361 Works

Does regional geology help to assess earthquake hazard in continental interiors?

Tim Hahn, Jonas Kley, Diethelm Kaiser & Thomas Spies
Earthquake hazard assessment is crucial for different planning tasks, including the search for a German nuclear waste repository. Germany is located in an intraplate setting with a low level of seismicity and the seismically active faults are incompletely known. To solve this problem, seismotectonic regions (SR) of assumed uniform seismicity can be defined and used as a basis to define seismic area sources to be used in seismic hazard analyses. We have elaborated a new...

Biological productivity in the Southern Ocean across the Eocene-Oligocene transition

Gabrielle Rodrigues de Faria, Volkan Özen, David Lazarus, Ulrich Struck, Johan Renaudie & Gayane Asatryan
The Eocene-Oligocene transition (EOT, ~34Ma) marks a dramatic climate change and carbon cycle perturbation in the Cenozoic. Understanding the variations in export productivity associated with EOT provides important information about the feedback in regulating climate. We use the new generated benthic and planktonic oxygen and carbon isotope records combined with paleoproductivity proxies - Biological Barium [bio-Ba MAR] and benthic foraminifera accumulation rates [BFAR] - to infer variations in productivity during the EOT period in relation...

Recovery of lithium by ion-exchange in zeolitic materials

Rosa Micaela Danisi & Frank Schilling
More than 70% of the global lithium resources are not solid minerals but dissolved salts within continental brines or geothermal waters. Critical issues in the exploitation of such deposit include low Li concentrations and high level of impurities that need to be discarded. One of the most important methods for Li acquisition from brines is ion-exchange. In this perspective, the use of zeolitic materials as ion-exchangers in lithium extractions can potentially represent a fast and...

Increasing the knowledge base for Deep Geothermal Energy Exploration in the Aachen-Weisweiler area, Germany, through 3D probabilistic modeling with GemPy

Alexander Jüstel (1), Florian Wellmann (2) & Frank Strozyk (1)
1Fraunhofer IEG, Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems, Am Hochschulcampus 1, 44801 Bochum, Germany; 2RWTH Aachen University, Computational Geoscience and Reservoir Engineering, Wüllnerstraße 2, 52062 Aachen, Germany Deep geothermal energy is a key to lower local and global CO2 emissions caused by the burning of fossil fuels. Different initiatives aim at establishing deep geothermal energy production at the Weisweiler coal-fired power plant near the city of Aachen, Germany, in order to replace...

Drivers of Topography in Fold-thrust Belts: A Perspective from Central Nepal

Paul R Eizenhöfer, Nadine McQuarrie & Suryodoy Ghoshal(
Topography in fold-thrust belts over geologic time reflects the development of an orogenic Coulomb wedge that represents a balance of tectonic and erosional forcings. The establishment of critically tapered topography is generally viewed under two contrasting mechanical frameworks: (i) shortening and rock uplift are occurring everywhere suggesting an orogenic wedge under mechanical failure everywhere; and (ii) rock displacement takes place along discrete fault planes, including the translation of uplifted topography laterally. Here we investigate whether...

Simulation study of hydrate formation from dissolved methane in the LArge-scale Reservoir Simulator (LARS)

Zhen Li , Thomas Kempka , Erik Spangenberg & Judith Schicks
Hydrate formation from dissolved methane in saline solutions is a hydrochemical process, resulting in the accumulation of gas hydrates in sedimentary strata under the seafloor or overlain by permafrost regions. In the scope of the SUGAR framework, LARS has been established to study gas hydrate formation processes and dissociation strategies under in-situ conditions. In the latest hydrate formation experiments, key parameters have been applied to mimic the local marine environment of the Mallik site, Canada....

Sediment production under semi-arid climatic conditions using heavy mineral and petrographical data – a case study from the recent Kunene river system, northern Namibia

Jonas Kraus, Ali Abbas Wajid, Laura Stutenbecker & Matthias Hinderer
Provenance techniques are widely applied in resolving the origin of ancient sediment successions. Petrographic signatures, however, are controlled by a complex interplay of rock type, weathering mode as well as sediment transport, thus making the interpretation of data often ambiguous. One way to improve our understanding on these mechanisms is to study modern drainage systems. We selected the Kunene River in northern Namibia as a case study. This river system is well suited for such...

