Inst. Angewandte Geowissenschaften

123 Items

Recent Submissions
Experimental characterization and simulation of lead surface reactions for application at geothermal conditions

Driba, Dejene Legesse (2019)

Scaling (=mineral precipitation) frequently occurs in geothermal power plants representing a problem for plant operation by reducing the flow-through in pipes or in pores of the reservoir rock. The availability of potential scale forming chemical components within the fluid is among other geochemical reactions largely determined by its distribution at the interface between fluid and rock. There...

On factors controlling the mobility of organic compounds in water-rock interactions

Zhu, Yaling (2019)

The chemistry of organic compounds is based on carbon, the fifteenth most abundant element in the crust. Deriving from mainly biological systems, organic compounds can be incorporated into sedimentary rocks, and remain within the lithosphere for extended geological time periods, undergoing lengthy exposure to elevated temperatures and pressures which results in chemical transformations and phys...

Structural analysis of S-wave seismics around an urban sinkhole: evidence of enhanced dissolution in a strike-slip fault zone

Tanner, David C. ; Wadas, Sonja Halina ; Polom, Ulrich ; Krawcyk, Charlotte M. (2017)

Abstract. In November 2010, a large sinkhole opened up in the urban area of Schmalkalden, Germany. To determine the key factors which benefited the development of this collapse structure and therefore the dissolution, we carried out several shear-wave reflection-seismic profiles around the sinkhole. In the seismic sections we see evidence of the Mesozoic tectonic movement in the form of a NW–SE...

High-resolution shear-wave seismic reflection as a tool to image near-surface subrosion structures – a case study in Bad Frankenhausen, Germany

Wadas, Sonja Halina ; Polom, Ulrich ; Krawcyk, Charlotte M. (2016)

Abstract. Subrosion is the subsurface leaching of soluble rocks that results in the formation of depression and collapse structures. This global phenomenon is a geohazard in urban areas. To study near-surface subrosion structures, four shear-wave seismic reflection profiles, with a total length of ca. 332m, were carried out around the famous leaning church tower of Bad Frankenhausen in northern...

The impact of temperature and oxygen on water-rock interactions in siliciclastic rocks and implications for aquifer thermal energy storage systems

Müller, Daniel Richard (2018)

Water-rock interactions are sorption-, dissolution-, precipitation-, and redox reactions at the interface between rock matrix and water. In aquifer thermal energy storage (ATES) systems, certain water-rock interactions can have undesired consequences, such as clogging of aquifer pores or contaminant release, and are therefore geochemical risks. Their prediction and prevention requires site-spec...

The characterization of water-soluble organic compounds released from organic-rich sediments

Calzada Mendoza, Jacqueline Mireya (2018)

The study of deep biosphere, especially the growth under extreme conditions (e.g. high temperatures and limited substrates), has attracted considerable attention in recent decades. Even under such conditions, water and low molecular weight organic acids (LMWOA) are present. LMWOA play an important role in several biotic and abiotic processes, e.g. in the Krebs cycle used by all aerobic organism...

Water and water shortage Iran

Ghader, Fatemeh (2018-10-22)

Tashk-Bakhtegan and Maharlu lakes' basin in Fars province in the south of Iran is facing a harsh water shortage in recent years. In this study for the first time, a complete research was carried out to understand the hydrologic circle of Tashk-Bakhtegan and Maharlu lakes' basin. In this study those basins were evaluated in terms of meteorology, surface water, groundwater, water quality, and wa...

Water and water shortage in Iran

Ghader, Fatemeh (2018)

Tashk-Bakhtegan and Maharlu lakes' basin in Fars province in the south of Iran is facing a harsh water shortage in recent years. Semi-dry and dry conditions are prevailing climate conditions in the basin and the wet condition can only be seen in the small part of the north. Groundwater is the main source to provide water for different purposes such as agriculture, industry and drinking. Over-ex...

Quantification of cooling effects and water demand of urban facade greenings

Hölscher, Marie-Therese (2018)

Higher air temperatures in cities lead to increased heat stress for the urban population, especially during the night in hot summer periods. Facade greening is often discussed as a promising mitigation strategy as it can be applied on building surfaces where the heat stress is mainly caused. It reduces the stored energy in the building mass through shading and transpirative cooling and addition...

P-T-X phase diagrams of carbonates

Müller, Jan (2018)

This thesis has been devoted to the high pressure (HP) and high temperature (HT) effects on the FeCO3-MgCO3 and the CaCO3-MgCO3 solid solution series. In more detail, I have investigated the vibrational behavior of the FeCO3-MgCO3 solid solution series under HP/HT conditions across the electronic high spin (HS) to low spin (LS) transition up to 60 GPa and 700 K and I have furthermore determined...

