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Abstract
Chapter from: M
64: Sequence Stratigraphy of Foreland Basin Deposits
Edited By
J.C. Van Wagoner and G.T. BertramAuthors:
N.J. Milton and G.T. Bertram Seismic/Sequence Stratigraphy
Published 1995 as
part of Memoir 64
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved.
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Chapter 1
*
Topset Play
Types and Their Controls
N. J. Milton
G. T. Bertram1
BP Exploration
Forus, Norway
*
ABSTRACT
Cycles of progradation and retrogradation
of a basin-margin system of topsets and clinoforms are controlled by the
balance between sediment supply rate and the rate of creation of topset
accommodation volume. The latter is defined as the product of the topset
area and the rate of rise of relative sea level. If the system is graded,
with sand preferentially trapped in the proximal part of the system, i.e.,
the topsets, then the topset sand percentage is controlled by the rate
of sand supply and the rate of creation of topset accommodation volume.
The topsets of systems tracts with a high topset volume will be relatively
less sandy than those with a low topset volume, and topset sand percentage
will vary in a systematic manner within a sequence.
The play types associated with the topsets
are strongly influenced by the relative abundance in the topsets of reservoir
and seal. Different types of basins are characterized by different topset
play types.
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