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In the Late Cretaceous to Cenozoic, multiple inversion events affected Central Europe's intracontinental sedimentary basins. We investigate the impact of these inversion events on Zechstein salt structures formed prior to inversion based on seismic data located in the Baltic sector of the North German Basin. The study area covers the eastern Glückstadt Graben and the Bays of Kiel and Mecklenburg. We link stratigraphic interpretation to previous studies and nearby wells and present key seismic depth sections and thickness maps at a new level of detail. Prestack depth migrated seismic profiles are part of the BalTec dataset acquired during cruise MSM52 in march 2016 in the Baltic Sea. The seismic equipment consisted of an eight GI‐Gun cluster (45/105 in³) allowing for deep signal penetration with a relatively wide frequency bandwidth with a dominant frequency of 80 Hz. The streamer had an active cable length of 2,700 m with a minimum offset of 33 m. Seismic processing included τ‐p domain prestack predictive deconvolution, surface‐related multiple attenuation (SRME) to attenuate multiples, frequency filtering, amplitude recovery, noise reduction, and prestack depth migration. The time migrated seismic profile was acquired during a student marine excursion of the University of Hamburg in 2019, cruise AL526. A Mini-GI gun (true GI-mode with 15 in³ generator and 30 in³ injector volume) and a 48 channel streamer with 4m group spacing was used. Seismic data processing was analog to the depth sections, except for migration. Here, a poststack kirchhoff time migration was applied. For mapping, we used all available lines in the study and created time-structure maps by minimum curvature spline interpolation with a grid cell size of 300x300 m. By subtracting the top and bottom horizons, we created isochron maps (vertical thickness in two-way time) for the Zechstein, Cenomanian-Turonian, Coniacian-Santonian, Campanian, Maastrichtian-Danian, upper Paleocene, Eocene-Miocene units. We converted the time-isochron maps to vertical thickness in meter by using constant velocities derived from averaging the results of the refraction travel-time tomography.
An extensive vertical seismic profiling (VSP) survey using wireline distributed acoustic sensing (DAS) technology was carried out between the 15th and 18th of February 2017 at the geothermal in-situ laboratory Groß Schönebeck, Germany. Borehole measurements were recorded in two 4.3 km deep wells E GrSk 3/90 and Gt GrSk 4/05. Two hybrid fibre optics cables were freely lowered inside the wells to form dense receiver arrays. As a seismic source, four heavy vibroseis trucks were used. The survey consisted of 61 source positions distributed in a spiral pattern around the target area. This data publication consists of raw uncorrelated seismic data acquired for 3D seismic imaging purposes. Supplementary information such as well trajectories, source point coordinates, and the pilot sweep data is also provided. Data related to zero-offset measurements can be found in Henninges et al. (2021, https://doi.org/10.5880/GFZ.4.8.2021.001). Further details on the survey design and data acquisition parameters can be found in Henninges et al. (2021, https://doi.org/10.5194/se-12-521-2021); Martuganova et al. (2021, 2022). Information on high-resolution 3D reflection seismic acquisition campaign carried out at Groß Schönebeck in February–March 2017 can be found in Krawczyk et al. (2019); Bauer et al. (2020); Norden et al. (2022). The 3D DAS VSP processing workflow, 3D DAS imaging results, and comparison with 3D surface seismics are presented in Martuganova et al. (2022).
In diesem Bericht wird die durch das GFZ Potsdam am 18. Juli 2024 durchgeführte bohrlochgeophysikalische Messung in der Bohrung Gt P 14a/23 in Potsdam (Brandenburg) dokumentiert. Die Messung wurde mit dem Ziel der Gewinnung hochaufgelöster und ungestörter Temperatur-Tiefen-Profile durchgeführt. Die Sidetrack-Bohrung der Hauptbohrung Gt P 14 wurde im März 2023 abgeteuft. Anschließend erfolgten Testarbeiten im Mai desselben Jahres. Bis zur Durchführung dieser Messungen erfolgten keine weiteren Aktivitäten in der Bohrung. Die Stillstandszeit (shut-in time) beträgt mind. 14 Monaten für die oberen 1.100 m, weshalb keine thermische Beeinflussung der Temperaturen durch den Bohrprozess mehr erwartet wird. In der Bohrung Gt P 14a/22 wurde bei 1039,9 m Teufe eine Temperatur von 46,07 °C gemessen, welches einem mittleren Temperaturgradienten von 35,6 °C/ km entspricht.