Compositional alterations of petroleum as a result of expulsion and migration in the North Sea Central Graben petroleum system

Ziegs, Volker (2018)

The Mandal Formation, the principal source rock in the well-explored North Sea Central Graben, has been identified as a locally very inefficient expeller of its generated products, although having charged numerous petroleum accumulations in that basin. This unusual behaviour for marine shales makes the Mandal Formation an interesting natural laboratory to re-assess the factors controlling gener...

High-resolution shear wave reflection seismics and borehole seismics as tools for the imaging and the characterization of near-surface subrosion structures

Wadas, Sonja Halina (2018)

Subrosion and the resulting structures, such as sinkholes and depressions, pose a great hazard risk. They can cause damage to buildings and infrastructure, and lead to life-threatening situations. But compared to other natural hazards, like earthquakes and tsunamis, very little is known about the generation processes or the possibilities of forecasting. Germany suffers from a widespread sinkhol...

On the frequency-dependence of electrical soil properties and their influence on ground-penetrating radar

Loewer, Markus (2018)

Ground-Penetrating Radar (GPR) is sensitive to changes of electrical soil properties. These properties can become strongly frequency-dependent, even so they are considered constant in many applications. Analysis of radargrams provided evidence that radar waves propagating in moist loamy and clayey soils underlie strong absorption and dispersion effects. The energy absorption together with the w...

Microbial signatures and quality assessment of Siberian permafrost organic matter for future biogenic greenhouse gas production

Stapel, Janina Gabriele (2018)

The Earth´s high latitude regions, where recent warming has been amplified, are of particular concern in the light of future climate change. Annual average temperatures in the Arctic have risen by 0.6 °C per decade over the last 30 years, and this warming trend resulted into the thaw of perennially frozen ground (permafrost), which exposes substantial amounts of previously frozen organic carbon...

Dissolution-precipitation reactions in the system Al2O3-SiO2-H2O and the formation of Al2SiO5

Schultze, Dina (2018)

The study of mineral replacement reactions can provide detailed insight into chemical processes, if experimental simulation and natural observation are combined. Among all chemical systems, the Al2O3-SiO2-H2O is one of the most intensely studied but some of our knowledge about it is still inconsistent. Especially problematic is the inhibited reaction of corundum and quartz to Al2SiO5 polymorphs...

A dataset of housing market and self-attitudestowards housing location choices in Alexandria, Egypt

Ibrahim, Mohamed R. (2017-03-09)

A survey, of sample size 224, is designed to include the different related-factors to housing location choice, such as; socioeconomic factors, housing characteristics, travel behavior, current self-selection factors, housing demand and future location preferences. It comprises 16 questions, categorized into three different sections; socioeconomic (5 Questions), current dwelling unit characteris...

Impact and mitigation of borehole related effects in permanent crosshole resistivity imaging: An example from the Ketzin CO2 storage site

Wagner, Florian M. ; Bergmann, Peter ; Rücker, Carsten ; Wiese, Bernd ; Labitzke, Tim ; Schmidt-Hattenberger, Cornelia ; Maurer, Hansruedi (2015)

Geoelectrical methods are particularly suited for CO2 injection monitoring due to their high sensitivity to fluid displacement processes in porous rock formations. The use of borehole electrodes is favorable for deep storage horizons. Yet data acquisition based on permanently installed borehole electrodes can be challenged by the finite extent of the electrodes, unintended borehole deviation an...

Near‐surface fault detection using high‐resolution shear wave reflection seismics at the CO2CRC Otway Project site, Australia

Beilecke, Thies ; Krawczyk, Charlotte M. ; Ziesch, Jennifer ; Tanner, David C. (2016-07-28)

High‐resolution, near‐surface, shear wave reflection seismic measurements were carried out in November 2013 at the CO2CRC Otway Project site, Victoria, Australia, with the aim to determine whether and, if so, where deeper faults reach the near subsurface. From a previous P wave 3‐D reflection seismic data set that was concentrated on a reservoir at 2 km depth, we can only interpret faults up to...

Copper precipitation as consequence of steel corrosion in a flow-through experiment mimicking a geothermal production well

Regenspurg, Simona ; Geigenmüller, Ives ; Milsch, Harald ; Kühn, Michael (2017)

Decreasing production rates and massive precipitation of native copper (Cu(0)) were observed in the production well at the geothermal research facility Groß Schönebeck (Germany). The Cu precipitates filling up the well are a product of an electrochemical corrosion reaction between dissolved copper (Cu2+, Cu+) in the brine and iron (Fe(0)) of the carbon steel liner. It was hypothesized that this...

Composition, properties, origin and evolutionary pathways of solid bitumens from SE Turkey

Hosseini Baghsangani, Seyed Hossein (2018)

The south-eastern region of Turkey is the most petroliferous region of the country and there are many surface and subsurface hydrocarbon occurrences. In particular, this region is noted for the widespread occurrence of solid bitumen veins and vugs, ostensibly generated from the same source but showing different physicochemical characteristics depending upon their geographic location. Although t...