostatic at 150 m depth) [Allen and Day, 1927], Matsukawa (M. Hanano, unpublished data, 1986), Mud Volcanoes, Yellowstone (approximately 125% of hydrostatic at 106 m depth) [White et al, 1971], and Svartsengi, Iceland, where a "steam cap" is forming in response to exploitation [Gudrnundsson and Thorhallsson, 1986]. The stability of the "liquid over steam" configuration at the top of the vapor-dominated zone has been considered something of an enigma, though Schubert and Straus [1980] showed that this configuration will be stable in a medium with a uniform low permeability (< 4 x 10-• ?…”

Section: The Simulations Indicated With Parentheses Inmentioning

confidence: 68%

Vapor‐Dominated Zones Within Hydrothermal Systems: Evolution and Natural State

Ingebritsen¹,

Sorey²

1988

J. Geophys. Res.

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Three conceptual models illustrate the range of hydrothermal systems in which vapor‐dominated conditions are found. The first model (model I) represents a system with an extensive near‐vaporstatic vapor‐dominated zone and limited liquid throughflow and is analogous to systems such as The Geysers, California. Such systems can evolve within low‐permeability barriers without changes in boundary conditions or rock properties, given an adequate supply of heat. Their scarcity in nature may be due to the need for a long‐lived, potent heat source and for a low‐permeability aureole that remains intact for significant lengths of time. Models II and III represent systems with significant liquid throughflow and include steam‐heated discharge features at higher elevations and high‐chloride springs at lower elevations, connected to and fed by a single circulation system at depth. In model II, as in model I, the vapor‐dominated zone has a near‐vaporstatic vertical pressure gradient and is generally underpressured with respect to local hydrostatic pressure. The vapor‐dominated zone in model III is quite different, in that phase separation takes place at pressures close to local hydrostatic and the overall pressure gradient is near hydrostatic. A relatively large number of high‐temperature systems in regions of moderate to great topographic relief are similar to either model II or model III; however, in most cases there are insufficient data to establish a single preferred model.

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Section: The Simulations Indicated With Parentheses Inmentioning

confidence: 68%

Vapor‐Dominated Zones Within Hydrothermal Systems: Evolution and Natural State

Ingebritsen¹,

Sorey²

1988

J. Geophys. Res.

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“…The transtensional plate boundary causes significant seismic and volcanic activity with NE‐SW striking faults and fissures characterizing the area. The active volcanic systems derive their energy from cooling magma bodies in the crust, such as magma chambers, dykes, and other intrusions (Flóvenz et al, ; Gudmundsson, ; Gudmundsson & Thórhallsson, ). These important heat sources reach the surface and have been exploited since the settlement of Iceland in the ninth century.…”

Section: Geothermal Well Operationsmentioning

confidence: 99%

Short‐ and Long‐Term Variations in the Reykjanes Geothermal Reservoir From Seismic Noise Interferometry

Sánchez‐Pastor

Obermann

Schimmel

et al. 2019

Geophysical Research Letters

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The Reykjanes Geothermal System (RGS) is a high‐temperature geothermal system located on the Reykjanes peninsula, a transtensional plate‐boundary zone located on the southwestern tip of Iceland. The area is characterized by high seismicity, recent volcanism, and high‐temperature geothermal fields. We use seismic noise records from April 2014 to August 2015 to study stress changes and potential deformation of the subsurface caused by injection and production operations at RGS through seismic interferometry. We retrieve continuous time series of waveform similarity values and seismic velocity changes during this period. The S‐transform of the similarity values allows us to clearly identify three variations in the mechanical properties of the Reykjanes peninsula related to rapid changes of RGS production. In addition, we observe a slow seismic velocity decrease of 0.36%/year in the reservoir due to the water deficit and seasonal variations associated with the energy production demand.

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“…At that time, the only tracers that had been used in geothermal systems were the inorganic halide ions, either radioactive (MCCABE et al, 1983) or stable (HORNE et al, 1987), and two fluorescent dyes, fluorescein (GUDMUNDSSON et al, 1983) and rhodamine WT (GUDMUNDSSON et al, 1984). The stable halides suffer from high background concentrations in geothermal systems, which require that extremely large quantities be used for a tracer test.…”

Section: Introductionmentioning

confidence: 99%

Tracing Geothermal Fluids

Nash¹

2004

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The Svartsengi reservoir in Iceland

Cited by 17 publications

References 7 publications

Vapor‐Dominated Zones Within Hydrothermal Systems: Evolution and Natural State

Vapor‐Dominated Zones Within Hydrothermal Systems: Evolution and Natural State

Short‐ and Long‐Term Variations in the Reykjanes Geothermal Reservoir From Seismic Noise Interferometry

Tracing Geothermal Fluids

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