The dataset is the basis for describing a 60-year-long evolution of groundwater dynamics and thermal field in the North German Basin beneath the Federal State of Brandenburg (NE Germany), covering the period between 1953 and 2014 with monthly increments. It was produced by one-way coupling of a near-surface distributed hydrologic model to a 3D basin-scale thermohydraulic groundwater model with the goal of investigating feedbacks between climate-driven forcing (in terms of time- and space-varying recharge and temperature), basin-scale geology, and topographic gradients. Modeled pressure and temperature distributions are validated against published groundwater level and temperature time series from observation wells. Our results indicate the spatio-temporal extent of the groundwater system subjected to nonlinear interactions between local geological variability and climate conditions. The dataset comprises of input files and scripts required to run the groundwater model in GOLEM and output files from the transient thermo-hydraulic simulations in EXODUS format. The input and output data is organized as separate archived folders (*.gz format).
In diesem Bericht wird die durch das GFZ Potsdam am 9. September 2020 durchgeführte bohrlochgeophysikalische Messung in der Bohrungen Ug Wsbg 10/76 in Wesenberg (Mecklenburg-Vorpommern) dokumentiert. Die Messung wurde mit dem Ziel der Gewinnung eines hochaufgelösten und ungestörten Temperatur-Tiefen-Profils durchgeführt. Die Untergrundspeicherbohrung wurde 1976 am Salzstock Wesenberg abgeteuft und lange als Sole-Verpressbohrung genutzt. Die Stillstandszeit nach letzter Nutzung liegt bei mind. 44 Monaten, weshalb von hydraulisch ungestörten Gebirgstemperaturen ausgegangen wird. In der Bohrung Ug Wsbg 10/76 wurde bei 1784,3 m Teufe eine Temperatur von 72.70 °C ermittelt, welches einem mittleren Temperaturgradienten von 36,0 °C/ km entspricht.
In diesem Bericht werden die durch das GFZ Potsdam am 29. und 30. November 2023 durchgeführte bohrlochgeophysikalische Messungen in den Bohrungen Gt Khn 1/88 und Gt Khn 2/87 in Karlshagen (Mecklenburg-Vorpommern) dokumen-tiert. Die Messungen wurden mit dem Ziel der Gewinnung hochaufgelöster und un-gestörter Temperatur-Tiefen-Profile durchgeführt. Die Stillstandszeiten seit Erstel-lung liegen bei mehreren Jahrzehnten; jene seit letzter Befahrung bei fünfzehn Jahren, weshalb von ungestörten Gebirgstemperaturen ausgegangen werden kann. In der Bohrung Gt Khn 2/87 wurde bei 1786,5 m Teufe eine Temperatur von 57,8 °C, welches einem mittleren Temperaturgradienten von 27,8 °C/km entspricht, ge-messen. Die Bohrung Gt Khn 1/88 konnte bis zu einer Teufe von 325,1 m befahren werden, die gemessene Temperatur betrug 16,2 °C, der entsprechende mittlere ge-othermische Gradient beträgt ca. 23,6 °C/km. This report documents the borehole geophysical logging performed by GFZ Potsdam in the Gt Khn 1/88 and Gt Khn 2/87 boreholes in Karlshagen (Mecklenburg-Western Pomerania) on the 29th and 30th of November 2023. The measurements were conducted to achieve high-resolution and undisturbed temperature-depth pro-files. The shut-in times since the boreholes were drilled are several decades; the shut-in time since last activities in the boreholes are in the order of 15 years. There-fore, undisturbed formation temperatures can be expected in the boreholes. In the Gt Khn 2/87 borehole, a temperature of 57.8 °C was measured at a depth of 1786.5 m, which corresponds to an average temperature gradient of 27.8 °C/km. The Gt Khn 1/88 borehole could be logged to a depth of 325.1 m and the measured temperature at this depth was 16.2 °C, corresponding to an average geothermal gradient of approx. 23.6 °C/km.
