459 Works

Inversion of Borehole Temperature Data Using Surrogate Model

Jia Wang , Fabian Nitschke , Emmanuel Gaucher & Thomas Kohl
The undisturbed or static formation temperature (SFT) is a key objective of the borehole measurements analysis. Conventional methods to estimate SFT require borehole temperature data measured during thermal recovery periods. As such, shut-in conditions should prevail for temperature logging, which can be both economically and technically prohibitive in actual operational conditions, especially for high-temperature boreholes. This study investigates the use of temperature logs obtained under injection conditions for SFT determination by applying a Bayesian inference...

Assessment of High Temperature Aquifer Storage Potential in Depleted Oil-Reservoirs from the South German Molasse Basin

Ulrich Steiner , Florian Bauer , Katharina Schätzler , Kai Robin Stricker & Eva Schill
In the discussion about the future role of geothermal in the energy transition policy, the topic of underground heat storage became recently more and more prominent. High Temperature Aquifer Storage (HTAS) may make geothermal more efficient by extending it beyond its traditional usage as a base load with also covering middle and even peak load. Depleted oil reservoirs can provide this underground storage capacity and Stricker et. al (2021) have numerically described the thermal storage...

3D geological modeling of graben structures in northern Hesse – concept, methods and first results

Ina Lewin, Rouwen Lehné & Heiner Heggemann
For some years now, the Hessian Agency for Nature Conservation, Environment and Geology (HLNUG) is focusing its 3D-modeling activities on urban areas, aiming to contribute to both integrated modeling and urban planning (e.g., Lehné et al. 2017, Lehné et al. 2013, Budde et al. 2017). Experiences gained in the frame of the project “Darmstadt_3D”, which is delivering the urban subsurface including the technical infrastructure (sewage system, foundations, etc.), now are adopted for a working area...

Authority, Identity and Ethics of Data Re-publication and Duplication

Lesley Wyborn , Kirsten Elger , Jens Klump , Kerstin Lehnert & Mingfang Wu
Today, research data is widely available in digital form, datasets are easily accessible online and the dataset creator should consider it advantageous as this leads to greater uptake. However, the downside is that digital datasets can be easily copied, duplicated in multiple places, and re-published through more than one repository or service. Particularly with web services, mirroring resources is a common practice, especially in online GIS packages and dashboards. ‘Copy WMS link’ buttons are common,...

Using mineral magnetics to track migration in the Bittern and Pict Fields, Central North Sea

Maryam Ahmed Abdulkarim , Adrian Muxworthy , Alastair Fraser & Martin Neumaier
;Minerals magnetics has been proposed as a means of improving our understanding of petroleum systems. We have carried out extensive rock magnetic experiments on core samples from the Tertiary reservoir sands of the Bittern and Pict Field, UK Central North Sea. This together with Petroleum Systems Modelling/Analysis has revealed the potential to characterise hydrocarbon migration pathway and fill-pattern through siderite identification. We have also suggested a plausible mechanism responsible for these observations. Furthermore, the presence...

Unexpected high amounts of H2 produced during serpentinization at magma-poor rifted margins

Elmar Albers , Wolfgang Bach , Marta Pérez-Gussinyé , Catherine McCammon & Thomas Frederichs
At magma-poor rifted margins, serpentinization of lherzolitic mantle rocks releases molecular hydrogen (H2) that supports chemosynthesis-based deep life. Until now, however, H2 fluxes in these systems remain largely unquantified. To help closing this knowledge gap we investigated serpentinization and H2 production using drill core samples from the West Iberia margin (Ocean Drilling Program Leg 103, Hole 637A). The mostly lherzolitic samples are strongly serpentinized, consist of serpentine with little magnetite, and are generally brucite-free. Serpentine...

