Multiphase salt tectonic evolution in NW Germany: seismic interpretation and retro-deformation

Mohr, Markus; Kukla, Peter A.; Urai, János L.; Breßer, Georg

doi:10.1007/s00531-005-0498-8

Cited by 21 publications

(44 citation statements)

References 28 publications

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“…Brink et al, 1992;Baldschuhn et al, 1996;Kossow & Krawczyk, 2002;von Hartmann, 2003;Maystrenko etal., 2005). Rare 3D re£ection seismic measurements were carried out on a much smaller scale (von Hartmann, 2003;Mohr et al, 2005). 2D seismic cross-sections are subject to spatial artefacts: the re£ection patterns are a¡ected by marginal e¡ects, the pro¢les do not necessarily run per-pendicular to the strike direction of the structural elements, and section balancing and calculation of material loss are arguable when mobile salt structures are involved.…”

Section: Introductionmentioning

confidence: 96%

Strain partitioning due to salt: insights from interpretation of a 3D seismic data set in the NW German Basin

Lohr

Krawczyk

Tanner³

et al. 2007

Basin Research

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We present results from interpretation of a 3D seismic data set, located within the NW German sedimentary basin, as part of the Southern Permian Basin. We focused on the development of faults, the timing of deformation, the amount of displacement during multiphase deformation, strain partitioning, and the interaction between salt movements and faulting. We recognised the central fault zone of the study area to be the Aller-lineament, an important NW-trending fault zone within the superimposed Central European Basin System.From structural and sedimentological interpretations we derived the following evolution: (1) E-W extension during Permian rifting, (2) N-S extension within cover sediments, and E-W transtension affecting both basement and cover, contemporaneously during Late Triassic and Jurassic, (3) regional subsidence of the Lower Saxony Basin during Late Jurassic/Early Cretaceous, (4) N-S compression within cover sediments, and E-W transpression affecting both basement and cover, contemporaneously during Late Cretaceous/Early Tertiary inversion, (5) major subsidence and salt diapir rise during the Cenozoic.We suggest that the heterogeneity in distribution and timing of deformation in the working area was controlled by pre-existing faults and variations in salt thickness, which led to stress perturbations and therefore local strain partitioning. We observed coupling and decoupling between pre-and post-Zechstein salt units: in decoupled areas deformation occurred only within post-salt units, whereas in coupled areas deformation occurred in both post-salt and pre-salt units, and is characterised by strike-slip faulting.

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Section: Introductionmentioning

confidence: 96%

Strain partitioning due to salt: insights from interpretation of a 3D seismic data set in the NW German Basin

Lohr

Krawczyk

Tanner³

et al. 2007

Basin Research

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“…These faults were apparently weakly developed and did not penetrate the evaporites. Nevertheless, these ductile layers already began moving in Early Triassic times evidenced by studies on the Hunte High (Strunck et al 1998) and in the Ostfriesland area (Mohr et al 2004(Mohr et al , 2005.…”

Section: Discussionmentioning

confidence: 96%

Synsedimentary faults and amalgamated unconformities: Insights from 3D-seismic and core analysis of the Lower Triassic Middle Buntsandstein, Ems Trough, north-western Germany

Radies

Stollhofen

Hollmann³

et al. 2005

Int J Earth Sci (Geol Rundsch)

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The Late Permian/Early Triassic succession of the Central European Basin (CEB) was repeatedly affected by the tectonic pulses associated with the earliest phases of Tethyan and Arctic-North Atlantic rifting. Effects of the differential tectonic subsidence are particularly well recorded by unconformities, which form widespread sequence boundaries. Such unconformities are most obvious in areas occupied by fault-controlled intra-basinal highs (swells). In that areas, stratigraphic loss may comprise entire Lower and Middle Buntsandstein formations and in places remnant Middle Buntsandstein successions directly rest on Permian strata. Analysis of 3D-seismic data and well logs combined with high-resolution sedimentological logging of drillcores at the western margin of the Ems Trough (NW Germany) reveals details of synsedimentary tectonic control on sequence development. Early Triassic extensional faulting of basement blocks provided stepwise addition of accommodation space for continental sequences by growth faulting along north-south oriented fault zones blocks on the flanks of the East Netherlands High. This process is most evident during the development of the Hardegsen Unconformity, which is characterised by an amalgamation of succeeding unconformity surfaces in areas of structurally controlled intrabasinal highs.

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“…It is important to stress that in this work the objective is not to gain geological insight on the region; the simplified section is used to show the capabilities of the numerical techniques presented so far. Panels (a) and (b) of Figure 5 show seismic data and the geological interpretation provided by [24] (modified from their Figure 6). Examples of well-resolved contacts (interfaces that can be univocally located based on the seismic data) and poorly resolved features were added to their Figure. Label 3 and 4 show two poorly resolved features: the smoothness of the lateral contact of the salt body with surrounding rocks and the thickness of the salt layer that crosses the section.…”

Section: Temperature Field In a Geological Cross-sectionmentioning

confidence: 99%

Proper generalized decomposition of a geometrically parametrized heat problem with geophysical applications

Zlotnik

Dı́ez

Modesto

et al. 2015

Numerical Meth Engineering

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SUMMARYThe solution of a steady thermal multiphase problem is assumed to be dependent on a set of parameters describing the geometry of the domain, the internal interfaces and the material properties. These parameters are considered as new independent variables. The problem is therefore stated in a multidimensional setup. The Proper Generalized Decomposition (PGD) provides an approximation scheme especially well suited to preclude dramatically increasing the computational complexity with the number of dimensions. The PGD strategy is reviewed for the standard case dealing only with material parameters. Then, the ideas presented in [Ammar et al., "Parametric solutions involving geometry: A step towards efficient shape optimization." Comput. Methods Appl. Mech. Eng., 2014; 268:178-193] to deal with parameters describing the domain geometry are adapted to a more general case including parametrization of the location of internal interfaces. Finally, the formulation is extended to combine the two types of parameters. The proposed strategy is used to solve a problem in applied geophysics studying the temperature field in a cross section of the Earth crust subsurface. The resulting problem is in a 10-dimensional space, but the PGD solution provides a fairly accurate approximation (error  1%) using less that 150 terms in the PGD expansion.

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Multiphase salt tectonic evolution in NW Germany: seismic interpretation and retro-deformation

Cited by 21 publications

References 28 publications

Strain partitioning due to salt: insights from interpretation of a 3D seismic data set in the NW German Basin

Strain partitioning due to salt: insights from interpretation of a 3D seismic data set in the NW German Basin

Synsedimentary faults and amalgamated unconformities: Insights from 3D-seismic and core analysis of the Lower Triassic Middle Buntsandstein, Ems Trough, north-western Germany

Proper generalized decomposition of a geometrically parametrized heat problem with geophysical applications

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