Inst. Angewandte Geowissenschaften

144 Items

Recent Submissions
Cable reverberations during wireline distributed acoustic sensing measurements: their nature and methods for elimination

Martuganova, Evgeniia ; Stiller, Manfred ; Bauer, Klaus ; Henninges, Jan ; Krawczyk, Charlotte M. (2021-05-16)

The application of distributed acoustic sensing in borehole measurements allows for the use of fibre optic cables to measure strain. This is more efficient in terms of time and costs compared with the deploying of conventional borehole seismometers. Nevertheless, one known drawback for temporary deployment is represented by the freely hanging wireline cable slapping and ringing inside the casin...

Comparative Evaluation of Statistical and Fractal Approaches for JRC Calculation Based on a Large Dataset of Natural Rock Traces

Marsch, Kristofer ; Fernandez-Steeger, Tomas M. (2021-02-03)

After the publication of the type-profiles for the estimation of the joint roughness coefficient (JRC) a discussion evolved about how to adequately use these traces. Based on the chart numerous researchers assembled mathematical correlations with various parameters seeking objectivity in the determination of JRC. Within these works differences concerning the database and the mathematical implem...

Wireline distributed acoustic sensing allows 4.2 km deep vertical seismic profiling of the Rotliegend 150 °C geothermal reservoir in the North German Basin

Henninges, Jan ; Martuganova, Evgeniia ; Stiller, Manfred ; Norden, Ben ; Krawczyk, Charlotte M. (2021-02-25)

We performed so-far-unprecedented deep wireline vertical seismic profiling at the Groß Schönebeck site with the novel method of distributed acoustic sensing (DAS) to gain more detailed information on the structural setting and geometry of the geothermal reservoir, which is comprised of volcanic rocks and sediments of Lower Permian age. During the survey of 4 d only, we acquired data for 61 sour...

Local Earthquake Tomography at Los Humeros Geothermal Field (Mexico)

Toledo, Tania ; Gaucher, Emmanuel ; Jousset, Philippe ; Jentsch, Anna ; Haberland, Christian ; Maurer, Hansruedi ; Krawczyk, Charlotte ; Calò, Marco ; Figueroa, A. (2020-12-07)

A passive seismic experiment using 25 broadband and 20 short‐period stations was conducted between September 2017 and September 2018 at Los Humeros geothermal field, an important natural laboratory for superhot geothermal systems in Mexico. From the recorded local seismicity, we derive a minimum 1‐D velocity model and obtain 3‐D Vp and Vp/Vs structures of Los Humeros. We improved the classical ...

Supplemental Information and Data for uncertainty analysis and identification of key parameters controlling bacteria transport within a riverbank filtration scenario (submitted to Water Resources Research)

Knabe, Dustin ; Guadagnini, Alberto ; Riva, Monica ; Engelhardt, Irina (2020)

This dataset includes Supplemental Information and Data for research paper: Knabe, D., Guadagnini, A., Riva, M., Engelhardt, I.: Uncertainty analysis and identification of key parameters controlling bacteria transport within a riverbank filtration scenario (Water Resources Research).

Rock Surface Roughness Determination: Matlab scripts of evaluation algorithms and original scanned surfaces

Marsch, Kristofer (2020-02-01)

There exist many mathematical approaches for the determination of surface roughness in the context of rock engineering. Unfortunately, in most publications on that topic the evaluation algorithms are not fully disclosed. This makes it almost impossible to reproduce and verify prior findings. Even achieving an acceptable accordance is labour-intensive. Therefore, this data submission offers some...

Factors controlling the formation and occurrence of petroleum in Norwegian petroleum systems, as revealed by considerations of chemical and isotopic compositions

Murillo Hernandez, Wendy (2021)

Establishing genetic correlations between oils and between oils and their source rocks is especially difficult in basins with multiple source rocks where oil mixing has occurred. It is therefore of paramount importance to employ multiparameter approaches based on a combination of source-related molecular markers across different fractions of oils and source rock extracts in order to perform mea...