A new universal model explaining fracture-trace length distributions

Michael Krumbholz , Christoph Hieronymus & Jochen Kamm
Fracture dimensions largely control rock properties like strength and permeability. Thus, knowing their statistical distributions is of great importance in many applied fields of the geosciences e.g., in geothermics, mineral exploration, and hydrology. They are also of academic interest since the statistical distribution of fracture dimensions (length, height, width) might provide inside in fracture formation mechanisms. However, in the vast majority of cases this information is derived from observations in 2 dimensions, i.e., instead of...

Identification of the diagenetic sedimentary environment and hydrothermal fluid fluxes in Southern Ocean sediments (IODP Exp 382) using B, Si and Sr isotopes in interstitial waters

Valentin Mollé , Sonja Geilert , Bridget Kenlee , Klaus Wallmann , Osamu Seki , Ji-Hwan Hwan , Michael E Weber , Maureen Raymo , Victoria L. Peck , Trevor Williams , Florian Scholz & Expedition 382 Scientists
During IODP Expedition 382, two sites were drilled at 53.2°S at the northern edge of the Scotia Sea and three sites at 57.4°–59.4°S in the southern Scotia Sea within the Atlantic sector of the Southern Ocean. Sediments at both locations alternate between dominant terrigenous components during glacials and dominant biogenic components, carbonate at the northerly sites and opal in the southern Scotia Sea, during interglacials. Here we constrain the geochemical environment in interstitial waters using...

Effect of cyclic loading at elevated temperatures on the magnetic susceptibility of a magnetite-bearing ore

Katarzyna Dudzisz , Mario Walter, Ralf Krumholtz , Boris Reznik & Agnes Kontny
Rocks are often subjected to dynamic stress that occurs during earthquakes, volcanic activity as well as human-induced activities. The aim of this study is to test if mechanical fatigue in rocks can be monitored by magnetic methods. For this purpose, the effect of cyclic-mechanical loading (150 + 30 MPa) on the magnetic susceptibility and its anisotropy of a magnetite-bearing ore with varying temperatures and environment was investigated. Our study shows that magnetic susceptibility decreases significantly...

Uncertainty and risk analysis in basin and stratigraphic modelling: the response surface approach

Samer Bou Daher & Alcide Thebault
Any attempt at modelling natural phenomena includes a number of numerical assumptions on which we have little or no constraints. Basin and forward stratigraphic modelling are methodologies that aim at reproducing the history of sedimentary basins and their internal complexities. As are all deterministic models, these models are characterized by the none-uniqueness of their results. Meaning very different models can equally honor the calibration data. The traditional approach to such a problematic is a Monte-Carlo...

Curating data and samples in the long-tail - tools and examples from GFZ Data Services

Kirsten Elger & Florian Ott
GFZ Data Services, an international research data repository for the Earth sciences domain and Allocating Agent for the IGSN Global Sample Number (IGSN), is operated under the umbrella of the GFZ German Research Centre for Geosciences. GFZ Data Services increases the discoverability and reusability of data through (1) the provision of comprehensive domain-specific data description via standardised and machine-readable metadata with controlled domain vocabularies; (2) complementing the metadata with comprehensive and standardised technical data descriptions...

Geochemical control of hydraulic and mechanical reservoir sandstone properties

Maria Wetzel , Thomas Kempka & Michael Kühn
University of Potsdam, Institute of Geosciences(2);Geochemical processes such as mineral dissolution and precipitation alter the microstructure of rocks, and thereby affect their hydraulic and mechanical behaviour. Quantifying and considering these property changes in reservoir simulations substantially supports risk assessments related to geological subsurface utilization. In our virtual laboratory, 3D pore-scale models of typical reservoir sandstones are applied to determine the effective hydraulic and elastic properties of sandstones. In order to adequately depict characteristic distributions of...

The impact of increasing temperature on microbial lipid distributions in the Nankai Trough subduction zone, IODP Exp. 370

Florence Schubotz , Inga Hölscher , Julius Sebastian Lipp , Yuki Morono , Fumio Inagaki , Verena B. Heuer & Kai-Uwe Hinrichs
Site C0023 in the Nankai Through subduction zone was established in 2016 to investigate the temperature limits of deep subsurface life. Here, we report on the detection of intact polar lipids and their degradation products in sediments recovered from this site where temperatures reach values close to the known limit of life of ca. 120°C at the bottom of the core at 1170 m. Lipid biomarkers characteristic for sedimentary methanogens and unclassified heterotrophic archaea were...

