Abstract
In several areas of the North German Basin, saline water comes close to, or even reaches the surface. Available data from wells indicate that brine stratification is under unstable conditions in the deeper underground. In order to analyse the possible transport mechanisms, 3D thermohaline simulations have been carried out for two different scenarios. The 3D regional model (230×330 km) indicates that salty water is driven to the surface by hydrostatical forces from the surrounding highlands. In addition, a smaller scale model (10×10 km) has been constructed with a grid resolution accounting for possible convective flow. The results indicate that convective flow may play a dominant role in areas with minor topography. In summary, the complex pattern of near surface occurrences of saline water probably results from the interaction of hydrostatic and thermal forces.
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References
Bayer U, Magri F, Clausnitzer V, Jahnke C, Fuhramnn J, Moller P, Pekdeger A, Tesmer M, Voigt H (2005) Deep reaching fluid flow close to convective instability in the NE German Basin. Techtonophysics (in press)
Bear J (1991) Modelling transport phenomena in porous media. Convect Heat Mass Transfer Porous Media 7:69
Grube A, Wichman K, Hahn J, Nachtigall K (2000) Geogene Grundwasserversalzung in den Porengrundwasserleitern Norddeutschlands und ihre Bedeutung für die Wasserwirtschaft. Technologiezentrum Wasser Karlsruhe (TZW), Karlsruhe, pp 1–203
Hurtig (1994) Land Brandenburg. Bohrungen mit kontinuierlichen Bohrlochmessungen. Bohrungen mit Maximaltemperaturen. Unveröff. Unterlagen bereitgestellt durch das Landesamt für Geowissenschaften und Rohstoffe Brandenburg
Kolditz O, Ratke R, Diersch H J G, Zielke W (1998) Coupled groundwater flow and transport: 1. Verification of variable density flow and transport models. Adv Water Resources 21:27–46
Magri F (2004) Derivation of the coefficients of thermal expansion and compressibility for use in FEFLOW. WASY White papers III:13–23
Nield DA (1968) Onset of thermohaline convection in a porous medium. Water Resources Res 4:553–560
Nield D A (1974) Comments on Effect of solute dispersion on thermal convection in a porous medium layer. Water Resources Res 10:889
Nield DA, Bejan A (1999) Convection in porous media. Springer, Berlin Heidelberg New York, pp 1–546
Oldenburg CM, Pruess K (1998) Layered thermohaline convection in hypersaline geothermal systems. Transport Porous Media 33: 29–63
Oldenburg CM, Pruess K (1999) Plume separation by transient thermohaline convection in porous media. Geophy Res Lett 26:2997–3000
Person M, Raffensperger JP, Ge S, Garven G (1996) Basin-scale hydrogeologic modeling. Rev Geophys 34:61–87
Ranganathan V, Hanor JS (1988) Density-driven groundwater flow near salt domes. Chem Geol 74:173–188
Rosenberg ND, Spera FJ (1990) Role of anisotropic and/or layered permeability in hydrothermal convection. Geophys Res Lett 17:235–238
Rosenberg ND, Spera FJ (1992a) Convection in porous media with thermal and chimical buoyancy: a comparison of two models for solute dispersion. Chaotic processes in the geological science IMA volume in mathematics and its applications, pp 319–333
Rosenberg ND, Spera FJ (1992b) Thermohaline convection in a porous medium heated from below. Int J Heat Mass Transfer 35:1261–1273
Rubin H (1975) Effect of solute dispersion on thermal convection in a porous medium layer. Water Resources Res 11:154–158
Sarkar A, Nunn JA, Hanor JS (1995) Free thermohaline convection beneath allochthonous salt sheets: an agent for salt dissolution and fluid flow in Gulf Coast sediments. J Geophys Res 100:18085–18092
Scheck M (1997) Dreidimensional Strukturmodellierung des Nordostdeutschen Beckens unter Einbeziehung von Krustenmodellen Scientific Technical Report STR97/10. Geoforschungszentrum, Potsdam
Scheck M, Bayer U (1999) Evolution of the Northeast German Basin—inferences from a 3D structural model and subsidence analysis. Tectonophysics 313:145–169
Schirrmeister W (1996) Aus der Literatur überlieferte Angaben über natürliche Salzwasseraustritte an der Grundwasseroberfläche/Geländeoberfläche in Brandenburg. Brandenburgische Geowissenschaftliche Beiträge 3:94–96
Sorey ML (1976) Numerical modeling of liquid geothermal systems. USGS Open File Report 75–613
Straus JM, Schubert G (1977) Thermal convection of water in a porous medium: effects of temperature and pressure dependent thermodynamic and transport properties. J Geophys Res 82:325–333
Wood JR, Hewett TA (1982) Fluid convection and mass transfer in porous sandstones - a theoretical model. Geochim Cosmochim Acta 46:1707–1713
Acknowledgements
This project is supported by the German Science Foundation (DFG) as part of the SPP 1135 “Dynamics of Sedimentary Systems under varying Stress Conditions by Example of the Central European Basin System”. The geological data have been provided by M. Scheck-Wenderoth. We acknowledge Prof. Diersch and Dr. Clausnitzer at WASY Berlin, for providing support in FEFLOW. We also thank the Deep Fluid Flow Working group for discussions and two anonymous reviewers for their help in improving the manuscript.
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Magri, F., Bayer, U., Jahnke, C. et al. Fluid-dynamics driving saline water in the North East German Basin. Int J Earth Sci (Geol Rundsch) 94, 1056–1069 (2005). https://doi.org/10.1007/s00531-005-0497-9
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DOI: https://doi.org/10.1007/s00531-005-0497-9