Microbial Signatures in Deep CO2-Saturated Miocene Sediments of the Active Hartoušov Mofette System (NW Czech Republic)

Liu, Qi ; Adler, Karsten ; Lipus, Daniel ; Kämpf, Horst ; Bussert, Robert ; Plessen, Birgit ; Schulz, Hans-Martin ; Krauze, Patryk ; Horn, Fabian ; Wagner, Dirk ; Mangelsdorf, Kai ; Alawi, Mashal (2020-12-14)

The Hartoušov mofette system is a natural CO2 degassing site in the central Cheb Basin (Eger Rift, Central Europe). In early 2016 a 108 m deep core was obtained from this system to investigate the impact of ascending mantle-derived CO2 on indigenous deep microbial communities and their surrounding life habitat. During drilling, a CO2 blow out occurred at a depth of 78.5 meter below surface (mbs...

Coherent diffraction imaging for enhanced fault and fracture network characterization

Schwarz, Benjamin ; Krawczyk, Charlotte M. (2020-10-22)

Faults and fractures represent unique features of the solid Earth and are especially pervasive in the shallow crust. Aside from directly relating to crustal dynamics and the systematic assessment of associated risk, fault and fracture networks enable the efficient migration of fluids and therefore have a direct impact on concrete topics relevant to society, including climate-change-mitigating m...

Structural Evolution at the Northeast North German Basin Margin: From Initial Triassic Salt Movement to Late Cretaceous‐Cenozoic Remobilization

Ahlrichs, Niklas ; Hübscher, Christian ; Noack, Vera ; Schnabel, Michael ; Damm, Volkmar ; Krawczyk, Charlotte M. (2020-07-14)

In this study, we investigate the regional tectonic impact on salt movement at the northeastern margin of the intracontinental North German Basin. We discuss the evolution of salt pillows in the Bay of Mecklenburg in the light of thick‐ and thin‐skinned tectonics, including gravity gliding, and differential loading using seismic imaging. Stratigraphic and structural interpretation of a 170 km l...

Effect of Soil Geomechanical Properties and Geo-Environmental Factors on Landslide Predisposition at Mount Oku, Cameroon

Djukem, Wamba Danny Love ; Braun, Anika ; Wouatong, Armand Sylvain Ludovic ; Guedjeo, Christian ; Dohmen, Katrin ; Wotchoko, Pierre ; Fernandez-Steeger, Tomas Manuel ; Havenith, Hans-Balder (2020-09-17)

In this work, we explored a novel approach to integrate both geo-environmental and soil geomechanical parameters in a landslide susceptibility model. A total of 179 shallow to deep landslides were identified using Google Earth images and field observations. Moreover, soil geomechanical properties of 11 representative soil samples were analyzed. The relationship between soil properties was evalu...

Wavelet transform‐based seismic facies classification and modelling: application to a geothermal target horizon in the NE German Basin

Bauer, Klaus ; Norden, Ben ; Ivanova, Alexandra ; Stiller, Manfred ; Krawczyk, Charlotte M. (2019-09-10)

At the geothermal test site near Groß Schönebeck (NE German Basin), a new 3D seismic reflection survey was conducted to study geothermal target layers at around 4 km depth and 150°C. We present a workflow for seismic facies classification and modelling which is applied to a prospective sandstone horizon within the Rotliegend formation. Signal attributes are calculated along the horizon using th...

Subsoil classification and geotechnical zonation for Guadalajara City, México: Vs30, soil fundamental periods, 3D structure and profiles

Ramírez Gaytan, Alejandro ; Flores Estrella, Hortencia ; Preciado, Adolfo ; Bandy, William L. ; Lazcano, Salvador ; Alcántara Nolasco, Leonardo ; Aguirre González, Jorge ; Korn, Michael (2020-01-25)

Guadalajara, Jalisco, is the second largest city in Mexico with around 4.5 million inhabitants. A high seismic hazard exists in the city due to forces produced by the interaction between the Rivera, Cocos and North American plates and the smaller Jalisco Block. Guadalajara is one of the largest cities built over pumice soil deposits. Furthermore, the near‐surface phreatic level causes a high su...

