436 Works

Sustainability in energy storages - How modern geoscience concepts can improve underground storage monitoring

Benjamin Haske , Tobias Rudolph & Bodo Bernsdorf
Technische Hochschule Georg Agricola, Germany(1);Re-using of large-volume salt caverns for the intermediate storage of liquid and gaseous energy carriers is an indispensable step on the way to a sustainable energy economy. Continuous development of methods for monitoring these facilities is a crucial part of the social license to operate. In the research project "Monitoring system for the safety of cavern storage facilities using satellite and unmanned aerial system (UAS) data" (KaMonSys), safety solutions for critical...

Nephelinites from the Gregory Rift

Michael Marks, Michelle Siegel , Mika Henzler , Thomas Binder , Simon Braunger, Thomas Wenzel , Anatoly Zaitsev , Andrei Arzamastsev & Gregor Markl
Nephelinites are strongly SiO2-undersaturated volcanic rocks that are often associated with phonolites and carbonatites. In the Gregory Rift in East Africa several major nephelinitic-phonolitic volcanoes occur, with some of them being associated with carbonatitic rocks (e.g., Oldoinyo Lengai, Kerimas, Mosonik, Shombole, Meru), while others lack carbonatites (e.g, Sadiman, Essimingor, Burko). We characterize the magmatic evolution of the Burko volcano and compare our results with published data from spatially associated nephelinite-phonolite±carbonatite associations in the Gregory Rift...

Passive Subsurface Characterisation (PSC): Using the groundwater response to Earth tides and atmospheric pressure

Gabriel C. Rau & Philipp Blum
Characterising subsurface hydraulic and geomechanical properties is a prerequisite for Earth resource management. Traditional approaches such as hydraulic testing are costly and require specific infrastructure as well as expertise which limits general testing capabilities. Passive Subsurface Characterisation (PSC) uses the groundwater response to natural forces, such as Earth tides and atmospheric pressure changes, to determine state of confinement and estimate hydro-geomechanical properties of the subsurface in-situ. This approach only requires standard measurements of groundwater hydraulic...

Rare earth elements and yttrium in naturally grown duckweeds: a pathway into the food web

Anna-Lena Zocher , Franziska Klimpel , Dennis Kraemer & Michael Bau
Rare Earths and Yttrium (REY) have become pivotal constituents of many high-technology products and processes. Their widespread use has led to a growing release of (“anthropogenic”) REY into the environment and hence rising concerns about their (bio)geochemical and (eco)toxicological behaviour. Yet, information on REY transfer, fractionation and bioaccumulation and -magnification in the food web is still scant. Here, we present REY data for naturally grown duckweeds and ambient waters. Duckweeds are small, rapidly-growing macrophytes inhabiting...

Tetravalent uranium mobilization by complexation or oxidation and associated U isotope fractionation

Yvonne Roebbert , Chris Daniel Rosendahl , Ashley Brown , Axel Schippers , Rizlan Bernier-Latmani & Stefan Weyer
Uranium (U) isotopes are suggested to monitor the success of (bio)remediation relying on the reduction of soluble and mobile U(VI) to less soluble U(IV)1. However, the subsurface stability of U(IV), typically present as solid-phase non-crystalline U, may be affected by complexation or oxidation. Understanding these processes and their impact on U isotope fractionation is important to correctly interpret field U isotope signatures. We investigated U mobilization by complexation and oxidation and measured the associated U...

The carbonatites of South Morocco: Unusual occurrences and associated REE-Nb-Ta-Fe mineralization

Rachid Benaouda , Dennis Kraemer , Maria Sitnikova & Michael Bau
The Oulad Dlim massif in the southernmost part of Morocco hosts several carbonatite bodies of different ages. The older carbonatite (1.85 Ga) occurs in the eastern Oulad Dlim massif in the Gleibat Lafhouda area and consists of three juxtaposed magnesiocarbonatite outcrops. They are associated with glimmerite, hosted by Archean gneiss, and unusually intruded by massive IOA deposits. The latter contains up to several wt% REE related to numerous monazite-(Ce) inclusions within large apatite crystals. Columbite-(Fe)...

