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

Authors: T. Lohr, C.M. Krawczyk, D.C. Tanner, R. Samiee, H. Endres, O. Oncken, H. Trappe and P.A. Kukla
Journal name: Basin Research
Issue: Vol 19, No 4, December 2007 pp. 579 - 597
DOI: 10.1111/j.1365-2117.2007.00338.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 3.23Mb )

Summary:
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 importantNW-trending fault zone within the super imposed 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 and (5) major subsidence and salt diapir rise during the Cenozoic. We suggest that the heterogeneity in distribution and timing of deformation in the working areawas 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- and pre- salt units, and is characterised by strike- slip faulting.

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