Open-source and open data: combining both worlds for optimised decision making in geological subsurface models

Florian 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);

Hipercorig Hallstatt History (H3): Accessign a deep time window of Lake Hallstatt´s preHistory

Michael Strasser, Flavio Anselmetti, Achim Brauer, Stefano Fabbri, Ulrich Harms & Kerstin Kowarik

A key option to transfer geosciences – relate geoheritage to fun

Marie-Luise Frey , Christine Hogefeld , Pascal Schmitz & Klaudia Wolf
Many attempts up to today exist to transfer geosciences to the general public. Some started at the beginning of the 20th century. It is surprising that only since the beginning of the 21st century with the formation of the European Geoparks Network in 2000 and the Global Geoparks Network in 2004, a new, consequent professional way of transfering geosciences was implemented. This includes information, education, geotourism, sustainable development of territories and at sites, e.g. Messel...

Preservation of the geological and industrial heritage of a post-mining landscape by the example of the glacial Muskau Arch

Kersten Löwen
The Muskau Arch in the border triangle of Brandenburg-Saxony-Poland is a push moraine that was folded up by the Muskau Glacier during the second Elster surge about 340,000 years ago. In the process, it folded the underlying strata to a depth of approx. 270–290m. It is considered one of the best examples worldwide of large-scale glaciotectonic deformation. As a result of the compression, lignite, glass sands and clays, were pushed to the surface, and a...

Combined Fluorescence Imaging and LA-ICP-MS Trace Element Mapping ofStalagmites: Microfabric identification and interpretation

Jakub Sliwinski & Heather Stoll
Here, we map a series of stalagmites from Asturias, Spain, by laser ablation inductively-coupled-plasma mass spectrometry and confocal laser scanning (fluorescence) microscopy and discuss the origins of trace element and fluorescence variations. Seasonal banding is evident with both methods and may be attributed to lignins/humic acids based on fluorescence absorption and emission characteristics. Some lateral variations in fluorescence present as saw-tooth “spires” and demonstrate disruptions of seasonal banding, corroborated by trace element variations (most prominently...

Analysis of surface displacements caused by mine flooding for the project FloodRisk with SAR Interferometry, GNSS and Levelling

Markus Even , Malte Westerhaus & Daniel Schröder
After operation of hard coal mines has been terminated in Germany, many of the mines are being flooded. In the project “FloodRisk: Earthquakes, uplift, and long-term liabilities – risk minimization during mine flooding”, the consequences of the rising mine water levels are investigated from a multidisciplinary perspective. Geodetic, geophysical, geomechanical and geological approaches are combined to develop a conceptional model for flooding induced surface displacements and seismicity. Saarland, Ruhr area and Ibbenbüren have been chosen...

Rock slope failures along the Forkastningsfjellet coastline, Svalbard: characteristics and implications for controlling and triggering factors.

Dirk Kuhn , Jewgenij Torizin , Michael Fuchs , Reginald Hermanns , Tim Redfield & Dirk Balzer
Climate warming and the related permafrost degradation are thought to influence slope stability, landscape evolution, and the natural hazard potential in polar- and high mountain regions. In this context, we investigate the coastal range of Forkastningsfjellet, Svalbard, which is affected by rock slope deformations of different magnitudes and age. Based on a detailed multidisciplinary investigation, we discuss the causes, kinematics and timing of rock slide activity. The distinct stair-stepped morphostructural relief of the Forkastningsfjellet ridge...