Modelling the deposition of the phosphorite layers in Malta and reconstruction of the fauna

Lars Tischer, Emilia Jarochowska, Or Bialik, Fabian Jakob, Ray Zammit, Matthias López Correa & Christian Schulbert
There are several phosphorite layers within the sedimentary succession of the Maltese Islands. These are related to climatic and ocean circulation pattern changes in the Mediterranean through the late Cenozoic. To decipher the depositional environment and processes related to the emplacement of these layers, several samples were collected from Il-Blata tal-Melh, southern Malta. With the help of CT-scans of these samples, the organisms and clasts within the phosphorites could be reconstructed by segmentation. This enabled...

Sediment flux quantification across the Permian – Triassic boundary of the SE Germanic Basin: implications for climate recovery and sediment routing system analysis

Domenico C. G. Ravidà, Luca Caracciolo, William A. Heins & Harald Stollhofen
Developing numerical approaches for predicting sediment flux variations is of primary importance for understanding the evolution of ancient sediment routing systems (SRS) and quantifying the role of external forcing controls. However, it is a particularly challenging task often hampered by the lack of solid paleo-climatic, paleo-tectonic and sedimentological constraints. Mass balance-based techniques, the most used in deep-time (>107 yr), suffer the intrinsic uncertainty of the stratigraphic record, determined by the impossibility to quantify hiatuses, unconformities...

Insights from surface analogues of the Odenwald into the structural architecture of crystalline units in the Northern Upper Rhine Graben

Claire Bossennec , Matthis Frey , Lukas Seib , Jeroen van der Vaart , Kristian Bär & Ingo Sass
The Upper Rhine Graben (URG) is a target area for deep geothermal and heat storage projects, as petrophysical and hydraulic properties of the faulted crystalline basement rocks, and the temperature field comprise a high geothermal potential (Soultz-sous-Forêts, Landau, Insheim, Rittershoffen). However, there is a lack of knowledge on the multi-scale structural architecture of such rock units in fault zones. Therefore, a multi-scale structural analysis is performed on surface analogues to improve the conceptual crystalline reservoir...

Determinants of ground source heat pump systems’ market acceptance: Empirical findings from Greece

Spyridon Karytsas
The residential sector consumes a significant amount of energy globally, with the majority being produced through the use of fossil fuels. Residential microgeneration technologies, such as photovoltaic systems and micro wind turbines for electricity production, and solar thermal systems, biomass boilers, and heat pumps for thermal needs, offer an alternative for reducing fossil fuel consumption. In this respect, the present study aims to examine the determinants of market acceptance of residential ground source heat pump...

A Heat Demand Map of North-West Europe - its impact on supply areas and identification of potential production areas for deep geothermal energy

Eileen Herbst , Elias Khashfe , Alexander Jüstel , Frank Strozyk & Peter Kukla
To achieve the Paris Agreement's goal of maximum global warming by 2 degrees, CO2 reduction is indispensable. Space heating for residential, service and industrial buildings amounts to 26% of EU's final energy consumption with about 3347 TWh/a. Approximately 75% of the heat produced is generated by fossil fuels with high CO2 emissions. Those Emissions can be reduced by implementation of renewable energy sources, such as deep geothermal energy. As Part of the Interreg NWE project...

First results of the full scale HT-ATES project in a greenhouse area Middenmeer in the Netherlands

Bas Godschalk & Peter Oerlemans
Agriport A7 is a large-scale greenhouse area in Middenmeer in the Netherlands. The local energy company ECW provides geothermal heat (92ºC, from 2 km depth) to the greenhouses through a heating network. The geothermal systems have significant overcapacity in the summer period while in winter they can provide only ~25% of the heat demand, resulting in a strong dependence on fossil fuels. ECW has built a full-scale High Temperature Aquifer Thermal Energy Storage (HT-ATES) system,...