Opportunities and challenges for in situ, fermentation-based microbial enhanced oil recovery (MEOR) in a high-salinity oilfield

Kögler, Felix (2020)

Microbial Enhanced Oil Recovery (MEOR) represents a promising economic and sustainable EOR approache but is still scarcely employed due to its image as a “black-box” technology. Within the framework of this dissertation, opportunities for in situ MEOR in a low-temperature (37 °C) and high-salinity (180 g*L-1) oilfield by stimulating the growth of anaerobic fermentative bacteria of the order Hal...

Development of a fully coupled biogeochemical reactive transport model to simulate microbial oxidation of organic carbon and pyrite under nitrate‐reducing conditions

Knabe, Dustin ; Kludt, Christoph ; Jacques, Diederik ; Lichtner, Peter ; Engelhardt, Irina (2018-11-23)

In regions with intensive agriculture nitrate is one of the most relevant contaminants in groundwater. Denitrification reduces elevated nitrate concentrations in many aquifers, yet the denitrification potential is limited by the concentration of available electron donors. The aim of this work was to study the denitrification potential and its limitation in natural sediments. A column experiment...

Reservoir-scale transdimensional fracture network inversion

Somogyvári, Márk ; Kühn, Michael ; Reich, Sebastian (2019-11-08)

The Waiwera aquifer hosts a structurally complex geothermal groundwater system, where a localized thermal anomaly feeds the thermal reservoir. The temperature anomaly is formed by the mixing of waters from three different sources: fresh cold groundwater, cold seawater and warm geothermal water. The stratified reservoir rock has been tilted, folded, faulted, and fractured by tectonic movement, p...

Fault‐controlled lithospheric detachment of the volcanic southern South Atlantic rift

Becker, Katharina ; Tanner, David C. ; Franke, Dieter ; Krawczyk, Charlotte M. (2016-02-17)

We present structural models of two exemplary conjugate seismic lines of the southernmost South Atlantic margins to examine their initial evolution, especially the seaward‐dipping reflectors (SDRs). Modeling illustrates the different structure and inclination angles of the SDRs, which therefore require different subsidence histories. Since typical symmetrical subsidence models are not applicabl...

Products of Hexavalent Chromium Reduction by Green Rust Sodium Sulfate and Associated Reaction Mechanisms

Thomas, Andrew N. ; Eiche, Elisabeth ; Göttlicher, Jörg ; Steininger, Ralph ; Benning, Liane G. ; Freeman, Helen M. ; Dideriksen, Knud ; Neumann, Thomas (2018-10-29)

The efficacy of in vitro Cr(VI) reduction by green rust sulfate suggests that this mineral is potentially useful for remediation of Cr-contaminated groundwater. Previous investigations studied this reaction but did not sufficiently characterize the intermediates and end products at chromate (CrO42−) concentrations typical of contaminant plumes, hindering identification of the dominant reaction ...

Detection of Karst Features in the Black Hills Area in South Dakota/Wyoming, USA, Based on Evaluations of Remote Sensing Data

Theilen-Willige, Barbara (2018-05-28)

Landsat 8, Sentinel 2, Aster, RapidEye and PlanetScope data and Sentinel 1- and Advanced Land Observing Satellite (ALOS)-Phased Array type L-band Synthetic Aperture Radar (PALSAR)-radar images have been evaluated for a karst feature inventory in the Black Hills area in Wyoming/South Dakota, USA. The GeoInformation System (GIS) integrated evaluation of the different satellite data included as we...

Reassessing Hydrological Processes That Control Stable Isotope Tracers in Groundwater of the Atacama Desert (Northern Chile)

Scheihing, Konstantin W. ; Moya, Claudio E. ; Struck, Ulrich ; Lictevout, Elisabeth ; Tröger, Uwe (2017-12-26)

A collection of 514 stable isotope water samples from the Atacama Desert is being reassessed geostatistically. The evaluation reveals that adjacent Andean catchments can exhibit distinct δ18O and δ2H value ranges in meteoric waters, despite similar sample altitudes of up to 4000 m above sea level (a.s.l.). It is proposed that the individual topographic features of each catchment at the western ...