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Abstract
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Chapter from: SG
42: Applications of 3-D Seismic Data to Exploration and Production
Edited by:
Paul Weimer and Thomas L. David Author:
Joseph A. Cartwright
Published 1996 as
part of Studies in Geology 42
Copyright © 1996 The American Association of Petroleum
Geologists. All Rights Reserved.
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*Editorial Note: Page numbers in this digital version
(HTML and PDF) do not correspond to those of the hardcopy.
Otherwise, the two are the same.
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CHAPTER 25
Chapter 25: Polygonal
Fault Systems: A New Type of Fault Structure Revealed by 3-D Seismic Data
from the North Sea Basin Joseph A. Cartwright*
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Cartwright, J.
A., Polygonal fault systems: a new type of fault structure revealed by
3-D seismic data from the North Sea Basin, in P. Weimer and T. L.
Davis, eds., AAPG Studies in Geology No. 42 and SEG Geophysical
Developments Series No. 5, AAPG/SEG, Tulsa, p. 225-230. |
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ABSTRACT
This paper describes a new
class of fault structure: the polygonal fault system. This complex fault
system is composed of almost randomly oriented minor extensional faults
organized in a polygonal network. The component faults are typically 500-1000
m long and have throws ranging from 10 to 100 m. They are closely spaced
(200-400 m), and fault mapping is possible only with 3-D seismic data.
The polygonal fault system
deforms Lower Tertiary shale sequences over a large part of the North Sea
Basin and is restricted in extent to low-permeability facies in slope and
basin plain regions. The faulted intervals are bounded above and below
by completely undeformed sequences. These key observations are taken to
suggest a genetic model in which the fault system formed through a compaction-related
mechanism. |
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