Pore-scale modeling of acid etching in a carbonate fracture

Renchao Lu , Xing-yuan Miao , Olaf Kolditz & Haibing Shao
Acid fracturing technique has been widely used in the oil and gas industry for improving the carbonate reservoir permeability. In recent years this chemical stimulation technique is borrowed from the oil and gas industry, employed in the enhanced geothermal systems at Groß Schönebeck, Germany (Zimmermann et al., 2010), and at Soultz-sous-Forêts, France (Portier et. al., 2009). In principle, acid fracturing technique utilizes strong acids that react with acid-soluble rock matrix to non-uniformly etch the fracture...

Energy analysis of microseismicity induced byfluid-injection in the Soultz-sous-Forˆets geothermalreservoir

Kamel Drif , Olivier Lengliné , Jannes Kinscher & Jean Schmittbuhl
Between 1993 and 2005, the Soultz-sous-Forˆets reservoir was stimulated through 4 different wells crossing the reservoir at two different levels R3 (about 3km deep) and R5 (about 5km deep). The figure below represents the N-S section of the reservoir with the geometry of the 4 wells. During these stimulation episodes, seismic and hydraulic data were recorded. Using hydraulic data (pressure and flow rate) and available seismic catalogs of the stimulation episodes in the Soultz-sous-Forˆets reservoir,...

Combined architectural-element and microfacies analyses in carbonate sedimentology: the intra-basin shoal complex of the Lower Muschelkalk (Rüdersdorf Formation, Anisian)

Fabian Käsbohrer & Matthias Franz
The layer-cake strata of the epeiric Anisian-Ladinian Muschelkalk are devoid of large-scale architectural elements, e. g. steep clinoforms of a progradional platform slope. This resulted in a simplified approach in facies analysis, in which results of classical microfacies analysis (microscale) are used directly to conclude on depositional models (macroscale). In coastal settings, depositional cycles (mesoscale) are often defined in an intermediate step to visualize progradational or retrogradational patterns of shorelines or shoreline-detached shoals. Apart from...

UN Framework Classification - a tool for Sustainable Resource Management

Zoltán Horváth (1), Daniel de Oliveira (2), Kari Aslaksen Aasly (3), Mark Simoni (3), Lisbeth Flindt Jørgensen (4), David Whitehead (4), Antje Wittenberg (5), Ulrich Kral (6), Charlotte Griffiths (7), Harikrishnan Tulsidas (7) & Slavko Solar (8)
Mining and Geological Suvey of Hungary (MBFSZ), Budapest, Hungary (1); National Laboratory for Energy and Geology (LNEG), Amadora, Portugal (2); The Geological Survey of Norway, Trondheim, Norway (3); Geological Survey of Denmark and Greenland (GEUS), Copenhagen K, Denmark (4); Federal Institute for Geosciences and Natural Resources, BGR, Hannover, Germany (5); Technische Universität Wien, Faculty of Civil Engineering Research Center for Waste and Resource Management, Vienna, Austria (6); United Nations Economic Commission for Europe, Geneva, Switzerland...

Understanding morphological variation of the elbow joint in the Ursidae: Insights from 3D Geometric Morphometrics

Samuel, Joseph Leeming , John Nyakatura & Anneke, H. Heteren
Universitat Graz, Austria (1); Sektion Mammalogie, Zoologische Staatssammlung München, Staatliche Naturwissenschaftliche Sammlungen Bayerns, Munich, Germany (2); Institut für Biologie, Humboldt Universität zu Berlin, Berlin, Germany (3); GeoBio-Center, Ludwig-Maximilians-Universität München, Munich, Germany (4); Department Biologie II, Ludwig-Maximilians-Universität München, Munich, Germany (5) Variation in the skeletal morphology within the Carnivora has long been demonstrated as a predictor of a species’ ecological habits. The elbow joint in particular is a clear indicator of predation strategy[1]. Members of the...

Assessing sediment accumulation at inundated anthropogenic marshland in the southern North Sea: Using turbidity measurements and particle tracking

Ingo Jürgen Hache , Sebastian Niehüser, Volker Karius, Arne Arns & Hilmar von Eynatten
University of Göttingen, Geoscience Center (GZG), Department of Sedimentology and Environmental Geology, Göttingen, Germany (1); University of Siegen, Research Institute for Water and Environment, Siegen, Germany (2); University of Rostock, Faculty of Agricultural and Environmental Sciences, Rostock, Germany (3)

New approaches to coastal protection measures become increasingly important to protect for or to mitigate sea level rise (SLR) worldwide. Measures that involve only the heightening of dykes or revetments are prone to disturb the...