Mineral inclusions in detrital garnet – An excellent petrogenetic tool

Jan Schönig
Cold and deep subduction is a characteristic feature of modern-style plate tectonics (MSPT) and a prerequisite for the formation of low-temperature/high-pressure (LT/HP) and ultrahigh-pressure (UHP) rocks. Although having strong implications for processes like the movement of materials between surface and mantle, mantle convection, thermal regimes, or the crustal growth rate, the onset of MSPT is poorly understood and controversially debated. One argument for an early onset are local occurrences of Paleoproterozoic retrogressed rocks suggested to...

Imaging the warm lithospheric mantle in the Mediterranean-Alpine region: integrated thermochemical inversion of surface wave dispersion, heat flow and elevation data.

Carlos Clemente , Javier Fullea , Amr El-Sharkawy , Thomas Meier , Sergei Lebedev & Thor Hansteen
Here we investigate the thermal structure of the lithosphere in the Alpine-Mediterranean region. We focus on areas characterized by negative velocity anomalies according to a lithosphere-upper mantle surface-wave tomography study (El-Sharkawy et al., 2020) to analyze possible lithospheric thinning and melting. Surface-wave, phase-velocity curves were determined by interstation cross-correlation measurements and inverted for a set of phase-velocity maps, spanning a broad period range. We invert fundamental mode Rayleigh and Love dispersion curves together with surface...

Ecotoxicological effects of rare earth elements on early life stages of fish

Stefania Piarulli , Bjørn Henrik Hansen , Frida Fossum , Florence Kermen , Bjarne Kvæstad , Pål A. Olsvik & Julia Farkas
Rare earth elements, comprising the 15 lanthanoids (LN; IIIb in the Periodic Table) plus yttrium are critical elements for a wide range of applications, including new and traditional industries as renewable energy, automotive industries, metallurgy as well as agriculture and medical diagnostics. Rising REY production and use can lead to an increased release into the environment and represents a potential environmental concern. However, the bioavailability and effects of REY and anthropogenic REY-chemical complexes (ACC-REY) remain...

Deposition of Subglacial Lake Sediments underneath the Laurentide Ice Sheet? – Sediment Cores from Lake Melville, Canada, provide first Evidence

Sophie Kowalski, Christian Ohlendorf, Jens Matthiessen & Andrea Catalina Gebhardt
Lake Melville is a fjord-type lake located in Labrador, Eastern Canada, as part of the Hamilton Inlet System. It is significantly characterised by its eastern connection to the Labrador Sea through a shallow sill at the entrance to the Rigolet Narrows. In contrast, the western part of the lake receives freshwater input from several major rivers. Previous studies assumed that Lake Melville was fully excavated by the Laurentide Ice Sheet (LIS) during the last glacial....

The value of heat interconnection pipelines in the use of deep geothermal energy

Markus Loewer , Maximilian Keim , Anahi Molar-Cruz & Christopher Schifflechner
Over the past fifteen years, Bavaria has become a hotspot for deep geothermal utilization in Europe. There are now 24 plants operating in the Molasse Basin that provide climate-friendly heat, electricity and cooling. For example, the state capital plans to cover its district heating supply in a climate-neutral manner and largely from deep geothermal energy by 2040. However, the use of deep geothermal energy is not limited to Munich. The demand for space heating and...

3D Basin modelling of the northern Upper Rhine Graben : insights on geothermal fluid pathways

Gillian Bethune , Adriana Lemgruber-Traby , Claire Bossennec , Kristian Bär , Jeroen van der Vaart , Christine Souque & Renaud Divies
The area of the Upper Rhine Graben (URG) is known for its geothermal potential. However, the recent interest for lithium co-production from geothermal brines raises questions about the quantification and dynamics of fluid flow paths in the geothermal system at the basin scale. This study aims to better understand the impact of the fluid circulation on the temperature field evolution and on the fluid recharge by performing a 3D thermal basin modeling. The Buntsandstein group...

