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  • 1
    Publication Date: 2017-06-10
    Description: Zur Nutzung von Erdwärme aus Teufen zwischen 2–5 km werden häufig Systeme aus einer Injektions- und Förderbohrung (‚Dubletten-System‘) genutzt. Dabei wird durch die Injektionsbohrung ein Fluid in den Untergrund verpresst, welches sich erhitzt und durch die Förderbohrung wieder an die Oberfläche gelangt. Ein wesentlicher Parameter für die produktive Nutzung von solchen Dubletten-Systemen ist eine hohe Permeabilität der Gesteine im Untergrund. Häufig werden in solchen geothermischen Reservoiren die Wegsamkeiten für Fluide von Brüchen kontrolliert, die bereits vorhanden sind oder künstlich erzeugt werden müssen (hydraulische Stimulation). Deshalb ist die Kenntnis über existierende Bruchgeometrien sowie Vernetzung der Bruchsysteme von fundamentaler Notwendigkeit zur Abschätzung der Permeabilität von geothermischen Reservoiren. Seismische Verfahren und Bohrkernanalysen besitzen im Allgemeinen dafür eine zu geringe Auflösung. Daher bieten sich dreidimensionale Rekonstruktionen des Bruchsystems aus analogen Obertageaufschlüssen an (vgl. Philipp et al. 2005; 2006)...
    Description: conference
    Keywords: VDH 110 ; VAE 150 ; TOO 000 ; VRG 000 ; Untere Trias ; Strukturelle Erscheinungen {Strukturgeologie} ; Geothermik {Geophysik} ; Geothermalfelder ; Karlshafen 〈Region〉 ; Reinhausen 〈Gleichen, Göttingen, Region〉 ; Mittlerer Buntsandstein ; Strukturgeologie ; Permeabiblität ; Geothermische Energie
    Language: German
    Type: anthologyArticle , publishedVersion
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  • 2
    Publication Date: 2017-06-10
    Description: Dykes are magma-driven extension fractures and the main conduits for magma in volcanic eruptions. To understand the mechanics of dyke emplacement is thus essential to assess volcanic hazards. To improve the understanding of the processes of dyke initiation from shallow magma chambers and dyke propagation through a mechanicallylayered crust, field measurements and observations from Tenerife (Canary Islands) are used and compared with the results from numerical models. Careful studies of 550 dykes in three profiles in the Anaga massif (Tenerife) include measurements of dyke geometry and orientation. The results of these measurements show that dykes have been injected from a deep-seated reservoir during the shield-building phase. Furthermore, the dyke attitudes agree with the main axial trends of Tenerife that are preserved in the old massifs of Teno, Anaga, and Roque del Conde...
    Description: conference
    Keywords: VAE 150 ; VEZ 130 ; Strukturelle Erscheinungen {Strukturgeologie} ; Inselgruppen {Atlantischer Ozean: Geologie} ; Teneriffa ; Gang 〈Geologie〉
    Language: German
    Type: anthologyArticle , publishedVersion
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  • 3
    Publication Date: 2017-06-10
    Description: Mineral veins form when water solutions passing through fluid-transporting fractures gradually seal the fractures as minerals precipitate. Many mineral veins are hydrofractures, that is, fractures generated at least partly by an internal fluid pressure. For most mineral veins, the fluid generating the hydrofracture is geothermal water. Other hydrofractures include fractures generated by magma (dykes, sills, inclined sheets), oil, gas and groundwater (many joints), as well as manmade hydraulic fractures in petroleum engineering. Hydrofractures are primarily extension fractures (Gudmundsson et al. 2002). The formation of hydrofractures is one of the two basic mechanisms for the generation and maintenance of permeability, particularly in fluid-filled heterogeneous reservoirs such as those commonly associated with petroleum, groundwater, volcanic and geothermal fields. The other, and better-known, mechanism for permeability development is the formation of shear fractures, that is, faults. The permeability development in fractured reservoirs, such as those for groundwater, geothermal water and petroleum, depends on fluid overpressure and transport in hydrofractures (Aguilera 1995). It has been proposed that a high fluid pressure in a reservoir can create high temporary permeability through hydrofracturing (Aguilera 1995; Gudmundsson et al. 2002). This hydrofracturing may result in mineral vein networks. Such palaeohydrofractures give information about past fluid flow and flow networks. Studying mineral veins is thus important for understanding fluid and mineral transport in rocks and reservoirs...
    Description: conference
    Keywords: VEC 218 ; VAE 150 ; VAE 400 ; VKB 380 ; South-West England {Geologie} ; Strukturelle Erscheinungen {Strukturgeologie} ; Tektogenese {Geologie} ; Sedimente bestimmter Regionen ; Somerset ; Trias ; Tonstein ; Silt ; Hydraulische Rissbildung ; Mineralgang ; Gips
    Language: German
    Type: anthologyArticle , publishedVersion
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