Structure and density configuration of Germany’s subsurface: 3-D-Deutschland, an updated three-dimensional lithospheric-scale modelDenis Anikiev , Judith Bott , Mauro Cacace , Hans-Jürgen Götze & Magdalena Scheck-Wenderoth
With this study we revise and improve the three-dimensional lithospheric-scale structural and density model of Germany (3-D-D). Major shortcomings of this model resulted from joining three regional 3-D models that were poorly covered by data at their margins. Merging into a larger model revealed structural inconsistencies in these “marginal” domains. In order to resolve discrepancies between the units in a more consistent way we integrate newly available data from seismic reprocessing, tomography, and use 3-D...
Numerical simulations of the governing geophysical processes are crucial for geothermal applications in order to characterize the subsurface. This characterization presents us with major challenges ranging from the correct physical and geometrical characterization to the quantification of uncertainties. Quantifying rock physics uncertainties and performing other probabilistic inverse methods is, even with current state-of-the-art finite element solver and high-performance infrastructures, computationally not feasible for complex basin- and reservoir-scale geothermal applications due to the large spatial, temporal,...
Hydro-mechanical (HM) simulations are essential aspects of geothermal reservoir studies to assess the heat production and the associated-environmental impacts, such as seismicity. HM simulations are numerically expensive (especially for large-scale simulations) since they require a relatively fine mesh to capture the complex interplay between the fluid-flow and geomechanical processes. This aspect makes it difficult to perform detailed studies on uncertainties in HM simulations. In this work, we present a comprehensive review and numerical demonstrations about...
Closely-spaced carbonate replacement veins: the influence of external stress on focused fluid flow during carbonation of peridotiteManuel D. Menzel , Janos L. Urai & Estibalitz Ukar
The reaction of serpentinized peridotites with CO2-bearing fluids to listvenite (quartz-carbonate rocks) requires massive fluid flux and maintained permeability despite volume increase. Here we investigate listvenites and serpentinites samples from Hole BT1B of the Oman Drilling Project to improve our understanding of the mechanisms and feedbacks of fracturing and vein formation during peridotite carbonation. The samples are characterized by a high abundance of magnesite veins which are often bundled into closely-spaced, parallel sets. Relative cross-cutting...
Experimental investigation of hydrogen storage and transport properties in reservoir rocks under the influence of abiotic chemical reactions, microbial metabolism, and \"in-situ\" pressures.Nicolai Thüns, Garri Gaus , Ralf Littke & Helge Stanjek
RWTH Aachen, Clay and Interface Mineralogy(1);RWTH Aachen, Institute for Geology and Geochemistry of Petroleum and Coal(2);Temporary underground storage of molecular hydrogen (H2) in depleted oil and gas reservoirs has recently attracted increasing research interest as it can support chemical industry demands and peak-shaving in the energy supply grid. Experimental parameters related to abiotic chemical reactions, microbial metabolism, and transport mechanisms of molecular hydrogen under elevated pressure conditions in such reservoirs are of potential relevance to...
Influence of Quaternary glaciations on subsurface temperatures and pressures in NE onshore NetherlandsSebastian Amberg , Victoria Sachse , Stefan Back & Ralf Littke
Several glacial ice advances shaped the present-day morphology of central Europe during the Quaternary. Two Pleistocene glaciations, the Elsterian and the Saalian stages, advanced as far as the north-eastern part of the onshore Netherlands. Remains of these glacial advances and retreats are deep erosional glacial valleys of the Elsterian glaciation and till sheets, glacio-tectonic ridges and glacial basins assigned to the Saalian complex. In this study, we present the effects of sequential loading and unloading...
Geothermal Reservoir Characterisation and Probability Analysis of Fractured Media at Grimsel Test Site, SwitzerlandSelvican Türkdogan & Peter Achtziger
Exploitation of deep geothermal energy is considered as one of the most efficient renewable energy applications. In this sense, reservoir stimulation is established to extract geothermal energy from EGS (Enhanced Geothermal System) which is highly dependent on its in-situ structural properties: damage/shear zones, faults, fractures, its statistics and characteristics. In more detail, damage zones may behave like a conduit providing preferential pathways for fluid flow in otherwise impermeable rock such as granite or gneiss. To...
