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3D seismic study of complex intra-salt deformation: An example from the Upper Permian Zechstein 3 stringer, western Dutch offshore

By
F. Strozyk
F. Strozyk
Structural Geology, Tectonics and Geomechanics, RWTH Aachen University, Lochnerstraße 4-20, Haus A, D-52056 Aachen, GermanyGeological Institute, RWTH Aachen University, Wüllnerstraße 2, D-52056 Aachen, Germany
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H. Van Gent
H. Van Gent
Geological Institute, RWTH Aachen University, Wüllnerstraße 2, D-52056 Aachen, Germany
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J. L. Urai
J. L. Urai
Geological Institute, RWTH Aachen University, Wüllnerstraße 2, D-52056 Aachen, Germany
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P. A. Kukla
P. A. Kukla
Structural Geology, Tectonics and Geomechanics, RWTH Aachen University, Lochnerstraße 4-20, Haus A, D-52056 Aachen, Germany
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Published:
January 01, 2012

Abstract

Most of the information on subsurface evaporitic structures comes from 3D seismic data. However, this data only provide limited information about the internal structure of the evaporites, which is known from salt mines and salt diapir outcrops. Brittle intra-salt layers (carbonate, anhydrite, clay) of at least 10 m thickness form good reflectors in evaporites, but the structure and dynamics of such ‘stringers’ in the salt movement are poorly understood. In this study, we investigate the intra-salt Zechstein 3 (Z3) stringer from 3D seismic data in an area offshore the Netherlands. Observations show complex deformation including boudinage, folding and stacking. Reflections from thin and steep stringer parts are strongly reduced, and we present different structural models and tests of these. We compare our observations to structural models from salt mines and analogue/numerical models of intra-salt deformation. A smoothed representation of the upper surface of the stringer fragments follows the shape of Top Salt, but smaller-scale stringer geometries strongly differ from this and imply boudinage. The imaged disharmonic patterns of constrictional folds provide evidence for the complexity of the intra-salt, in agreement with observations in salt mines. This may be explained by interaction of the layered salt rheology, complex three-dimensional salt flow, different phases and styles of basement tectonics and movement of the overburden.

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Contents

Geological Society, London, Special Publications

Salt Tectonics, Sediments and Prospectivity

G. I. Alsop
G. I. Alsop
University of Aberdeen, UK
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S. G. Archer
S. G. Archer
University of Aberdeen, UK
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A. J. Hartley
A. J. Hartley
University of Aberdeen, UK
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N. T. Grant
N. T. Grant
ConocoPhillips UK Ltd, Aberdeen, UK
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R. Hodgkinson
R. Hodgkinson
Bowleven plc, Edinburgh, UK
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Geological Society of London
Volume
363
ISBN electronic:
9781862396111
Publication date:
January 01, 2012

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