The presented dataset forms the basis for investigating present and future coupled effects of rising surface temperatures and temporal trends in groundwater recharge on subsurface pressure and temperature (PT) conditions in the North German Basin beneath the Federal States of Brandenburg and Berlin (NE Germany), for the period 1955-2100. The study relies on a stochastic weather generator, a distributed hydrologic model, and a 3D thermo-hydraulic groundwater model to evaluate spatio-temporal subsurface feedback to two shared socioeconomic pathways (SSP) for seven general circulation models (GCM). The results demonstrate a regional variability in both the intensity and maximum depths of projected groundwater warming, driven by hydraulic gradients and the underlying geological structure. The magnitude of groundwater warming primarily depends on the surface temperature scenario. Projected changes in recharge are not sufficient to reverse this trend, although recharge is still a key factor controlling groundwater dynamics within aquifers lying above the Rupelian Clay aquitard. The dataset can be further utilized for assessing shallow geothermal potential and groundwater storage availability in the Berlin-Brandenburg region under climate change.
We present a 3-D lithospheric-scale model covering the area of Germany that images the regional structural configuration. The model comprises 31 lithostratigraphic units: seawater, 14 sedimentary units, 14 crystalline crustal units and 2 lithospheric mantle units. The corresponding surfaces are integrated from previous studies of the Central European Basin System, the Upper Rhine Graben and the Molasse Basin, together with published geological and geophysical data. The model is a result of a combined workflow consisting of 3-D structural, gravity and thermal modelling applied to derive the 3-D thermal configuration.The top surface elevations and thicknesses of corresponding layers of the 3-D-D model are provided as ASCII files, one for each individual layer of the model. The columns in each file are identical: the Easting is given in the “X COORD (UTM Zone 32N)”, the Northing is in the “Y COORD (UTM Zone 32N)”, the top surface elevation of each layer is given as "TOP (m.a.s.l)", the thickness of each layer is given as "THICKNESS (m)".
The database help assess the technical feasibility questions for CO2 underground storage in North German Basin and the German North Sea region serving as a reference for “direct air capture and storage for reaching CO2 neutrality” project. The main purpose for this database was to gather uniform geological data information for characterizing depleted hydrocarbon fields and deep saline aquifers, supporting strategic decision making for pilot project to establish a direct air capture and storage demonstrator in Germany. All data collected for the database comes from public domains and therefore making it suitable for preliminary site screening and selection. However, detailed site characterization and further investigation are required for more comprehensive evaluation. For each of the identified storage sites found from previous publication and projects (Höding et al., 2009;Hystories, 2022; Poulsen et al., 2013), 9 parameters were selected for geological characterization for CO2 storage assessment, which are depth and thickness of storage formation, porosity and permeability, estimated storage capacity, caprock thickness, and reservoir integrity, as well as geothermal gradient. The determination of this parameters were generally following the instructions of International Organization for Standardization (2017), the ISO 27914:2017 standard outlines the requirements for carbon dioxide capture, transportation, and geological storage and other publications for site screening and selection instructions (Callas et al., 2022, 2023; Kim et al., 2022; Raza et al., 2016; Uliasz-Misiak et al., 2021), and further carved considering sound scientific approaches, best practice methodologies, availability of high-quality data, and in-situ storage conditions. The geological coordinates have been converted to WGS 84 / UTM zone 33N with QGIS authority projection number as European Petroleum Survey Group (32633). Most geological parameters were extracted based on TUNB model(BGR, LAGB, LBEG, LBGR, LLUR, & LUNG, 2022), additional petrophysical information were mainly collected from Müller & Reinhold, (2011), Reinhold et al., (2011) and Petroleum Geological Atlas of the Southern Permian Basin Area, (2010) projects. Additionally, this database can also serve as a valuable resource for other types of underground storage characterization.
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