Contrasting intensity of aragonite dissolution in glacial vs. interglacial intervals of a sea-level controlled subtropical carbonate successionLars Reuning , Hanaa Deik , Benjamin Petrick , Hideko Takayanagi , Yasufumi Iryu , Margot Courtillat & Maria-Angela Bassetti
Aragonite and high-Mg calcite are abundant in modern, neritic temperate water systems but are nearly absent from their fossil counterparts. Dissolution of these metastable mineral phases will often leave no visible trace in the sedimentary record. Furthermore, it has been proposed that dolomitization is driven by reflux of mesohaline, aragonite undersaturated waters and that dolomite crystal growth is tightly coupled to aragonite dissolution in a temperate carbonate slope system. This study aims to clarify the...
Crustal structure and margin configuration of the La Baja Guajira basin, Colombia: regional 2D seismic reflection interpretation, gravimetric and thermal modellingLeidy Castro-Vera , Ralf Littke , Stefan Back & Rocío Bernal-Olaya
The La Baja Guajira Basin (LBGB) is the primary gas-producing region of Colombia and represents South America's northernmost prolongation. This study presents an analysis of regional 2D-seismic reflection data of LBGB integrated with borehole and gravity information. The deepest basement in the study area occurs in the northwestern offshore. This depocenter is oriented NW-SE. In the basin, four fault groups occur: 1) NW-SE-striking basement normal faults; 2) strike-slip faults; 3) inverted normal faults, and 4)...
Geological models, as 3-D representations of subsurface structures, can be combined with gravity inversions to obtain geometric representations of geological objects with similar porperty distributions. These models are built on prior assumptions and imperfect information, and they often result from an integration of geological and geophysical data types with varying quality. These aspects result in uncertainties about the predicted subsurface structures and property distributions, which will affect the subsequent decision process. We discuss approaches to...
Marine Isotope Stage (MIS) 3 represents a critical interval for understading the response of terretrial environments to rapid climate change driven by orbital focring. As the primary constituent of loess and a major driver in global climate forcing, mineral dust serves as a proxy that allows for direct comparison of loess data with chronologically better resolved ice and lake records. Motivated by the recent emergence of high-resolution magnetic and sedimentological data on European loess-paleosol profiles,...
Hydrocarbon Migration and its Implications for Hydrocarbon Exploration and Charge Risk Assessment: Case Studies from the Persian Gulf, IranAlireza Baniasad & Ralf Littke
Historically, basin and petroleum system modeling has mainly focused on understanding the burial and thermal history of sedimentary rocks as well as related hydrocarbon generation from kerogen (sedimentary organic matter) in source rocks; much less studies treated hydrocarbon migration and accumulation in great detail, although it is of uttermost importance for petroleum exploration and production. New 2D and 3D basin models in different parts of the Persian Gulf indicate the variable complexity of hydrocarbon migration...
Open-source and open data: combining both worlds for optimised decision making in geological subsurface modelsFlorian Wellmann , Miguel de la Varga & Alexander Jüstel
Computational Geoscience and Reservoir Engineering (CGRE), RWTH Aachen University, Aachen, Germany(1);Terranigma Solutions GmbH, Aachen, Germany(2);Fraunhofer IEG, Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems, Am Hochschulcampus 1, 44801 Bochum, Germany(3);
A Heat Demand Map of North-West Europe - its impact on supply areas and identification of potential production areas for deep geothermal energyEileen 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...
Internal Architecture of a carbonate ramp exposed to high amplitude sea-level fluctuations: Evidence from the NW shelf of AustraliaMaximilian Hallenberger , Lars Reuning , Stefan Back , Stephen J. Gallagher , Hokuto Iwatani & Katja Lindhorst
The North West Shelf of Australia represents an extensive tropical carbonate ramp and forms an important template for the interpretation of similar systems found within the sedimentary record. Yet, little is known about the development of the distally steepened ramp during the mid-to-late Quaternary, a period during which NW-Australia was subject to high-frequency glacioeustatic changes in sea level and climate. This research presents core and seismic-reflection data from a mid to outer ramp transect at...
Bias evaluated structural and probabilistic subsurface modelling: a case study of the Münsterland Basin, NW GermanyMarius Pischke , Alexander Magnus Jüstel , Frank Strozyk, Peter Kukla & Florian Wellmann
The analysis of uncertainties in the description of the subsurface is an important aspect for resource exploration and material storage. Because of the complexity of the subsurface and an often inhomogeneous data situation, models exhibit several aspects of uncertainties. These may be caused by the interpolation of locally sparse data and must be considered when constraining a structural geological model. Further, these interpolations may be subject to errors caused by psychological biases, which need to...
RWTH Aachen University15
Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems3
Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences3
The University of Texas at Austin1
Industrial University of Santander1
University of Melbourne1
Eindhoven University of Technology1
University of Perpignan1