Development of a fluid treatment strategy to enable combined raw material and freshwater recovery from geothermal fluids

Valentin Goldberg , Daniel Winter , Fabian Nitschke , Diego Morata , Joachim Koschikowski & Thomas Kohl
The energy transition and the associated need for non-energy, mineral raw materials have prompted the German government to expand research and development activities along the entire value chain. It is well known that the highly mineralized thermal waters that circulate during the extraction of geothermal energy have, in some cases, significant enrichments of economically strategic elements such as lithium, rubidium, antimony or magnesium. The extraction of mineral resources from thermal waters is still challenging in...

Stromatolitic microorganisms in and on top of fluid-escape structures of the 3.2 Ga Moodies Group

Sebastian Reimann , Christoph Heubeck , Martin Homann , Deon Johannes Janse van Rensburg & Michael Wiedenbeck
The global record of early life is only poorly preserved, but has an ark in the 3.2 Ga Moodies Group of the Barberton Greenstone Belt, South Africa and Eswatini. It preserves silicified photosynthetic and sulfate-reducing metabolic signatures in sandstone-dominated, terrestrial to shallow-marine strata. Large fluid-escape structures are common in thick-bedded kerogen-laminated sandstones of (sub-)tidal facies. We document and interpret silicified, massive and laminated carbonate aggregates and beds, both of likely microbial origin, within and on...

Potential flach lagernder Salzformationen in Deutschland als Standort für ein Endlager für wärmeentwickelnde radioaktive Abfälle

Till Popp , Ralf Günther & Dirk Naumann
Seit 2013 hat in Deutschland die Standortsuche für ein Endlager für hochradioaktive Abfälle mit dem ersten Standortauswahlgesetzes (StandAG) neu begonnen. Viele Jahrzehnte lang wurde in Deutschland die Entwicklung von Endlagerkonzepten und Sicherheitsanalysen für ein Endlager in einem Salzstock priorisiert, während Endlagerkonzepte für Ton- und Kristallingestein erst seit zwei Jahrzehnten berücksichtigt werden. Zielstellung eines vergleichenden Standortauswahlverfahrens ist, bis 2031 einen Standort zu finden, der für 1 Million Jahre die bestmögliche Sicherheit für den Einschluss hochradioaktiver Abfälle...

Biologic agents mediating matter-flow inside the porous igneous oceanic crust, Vesteris Seamount, Greenland Sea

Hinrich Schmid-Beurmann, Magnus Ivarsson, Wolfgang Bach, Wolf-Achim Kahl & Jörn Peckmann
Microorganisms within the lithosphere are biologic agents settling in niches inside the terrestrial and oceanic crust, populating the extreme environments of the deep biosphere. The fossil record of the permeable igneous oceanic crust, constructed out of primitive extrusive rock, opens a window into Earth’s early evolution and serves as an analogue for life in extraterrestrial worlds. In 2019, samples of highly porous basanites of Vesteris Seamount in the Greenland Sea were retrieved during a cruise...

Radon Emanations from Soils: Case Study of Central Ukrainian Uranium Province

Valentyn Verkhovtsev , Tamara Viktorivna Dudar , Yurii Tyshchenko & Volodymyr Pokalyuk
Ukraine is known as a uranium mining country located in the Central-Eastern Europe. The authors have been studying radioecological situation within the Central Ukrainian Uranium Province where the uranium deposits are located (operated, dormant and perspective ones) for more than 10 years already. Radioecological research, including the radon emanations from soils, allowed us allocating radon-hazardous areas associated with uranium mineralization. The recently studied Mykhailivska ore area (south-eastern part of the Ukrainian Shield) is a unique...

Registration Year

  • 2022
    307
  • 2021
    149
  • 2020
    3

Resource Types

  • Text
    459

Affiliations

  • Karlsruhe Institute of Technology
    46
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
    34
  • Federal Institute for Geosciences and Natural Resources
    20
  • Technical University of Darmstadt
    13
  • University of Bremen
    12
  • RWTH Aachen University
    11
  • University of Tübingen
    9
  • Utrecht University
    9
  • Ludwig-Maximilians-Universität München
    8
  • GEOMAR Helmholtz Centre for Ocean Research Kiel
    7