Large hydraulic diffusivity of a single fault

Qinglin Deng , Guido Blöcher , Jean Schmittbuhl & Mauro Cacace
We provided an approach to estimate hydraulic diffusivity of a single fault by solving the linear diffusion equation in a partly open rough fracture under drained conditions when applying small pressure drop fluctuations (10^-5 Pa) along the fault. In contrast to the traditional calculation for the fracture hydraulic diffusivity using parameters such as hydraulic aperture, fluid compressibility, fluid viscosity, we here directly used time-dependent pressure profile p(x, y, t) to match the analytical solution for...

Gravity survey in delineating geologic features of interest for deep geothermal use at Campus North of KIT.

Maximiliano Pavez , Natalia Cornejo , Florian Bauer & Eva Schill
The seasonal mismatch of the thermal energy demand can be addressed by thermal energy storage systems of high capacity (e.g. Lee 2013). In this scenario, High-temperatures aquifer thermal energy storage systems (HT-ATES), which commonly supply domestic needs could expand to meet heating or industrial processes demands by storing excess heat. DeepStor is a planned scientific infrastructure that address the demonstration the concept of HT-ATES in former hydrocarbon reservoirs of deep sedimentary rocks. Specifically, the concept...

CDGP- a gateway to geothermal data in Alsace

Marc Schaming , Mathieu Turlure , Marc Grunberg & Jean Schmittbuhl
The CDGP [https://cdgp.u-strasbg.fr], Data Center for Deep Geothermal Energy, was created in 2016 by the LabEx G-Eau-Thermie Profonde (continuing now in ITI GeoT) [https://geot.unistra.fr/], to archive the high-quality data collected in the Upper Rhine Graben geothermal sites and to distribute them to the scientific community for R activities, taking Intellectual Property Rights into account. It manages seismological (catalogues, waveforms, focal mechanisms), seismic, hydraulic, geological, and other data related to anthropogenic hazard from different phases of...

Geothermal potential and opportunities in Vietnam

Viet Cao
Located between the Pacific Ring of Fire and Alpide Belt, Vietnam possesses significant potential geothermal resources, with more than 300 hot spring sites with temperatures from 40oC to 100oC have been detected in the territory. Based on available data, Vietnam is estimated to have a geothermal potential of up to 400 MW power generation. A pilot 25MW power plant was constructed in 2013 in Đakrông - Quảng Tri Province, central of Vietnam. From geothermal measurements...

Parametric optimization and comparative study of an organic Rankine cycle power plant for two-phase geothermal sources

Chaofan Chen , Francesco Witte , Ilja Tuschy , Olaf Kolditz & Haibing Shao
For two-phase geothermal resource, Organic Rankine Cycle (ORC) based binary plant is often applied for power production. In this work, a network topology was built with the Thermal Engineering Systems in Python (TESPy) software to simulate the stationary operation of the ORC plant. With this topology, the performance of nine different working fluids are compared. From the thermodynamic perspective, the gross and net power output is optimized respectively. Results show that R600 has the highest...

Transition from hydrocarbon production to geothermal heat storage in the Upper Rhine Graben – the DeepStor project

Eva Schill , Jens Grimmer , Katharina Schätzler , Kai Stricker , Judith Bremer & Thomas Kohl
The subsurface conditions of the Upper Rhine Graben are favorable for the development of novel geothermal utilization concepts. In particular, they allow optimization of energy use with flexible heat production and storage scenarios. A first potential analysis revealed an enormous storage potential of formerly used and well-explored oil fields. The involvement of former hydrocarbon reservoirs as components of geothermal concepts perfectly symbolizes the transition from the fossil-fuel age to the use of carbon-neutral renewable energies....

Levelized costs and economic impacts of geothermal district heating networks: a decision tree analysis

Astu Sam Pratiwi & Evelina Trutnevyte
Geothermal district heating networks are among the key options to decarbonize the heating sector in the State of Geneva in Switzerland. But the development of geothermal district heating requires high capital costs and involves risk of not finding sufficient geothermal resources, which make these systems less competitive. On the other hand, building geothermal district heating creates a wider impact on the economy, domestically and overall. But such impact has rarely been evaluated. Our study aims...