Natural stone resources and sustainability

Tom Heldal & Jorge Carvalho
Geological Survey of Norway, Norway (NGU) (1); Laboratório Nacional de Energia e Geologia (LNEG), Portugal (2)

Natural stone is perhaps the most widely used building material in the history of human evolution, applied in a range of applications, from the most prestigious monuments of civilisations to humble shelters. Being a construction material of high quality produced be simply shaping rocks to more or less advanced elements, it is relevant to ask if this magnificent...

Resolving Meter-Scale Interwell Depositional Heterogeneities for Improved 3D Reservoir Modelling - High Resolution 3D Photogrammetry and Geophysical Outcrop Surveys of Late-Jurassic Reservoir Rocks, Saudi Arabia

Ahmad Ihsan Ramdani , Pankaj Khanna, Gaurav Gariola , Sherif Hanafy & Volker Vahrenkamp
King Abdullah University of Science and Technology, Saudi Arabia (1); King Fahd University of Petroleum and Minerals, Saudi Arabia (2)

Interwell meter-scale depositional heterogeneity is a key geologic factor behind un-even fluid advance in carbonate reservoirs undergoing waterflooding and enhanced oil recovery developments. Subsurface data (seismic and well data) are limited in both resolution and data density to resolve this level of heterogeneity. Outcrop analogues are commonly utilized to fill this data gap on...

Modelling 2 Phase Flow in Heterogeneous and Anisotropic Rocks using AFRMs

Paul William, John Glover, Piroska Lorinczi & Saddam Sinan
University of Leeds, United Kingdom

Geological modelling and flow simulation in the subsurface in heterogeneous and anisotropic media is increasingly common. Unfortunately, conventional modelling using statistical techniques, up-scaling and interpolation to populate the inter-well volume of sparse datasets have a low resolution (> 50 m). Consequently they have difficulty modelling heterogeneous and anisotropic reservoirs. This paper focusses on modelling and simulation of heterogeneous and anisotropic reservoirs using a fractal approach (Advanced Fractal Reservoir...

Monitoring land subsidence and determining its relationship with groundwater abstraction using PS-InSAR method, Case study of Rafsanjan plain, Iran

Ali Mehrabi & Reza Derakhshani
Shahid Bahonar University of Kerman, Islamic Republic of Iran (1);Utrecht University, The Netherlands (2) ;

The issue of subsidence is one of the serious problems in the plains of Iran. Rafsanjan plain is also prone to this danger due to the high level of groundwater abstraction. In this study, an attempt has been made to study the extent and process of subsidence expansion over a period of time. For this purpose, ASAR and SENTINEL 1...

Quartz ballen structures and related cristobalite in impact breccias from the Ries crater, Germany, formed from dehydration of impact-generated diaplectic silicaglass

Fabian Dellefant, Claudia A. Trepmann , Melanie Kaliwoda , Kai-Uwe Hess, Wolfgang W. Schmahl & Stefan Hölzl
Department of Earth and Environmental Sciences, LMU, München, Germany (1); Mineralogische Staatssammlung, SNSB, München, Germany (2); RiesKraterMuseum Nördlingen, Nördlingen, Germany (3)

“Ballen structures” of quartz and cristobalite aggregates have been observed in impactites from a number of terrestrial impact structures, predominantly from impact melt rocks, suevites, and target rock clasts affected by high post-shock temperatures (e.g., CARSTENS, 1975; FERRIÈRE et al., 2010). The aggregates range from few hundreds of microns to 5mm in size...

Basaltic Dykes and xenoliths from the Kiama-Gerroa Region, New South Wales, Australia

Samar Usamah Abu Shamma , Ian Graham , Paul Lennox & Glen Bann
PANGEA Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales Sydney, Sydney, Australia (1); School of Earth, Atmosphere and Life Sciences, University of Wollongong, Wollongong, Australia (2)

Multiple dykes situated along the southeastern Australian coastline from south of Kiama to Gerroa were examined in detail. The results of geochemical analysis indicate the dyke’s composition varies from sub-alkaline to alkaline. The dykes fall under four separate geochemical groups, with...

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