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Abstract
Chapter from: M
65: Salt Tectonics: A Global Perspective
Edited By
M.P.A. Jackson, D.G. Roberts, and S. SnelsonAuthors:
G. Remmelts Structure, Tectonics, Paleostructure
Published 1995 as
part of Memoir 65
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved |
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Remmelts,
G., 1995, Fault-related salt tectonics in the southern North Sea, The Netherlands,
in
M. P. A. Jackson, D. G. Roberts, and S. Snelson, eds., Salt
tectonics: a global perspective:
AAPG Memoir 65, p. 261-272. |
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Chapter
12
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Fault-Related
Salt Tectonics in the Southern North Sea, The Netherlands |
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G. Remmelts
Rijks Geologische Dienst
Haarlem, The Netherlands |
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Abstract
This chapter describes the
relationship between basement faulting and salt flow in the southern North
Sea in general and in the Dutch Central North Sea Graben area specifically.
The research was executed within a national program on radioactive waste
disposal in The Netherlands and is based on a 2000-km regional two-dimensional
seismic survey.
Salt structures consist of
Upper Permian Zechstein salt. The salt structures are, almost without exception,
related to basement faults. This paper concerns the relative location of
the basement faults and salt structures, the triggering of salt flow, and
the rate of this flow.
The Netherlands sector of
the continental shelf can be subdivided into a number of salt provinces
on the basis of their developmental stage. This subdivision coincides with
the structural units. The maturity of the salt structure is proportional
to the throw of the basement fault. A relationship exists between basement
faulting and increased salt flow, and the interference of fault systems
in the basement is reflected in the geometry of the salt structures. The
effect of basement faulting on salt flow appears to correspond with the
results of previously published physical modeling . The buoyancy force related
to the density inversion alone seems insufficient to pierce the overburden.
Weakening of the overburden and enhancing the buoyancy forces by differential
loading enable the salt to flow and breach the overburden. |
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