Simulation of flow through a single fracture calibrated with air permeameter measurements

Marco Fuchs , Sina Hale , Gabriel C. Rau , Kathrin Menberg & Philipp Blum
Determining fluid flow through natural fractures is an important task in many geoscience-related fields, such as geothermics. In order to estimate crucial parameters of single fractures controlling the flow and flow distribution, for example hydraulic apertures, hydro-mechanical numerical models have been established in recent years in addition to experimental methods. Although models enable a greater variety of analyses, they still require time-consuming processing before and after the simulation. This study presents a novel workflow for...

Seismic Monitoring of DeepStor: Using low-cost sensors for ambient noise correlation methods and Citizen Science

Johannes Käufl , Eva Schill & Thomas Kohl
DeepStor is an experimental facility with the goal to investigate High Temperature Aquifer Thermal Energy Storage (HT-ATES) systems at KIT Campus North. The operational seismic monitoring of DeepStor includes a network of five broadband and one borehole seismometer. In addition, we plan to install a scientific monitoring network with low-cost seismometers (such as the Raspberry Shake and the Quakesaver Hidra) to test innovative monitoring methods and for a Citizen Science project. Ambient noise tomography and...

Feasibility Study of Monitoring Delft Geothermal Project Using Land Controlled-Source Electromagnetic Method

Mahmoud Eltayieb , Dieter Werthmüller , Guy Drijkoningen & Evert Slob
Delft geothermal project (DAPwell) is a planned geothermal well doublet, where relatively cold water is going to be injected through one well into a low enthalpy geothermal reservoir to produce hot water from the other well. The volume of the cold water around the injection well will increase over time and, in the end, result in a thermal breakthrough. Thus, it is essential to trace the time-lapse change in the volume of the cold water...

Design and application of messenger nanoparticle tracers for multi-parameter reservoir exploration

Laura Spitzmüller , Jonathan Berson , Bastian Rudolph , Fabian Nitschke , Thomas Schimmel & Thomas Kohl
The inaccessibility of geothermal reservoirs makes the accurate determination and monitoring of reservoir properties and conditions difficult and is a major problem in reservoir engineering. We present an approach for the development of messenger nanoparticle tracers for the simultaneous determination of flow paths ("tracer") and reservoir properties ("messenger"), with a proof-of-concept example of flow-through experiments and temperature detection under controlled laboratory conditions. For this, silica particles are synthesized with a two-layer architecture, an inner closed...

Source of metals in ultramafic-hosted VMS deposits: insight from the Troodos ophiolite and ODP Hole 735B

Clifford Patten , Malte Junge & Alexandre Peillod
Volcanogenic massive sulfide (VMS) deposits associated with mafic-ultramafic rocks show strong structural control and are located at or in the vicinity of low angle detachment faults such as oceanic core complexes (OCC) in mid-ocean ridge environments. These ultramafic VMS deposits are variably enriched in precious (Au-Ag) critical (Co) and the base metals Cu, Zn, and Ni but the source of the metals remains poorly known. The Troodos ophiolite, Cyprus, and the ODP Hole 735B on...

Systematic analysis of precision, long-term stability and data processing of MC-ICP-MS 230Th/U-dating of secondary carbonates

Inga Kristina Kerber , Fabian Kontor , Jennifer Arps , René Eichstädter , Sophie Warken & Norbert Frank
MC-ICP-MS has become the clearly dominant technology in 230Th/U-dating over the last 20 years. The ongoing increase in measurement performance allows for ε-precision by now (Andersen et al., 2004; Cheng et al., 2013) and enabled the production of a large amount of datasets and insights covering a broad range of fields. Despite this large database, systematic studies on the impact of individual corrections on the raw data, long-term instrumental stability and on data processing routines...

Registration Year

  • 2022

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  • Karlsruhe Institute of Technology
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
  • Federal Institute for Geosciences and Natural Resources
  • Technical University of Darmstadt
  • University of Bremen
  • Leibniz University Hannover
  • University of Tübingen
  • RWTH Aachen University
  • University of Göttingen
  • Technische Hochschule Georg Agricola