Deep reaching fluid flow in the North East German Basin: origin and processes of groundwater salinisation

Tesmer, Maja; Möller, P.; Wieland, S.; Jahnke, Christoph; Voigt, Hans-Jürgen; Pekdeger, A.

doi:10.1007/s10040-007-0176-y

Cited by 46 publications

(49 citation statements)

References 47 publications

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“…In particular, observed processes confirm hypothesizes suggested by previous hydrochemical studies [Tesmer et al, 2007;Möller et al, 2008]. The results corroborate major conclusions derived by previous two-dimensional numerical simulations , at the same time providing insights in novel aspects of the hydrodynamics of the system.…”

Section: Discussionsupporting

confidence: 90%

“…These hydrogeological windows are manifested either by locations where the Rupelian Aquitard was primarily not deposited or was removed after its deposition by erosional Quaternary channels filled with highly permeable glacial deposits. Interaquifer hydraulic connections were suggested by previous hydrochemical studies performed for different areas in the basin [Tesmer et al, 2007 andMöller et al, 2008]. Based on an analysis of stable H and O isotopes and pattern of rare-earth elements and yttrium (REY), these studied convey that across-aquifer flow must exist in areas where the Rupelian Aquitard is missing.…”

Section: Introductionmentioning

confidence: 93%

See 1 more Smart Citation

Quaternary channels within the Northeast German Basin and their relevance on double diffusive convective transport processes: Constraints from 3‐D thermohaline numerical simulations

Cacace

Scheck‐Wenderoth

2013

Geochem Geophys Geosyst

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 93%

Quaternary channels within the Northeast German Basin and their relevance on double diffusive convective transport processes: Constraints from 3‐D thermohaline numerical simulations

Cacace

Scheck‐Wenderoth

2013

Geochem Geophys Geosyst

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“…Fluid , HI values and PNG data processing 3.1. Fluid  and HI values Similar to many brines from the North German Basin at corresponding depth (Tesmer et al, 2007), the Ketzin brine is dominated by NaCl. This allows for a common assumption made in PNG interpretation (e.g.…”

Section: Well Completionsmentioning

confidence: 93%

Monitoring of saturation changes and salt precipitation during CO2 injection using pulsed neutron-gamma logging at the Ketzin pilot site

Baumann

Henninges

Lucia

2014

International Journal of Greenhouse Gas Control

106

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During injection of CO 2 , monitoring of the subsurface saturation changes is required. For well logging in cased boreholes only a limited number of techniques such as radiometric pulsed neutron-gamma (PNG) logging are applicable. The conventional PNG saturation model mainly considers a displacement process. But during CO 2 injection additional processes such as evaporation and salt precipitation are expected to occur as a result of the mutual solubility between brine and CO 2 . For this purpose an extended PNG saturation model for NaCl-brines is developed and applied to a timelapse PNG monitoring data set from the Ketzin site. The results show that for the observation well further away from the injection well, the conventional displacement saturation model is valid, with average CO 2 saturations below 60 %. In contrast, the data from the injection well shows that both evaporation and salt precipitation have occurred. Here, the largest CO 2 saturations with values up to 100 % are determined locally. The results of the extended saturation model indicate that dry-out regions, where only CO 2 and halite with saturations up to 1.4 % exist, and maximum halite saturations up to 14.1 % occur in the vicinity of the brine levels. The halite saturation distribution in the injection well seems to be controlled by changes in the injection regime associated with changing brine levels, lithological heterogeneities, and capillary effects. PNG monitoring in combination with the extended saturation model is suited to determine displacement and evaporation/precipitation processes for CO 2 storage operations.

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“…Below this layer, there is a gradient in salinity (and density). In parts that are not directly influenced by salt domes, the correlation is estimated between (Müller and Papendieck 1975;Klinge 1991;Magri et al 2005;Tesmer et al 2007;Wolfgramm et al 2011):…”

Section: Hydrogeological Settingmentioning

confidence: 99%

Numerical modeling of fracking fluid migration through fault zones and fractures in the North German Basin

2016

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Gas production from shale formations by hydraulic fracturing has raised concerns about the effects on the quality of fresh groundwater. The migration of injected fracking fluids towards the surface was investigated in the North German Basin, based on the known standard lithology. This included cases with natural preferential pathways such as permeable fault zones and fracture networks. Conservative assumptions were applied in the simulation of flow and mass transport triggered by a high pressure boundary of up to 50 MPa excess pressure. The results show no significant fluid migration for a case with undisturbed cap rocks and a maximum of 41 m vertical transport within a permeable fault zone during the pressurization. Open fractures, if present, strongly control the flow field and migration; here vertical transport of fracking fluids reaches up to 200 m during hydraulic fracturing simulation. Long-term transport of the injected water was simulated for 300 years. The fracking fluid rises vertically within the fault zone up to 485 m due to buoyancy. Progressively, it is transported horizontally into sandstone layers, following the natural groundwater flow direction. In the long-term, the injected fluids are diluted to minor concentrations. Despite the presence of permeable pathways, the injected fracking fluids in the reported model did not reach near-surface aquifers, either during the hydraulic fracturing or in the long term. Therefore, the probability of impacts on shallow groundwater by the rise of fracking fluids from a deep shale-gas formation through the geological underground to the surface is small.

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Deep reaching fluid flow in the North East German Basin: origin and processes of groundwater salinisation

Cited by 46 publications

References 47 publications

Quaternary channels within the Northeast German Basin and their relevance on double diffusive convective transport processes: Constraints from 3‐D thermohaline numerical simulations

Quaternary channels within the Northeast German Basin and their relevance on double diffusive convective transport processes: Constraints from 3‐D thermohaline numerical simulations

Monitoring of saturation changes and salt precipitation during CO2 injection using pulsed neutron-gamma logging at the Ketzin pilot site

Numerical modeling of fracking fluid migration through fault zones and fractures in the North German Basin

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