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  • 1
    Publication Date: 2021-03-29
    Description: Fluid overpressures are well known from hydrocarbon exploration in many sedimentary basins. They can reach almost lithostatic values, and may cause the fracturing of rock. Fracturing allows the discharge of fluid overpressure, and fluid flows along a hydraulic gradient towards a low pressure reservoir. Different mechanisms may cause the precipitation from the fluid, such as a fluid pressure drop, a variation of temperature at the low pressure reservoir, or a different rock type inducing different Eh-pH conditions. Such precipitates in fractures are called veins, which often display paleo-fluid overpressures in rocks. In this study, we present some results from Devonian clastic sedimentary rocks of the Eifel area. Results are compared with other sedimentary basins to highlight some general aspects.
    Description: conference
    Keywords: 551 ; VAE 812 ; VAE 140 ; Variszisch-herzynische Orogene {Geologie} ; Gesteinsdeformation {Strukturgeologie} ; Rheinisches Schiefergebirge 〈West〉 ; Unterdevon ; Quarzgang ; Hydraulische Rissbildung
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
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  • 2
    Publication Date: 2021-03-29
    Description: Halite veins hosted in clastic sedimentary rocks are frequently observed next to evaporite layers. Their microstructure can be enhanced by gamma irradiation and etching, which can be used to infer the deformation mechanism of halite (e.g. Howard & Kerr 1960, Schleder & Urai 2005). In this study, we present results from gammadecorated vein microstructures of fibrous halite veins hosted in claystone.
    Description: conference
    Keywords: 551 ; VAE 160 ; VKA 200 ; VAE 140 ; Salztektonik {Strukturgeologie} ; Gefügekunde der Gesteine ; Gesteinsdeformation {Strukturgeologie} ; Steinsalz ; Mikrogefüge ; Deformation 〈Geologie〉 ; Salztektonik
    Language: German
    Type: anthologyArticle , publishedVersion
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  • 3
    Publication Date: 2021-03-29
    Description: This study focuses on clay smear processes during fault gouge evolution in sand-clay sequences at depths up to 2 km. A clay-rich fault gouge can dramatically lower the fault’s permeability, and prediction of this process is therefore relevant in groundwater modelling and hydrocarbon geology (Fulljames et al. 1997, Yielding et al 1997, van der Zee et al. 2003, 2005). We constructed an ‘underwater’ sandbox to deform layered sand-clay models of 20 × 40 × 20 cm above a 70°-dipping rigid basement fault. The experiments are run completely watersaturated to allow deformation of wet clay and cohesionless sand. The basement fault moves at 20 to 120mmh−1 to a maximum offset of 60 mm. We use quartz sand with grain size between 0.1 to 0.4mm and an illite-rich clay with a water content between 28 and 55 wt.%. Water content of the clay is used to control its shear strength and state of consolidation...
    Description: conference
    Keywords: 551 ; VAE 140 ; VAE 120 ; VAE 130 ; VBB 000 ; VKA 120 ; VKB 270 ; Gesteinsdeformation {Strukturgeologie} ; Methodik {Strukturgeologie} ; Geomechanik ; Experimentelle Geologie ; Experimentelle Petrologie ; Produkte mechanischer Deformation {Petrologie} ; Verwerfung ; Störungsletten ; Experiment
    Language: German
    Type: anthologyArticle , publishedVersion
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